Wikipedia

Order of operations

(Redirected fromPEMDAS)
Not to be confused withOperations order.

Inmathematicsandcomputer programming,theorder of operationsis a collection of rules that reflect conventions about which operations to perform first in order to evaluate a givenmathematical expression.

Order of operations

These rules are formalized with a ranking of the operations. The rank of an operation is called itsprecedence,and an operation with ahigherprecedence is performed before operations withlowerprecedence.Calculatorsgenerally perform operations with the same precedence from left to right,[1]but someprogramming languagesand calculators adopt different conventions.

For example, multiplication is granted a higher precedence than addition, and it has been this way since the introduction of modernalgebraic notation.[2][3]Thus, in the expression1 + 2 × 3,the multiplication is performed before addition, and the expression has the value1 + (2 × 3) = 7,and not(1 + 2) × 3 = 9.When exponents were introduced in the 16th and 17th centuries, they were given precedence over both addition and multiplication and placed as a superscript to the right of their base.[2]Thus3 + 52= 28and3 × 52= 75.

These conventions exist to avoid notationalambiguitywhile allowing notation to remain brief.[4]Where it is desired to override the precedence conventions, or even simply to emphasize them,parentheses( ) can be used. For example,(2 + 3) × 4 = 20forces addition to precede multiplication, while(3 + 5)2= 64forces addition to precedeexponentiation.If multiple pairs of parentheses are required in a mathematical expression (such as in the case of nested parentheses), the parentheses may be replaced by other types ofbracketsto avoid confusion, as in[2 × (3 + 4)] − 5 = 9.

These rules are meaningful only when the usual notation (calledinfix notation) is used. WhenfunctionalorPolish notationare used for all operations, the order of operations results from the notation itself.

Conventional order

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The order of operations, that is, the order in which the operations in an expression are usually performed, results from a convention adopted throughout mathematics, science, technology and many computerprogramming languages.It is summarized as:[2][5]

  1. Parentheses
  2. Exponentiation
  3. Multiplicationanddivision
  4. Additionandsubtraction

This means that to evaluate an expression, one first evaluates any sub-expression inside parentheses, working inside to outside if there is more than one set. Whether inside parenthesis or not, the operation that is higher in the above list should be applied first. Operations of the same precedence are conventionally evaluated from left to right.

If each division is replaced with multiplication by thereciprocal(multiplicative inverse) then theassociativeandcommutativelaws of multiplication allow the factors in eachtermto be multiplied together in any order. Sometimes multiplication and division are given equal precedence, or sometimes multiplication is given higher precedence than division; see§ Mixed division and multiplicationbelow. If each subtraction is replaced with addition of theopposite(additive inverse), then the associative and commutative laws of addition allow terms to be added in any order.

Theradical symbol√ is traditionally extended by a bar (calledvinculum) over the radicand (this avoids the need for parentheses around the radicand). Other functions use parentheses around the input to avoid ambiguity.[6][7][a]The parentheses can be omitted if the input is a single numerical variable or constant,[2]as in the case ofsinx= sin(x)andsin π = sin(π).[a]Traditionally this convention extends tomonomials;thus,sin 3x= sin(3x)and evensin⁠1/2⁠xy= sin(xy/2),butsinx+y= sin(x) +y,becausex+yis not a monomial. However, this convention is not universally understood, and some authors prefer explicit parentheses.[b]Some calculators and programming languages require parentheses around function inputs, some do not.

Symbols of groupingcan be used to override the usual order of operations.[2]Grouped symbols can be treated as a single expression.[2]Symbols of grouping can be removed using the associative anddistributivelaws, also they can be removed if the expression inside the symbol of grouping is sufficiently simplified so no ambiguity results from their removal.

Examples

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Multiplication before addition:

Parenthetical subexpressions are evaluated first:

Exponentiation before multiplication, multiplication before subtraction:

When an expression is written as a superscript, the superscript is considered to be grouped by its position above its base:

The operand of a root symbol is determined by the overbar:

A horizontal fractional line also acts as a symbol of grouping:

Parentheses can be nested, and should be evaluated from the inside outward. For legibility, outer parentheses can be made larger than inner parentheses. Alternately, other grouping symbols, such as curly braces{} or square brackets[ ],are sometimes used along with parentheses( ).For example:

Special cases

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Unary minus sign

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There are differing conventions concerning theunary operation'−'(usually pronounced "minus" ). In written or printed mathematics, the expression −32is interpreted to mean−(32) = −9.[2][8]

In some applications and programming languages, notablyMicrosoft Excel,PlanMaker(and other spreadsheet applications) andthe programming language bc,unary operations have a higher priority than binary operations, that is, the unary minus has higher precedence than exponentiation, so in those languages −32will be interpreted as(−3)2= 9.[9]This does not apply to the binary minusoperation '−';for example in Microsoft Excel while the formulas=-2^2,=-(2)^2and=0+-2^2return 4, the formulas=0-2^2and=-(2^2)return −4.

Mixed division and multiplication

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There is no universal convention for interpreting an expression containing both division denoted by '÷' and multiplication denoted by '×'. Proposed conventions include assigning the operations equal precedence and evaluating them from left to right, or equivalently treating division as multiplication by the reciprocal and then evaluating in any order;[10]evaluating all multiplications first followed by divisions from left to right; or eschewing such expressions and instead always disambiguating them by explicit parentheses.[11]

Beyond primary education, the symbol '÷' for division is seldom used, but is replaced by the use ofalgebraic fractions,[12]typically written vertically with the numerator stacked above the denominator – which makes grouping explicit and unambiguous – but sometimes written inline using theslashor solidus symbol, '/'.[13]

Multiplication denoted by juxtaposition (also known asimplied multiplication) creates a visual unit and has higher precedence than most other operations. In academic literature, when inline fractions are combined with implied multiplication without explicit parentheses, the multiplication is conventionally interpreted as having higher precedence than division, so that e.g.1 / 2nis interpreted to mean1 / (2 · n)rather than(1 / 2) · n.[2][10][14][15]For instance, the manuscript submission instructions for thePhysical Reviewjournals directly state that multiplication has precedence over division,[16]and this is also the convention observed in physics textbooks such as theCourse of Theoretical PhysicsbyLandauandLifshitz[c]and mathematics textbooks such asConcrete MathematicsbyGraham,Knuth,andPatashnik.[17]However, some authors recommend against expressions such asa / bc,preferring the explicit use of parenthesisa / (bc).[3]

More complicated cases are more ambiguous. For instance, the notation1 / 2π(a + b)could plausibly mean either 1 / [2π · (a + b)]or[1 / (2π)] · (a + b).[18]Sometimes interpretation depends on context. ThePhysical Reviewsubmission instructions recommend against expressions of the forma / b / c;more explicit expressions(a / b) / cora / (b / c)are unambiguous.[16]

6÷2(1+2) is interpreted as 6÷(2×(1+2)) by afx-82MS(upper), and (6÷2)×(1+2) by aTI-83 Pluscalculator (lower), respectively.

This ambiguity has been the subject ofInternet memessuch as "8 ÷ 2(2 + 2)",for which there are two conflicting interpretations: 8 ÷ [2 · (2 + 2)] = 1 and (8 ÷ 2) · (2 + 2) = 16.[15][19]Mathematics education researcher Hung-Hsi Wu points out that "one never gets a computation of this type in real life", and calls such contrived examples "a kind of Gotcha! parlor game designed to trap an unsuspecting person by phrasing it in terms of a set of unreasonably convoluted rules."[12]

Serial exponentiation

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Ifexponentiationis indicated by stacked symbols using superscript notation, the usual rule is to work from the top down:[2][7]

abc=a(bc)

which typically is not equal to (ab)c.This convention is useful because there isa property of exponentiationthat (ab)c=abc,so it's unnecessary to use serial exponentiation for this.

However, when exponentiation is represented by an explicit symbol such as acaret(^) orarrow(↑), there is no common standard. For example,Microsoft Exceland computation programming languageMATLABevaluatea^b^cas (ab)c,butGoogle SearchandWolfram Alphaasa(bc).Thus4^3^2is evaluated to 4,096 in the first case and to 262,144 in the second case.

Mnemonics

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Mnemonicacronyms are often taught in primary schools to help students remember the order of operations.[20][21]The acronymPEMDAS,which stands forParentheses,Exponents,Multiplication/Division,Addition/Subtraction,[22]is common in theUnited States[23]and France.[24]Sometimes the letters are expanded into words of a mnemonic sentence such as "Please Excuse My Dear Aunt Sally".[25]The United Kingdom and otherCommonwealthcountries may useBODMAS(or sometimesBOMDAS), standing forBrackets,Of,Division/Multiplication,Addition/Subtraction, with "of" meaning fraction multiplication.[26][27]Sometimes theOis instead expanded asOrder, meaning exponent or root,[27][28]or replaced byIforIndices in the alternative mnemonicBIDMAS.[27][29]In Canada and New ZealandBEDMASis common.[30]

In Germany, the convention is simply taught asPunktrechnung vor Strichrechnung,"dot operations before line operations" referring to the graphical shapes of the taught operator signsU+00B7·MIDDLE DOT(multiplication),U+2236∶RATIO(division), andU+002B+PLUS SIGN(addition),U+2212−MINUS SIGN(subtraction).

These mnemonics may be misleading when written this way.[25]For example, misinterpreting any of the above rules to mean "addition first, subtraction afterward" would incorrectly evaluate the expression[25]as,while the correct evaluation is.These values are different when.

Mnemonic acronyms have been criticized for not developing a conceptual understanding of the order of operations, and not addressing student questions about its purpose or flexibility.[31][32]Students learning the order of operations via mnemonic acronyms routinely make mistakes,[33]as do some pre-service teachers.[34]Even when students correctly learn the acronym, a disproportionate focus on memorization of trivia crowds out substantive mathematical content.[12]The acronym's procedural application does not match experts' intuitive understanding of mathematical notation: mathematical notation indicates groupings in ways other than parentheses or brackets and a mathematical expression is atree-like hierarchyrather than a linearly "ordered" structure; furthermore, there is no single order by which mathematical expressions must be simplified or evaluated and no universal canonical simplification for any particular expression, and experts fluently apply valid transformations and substitutions in whatever order is convenient, so learning a rigid procedure can lead students to a misleading and limiting understanding of mathematical notation.[35]

Calculators

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Main article:Calculator input methods

Different calculators follow different orders of operations.[2]Many simple calculators without astackimplementchain input,working in button-press order without any priority given to different operations, give a different result from that given by more sophisticated calculators. For example, on a simple calculator, typing1 + 2 × 3 =yields 9, while a more sophisticated calculator will use a more standard priority, so typing1 + 2 × 3 =yields 7.

Calculators may associate exponents to the left or to the right. For example, the expressiona^b^cis interpreted asa(bc)on theTI-92and theTI-30XS MultiViewin "Mathprint mode", whereas it is interpreted as (ab)con theTI-30XIIand the TI-30XS MultiView in "Classic mode".

An expression like1/2xis interpreted as 1/(2x) byTI-82,[3]as well as many modernCasiocalculators[36](configurable on some like thefx-9750GIII), but as (1/2)xbyTI-83and every other TI calculator released since 1996,[37][3]as well as by allHewlett-Packardcalculators with algebraic notation. While the first interpretation may be expected by some users due to the nature ofimplied multiplication,[38]the latter is more in line with the rule that multiplication and division are of equal precedence.[3]

When the user is unsure how a calculator will interpret an expression, parentheses can be used to remove the ambiguity.[3]

Order of operations arose due to the adaptation ofinfix notationinstandard mathematical notation,which can be notationally ambiguous without such conventions, as opposed topostfix notationorprefix notation,which do not need orders of operations.[39][40]Hence, calculators utilizingReverse Polish notation(RPN) using astackto enter expressions in the correct order of precedence do not need parentheses or any possibly model-specific order of execution.[25][22]

Programming languages

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Mostprogramming languagesuse precedence levels that conform to the order commonly used in mathematics,[41]though others, such asAPL,Smalltalk,OccamandMary,have nooperatorprecedence rules (in APL, evaluation is strictly right to left; in Smalltalk, it is strictly left to right).

Furthermore, because many operators are not associative, the order within any single level is usually defined by grouping left to right so that16/4/4is interpreted as(16/4)/4 = 1rather than16/(4/4) = 16;such operators are referred to as "left associative". Exceptions exist; for example, languages with operators corresponding to theconsoperation on lists usually make them group right to left ( "right associative" ), e.g. inHaskell,1:2:3:4:[] == 1:(2:(3:(4:[]))) == [1,2,3,4].

Dennis Ritchie,creator of theC language,said of the precedence in C (shared by programming languages that borrow those rules from C, for example,C++,PerlandPHP) that it would have been preferable to move thebitwise operatorsabove thecomparison operators.[42]Many programmers have become accustomed to this order, but more recent popular languages likePython[43]andRuby[44]do have this order reversed. The relative precedence levels of operators found in many C-style languages are as follows:

1 ()[]->.:: Function call, scope, array/member access
2 !~-+*&sizeoftype cast++-- (most) unary operators,sizeofandtype casts(right to left)
3 */%MOD Multiplication, division,modulo
4 +- Addition and subtraction
5 <<>> Bitwise shift left and right
6 <<=>>= Comparisons: less-than and greater-than
7 ==!= Comparisons: equal and not equal
8 & Bitwise AND
9 ^ Bitwise exclusive OR (XOR)
10 | Bitwise inclusive (normal) OR
11 && Logical AND
12 || Logical OR
13 ?: Conditional expression (ternary)
14 =+=-=*=/=%=&=|=^=<<=>>= Assignment operators (right to left)
15 , Comma operator
Simplifiedformal grammarfor arithmetical expressions in a programming language(left),[45]and derivation of the example expression(a+b)^2/2(right).The latter corresponds to a hierarchical structure ( "syntax tree") which is unique for the given expression. Thecompilergeneratesmachine codefrom the tree in such a way that operations originating at the lowest hierarchy level are executed first.

Examples:

  • !A +!Bis interpreted as(!A) + (!B)
  • ++A +!Bis interpreted as(++A) + (!B)
  • A + B * Cis interpreted asA + (B * C)
  • A || B && Cis interpreted asA || (B && C)
  • A && B == Cis interpreted asA && (B == C)
  • A & B == Cis interpreted asA & (B == C)

(InPython,Ruby,PARI/GPand other popular languages,A & B == Cis interpreted as(A & B) == C.)

Source-to-source compilersthat compile to multiple languages need to explicitly deal with the issue of different order of operations across languages.Haxefor example standardizes the order and enforces it by inserting brackets where it is appropriate.

The accuracy of software developer knowledge about binary operator precedence has been found to closely follow their frequency of occurrence in source code.[46]

History

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The Order of Operations emerged progressively over centuries. The rule that multiplication has precedence over addition was incorporated into the development ofalgebraic notationin the 1600s, since the distributive property implies this as a natural hierarchy. As recently as the 1920s, the historian of mathematics, Florian Cajori, identifies disagreement about whether multiplication should have precedence over division, or whether they should be treated equally. The term "order of operations" and the "PEMDAS/BEDMAS" mnemonics were formalized only in the late 19th or early 20th century, as demand for standardized textbooks grew. Ambiguity about issues such as whether implicit multiplication takes precedence over explicit multiplication and division in such expressions as a/2b, which could be interpreted as a/(2b) or (a/2)*b, imply that the conventions are not yet completely stable.[47][48]

See also

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Notes

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  1. ^abSome authors deliberately avoid any omission of parentheses with functions even in the case of single numerical variable or constant arguments (i.e.Oldham inAtlas), whereas other authors (likeNIST) apply this notational simplification only conditionally in conjunction with specific multi-character function names (likesin), but don't use it with generic function names (likef).
  2. ^To avoid any ambiguity, this notational simplification formonomialsis deliberately avoided in works such asOldham'sAtlas of Functionsor theNIST Handbook of Mathematical Functions.
  3. ^For example, the third edition ofMechanicsbyLandau and Lifshitzcontains expressions such ashPz/2π(p. 22), and the first volume of theFeynman Lecturescontains expressions such as 1/2√N(p. 6–7).In both books, these expressions are written with the convention that thesolidusis evaluated last.

References

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  1. ^"Calculation operators and precedence: Excel".Microsoft Support.Microsoft.2023.Retrieved2023-09-17.
  2. ^abcdefghijBronstein, Ilja Nikolaevič;Semendjajew, Konstantin Adolfovič(1987) [1945]. "2.4.1.1. Definition arithmetischer Ausdrücke" [Definition of arithmetic expressions]. In Grosche, Günter; Ziegler, Viktor; Ziegler, Dorothea (eds.).Taschenbuch der Mathematik[Pocketbook of mathematics] (in German). Vol. 1. Translated by Ziegler, Viktor (23rd ed.). Thun, Switzerland:Harri Deutsch.pp. 115–120, 802.ISBN3-87144-492-8.Regel 7: IstF(A) Teilzeichenreihe eines arithmetischen Ausdrucks oder einer seiner Abkürzungen undFeine Funktionenkonstante undAeine Zahlenvariable oder Zahlenkonstante, so darfF Adafür geschrieben werden. [Darüber hinaus ist noch die AbkürzungFn(A) für (F(A))nüblich. Dabei kannFsowohl Funktionenkonstante als auch Funktionenvariable sein.]
  3. ^abcdef Peterson, Dave (September–October 2019).The Math Doctors(blog). Order of Operations:"Why?";"Why These Rules?";"Subtle Distinctions";"Fractions, Evaluating, and Simplifying";"Implicit Multiplication?";"Historical Caveats".Retrieved 2024-02-11.
    Peterson, Dave (August–September 2023).The Math Doctors(blog). Implied Multiplication:"Not as Bad as You Think";"Is There a Standard?";"You Can't Prove It".Retrieved 2024-02-11.
  4. ^Swokowski, Earl William (1978).Fundamentals of Algebra and Trigonometry(4 ed.). Boston: Prindle, Weber & Schmidt.ISBN0-87150-252-6.p. 1:Thelanguage of algebra[...] may be used as shorthand, to abbreviate and simplify long or complicated statements.
  5. ^Weisstein, Eric Wolfgang."Precedence".MathWorld.Retrieved2020-08-22.
  6. ^Oldham, Keith B.; Myland, Jan C.; Spanier, Jerome (2009) [1987].An Atlas of Functions: with Equator, the Atlas Function Calculator(2nd ed.). Springer.doi:10.1007/978-0-387-48807-3.ISBN978-0-387-48806-6.
  7. ^abOlver, Frank W. J.; Lozier, Daniel W.; Boisvert, Ronald F.; Clark, Charles W., eds. (2010).NIST Handbook of Mathematical Functions.National Institute of Standards and Technology.ISBN978-0-521-19225-5.MR2723248.
  8. ^Angel, Allen R.; Runde, Dennis C.; Gilligan, Lawrence; Semmler, Richard (2010).Elementary Algebra for College Students(8th ed.).Prentice Hall.Ch. 1, §9, Objective 3.ISBN978-0-321-62093-4.
  9. ^"Formula Returns Unexpected Positive Value".Microsoft.2005-08-15. Archived fromthe originalon 2015-04-19.Retrieved2012-03-05.
  10. ^abChrystal, George(1904) [1886].Algebra.Vol. 1 (5th ed.)."Division", Ch. 1 §§19–26,pp. 14–20.

    Chrystal's book was the canonical source in English about secondary school algebra of the turn of the 20th century, and plausibly the source for many later descriptions of the order of operations. However, while Chrystal's book initially establishes a rigid rule for evaluating expressions involving '÷' and '×' symbols, it later consistently gives implicit multiplication higher precedence than division when writing inline fractions, without ever explicitly discussing the discrepancy between formal rule and common practice.

  11. ^Cajori, Florian(1928).A History of Mathematical Notations.Vol. 1. La Salle, Illinois: Open Court.§242. "Order of operations in terms containing both ÷ and ×",p. 274.
  12. ^abcWu, Hung-Hsi (2007) [2004].""Order of operations" and other oddities in school mathematics "(PDF).Dept. of Mathematics, University of California.Retrieved2007-07-03.
  13. ^In theISO 80000standard, the division symbol '÷' is entirely disallowed in favor of a slash symbol:
    ISO 80000-2:2019,"Quantities and units – Part 2: Mathematics".International Standards Organization.
  14. ^Lennes, N. J. (1917). "Discussions: Relating to the Order of Operations in Algebra".The American Mathematical Monthly.24(2): 93–95.doi:10.2307/2972726.JSTOR2972726.
  15. ^abStrogatz, Steven(2019-08-02)."The Math Equation That Tried to Stump the Internet".The New York Times.Retrieved2024-02-12.In this article, Strogatz describes the order of operations as taught in middle school. However,in a comment,he points out,
    "Several commenters appear to be using a different (and more sophisticated) convention than the elementary PEMDAS convention I described in the article. In this more sophisticated convention, which is often used in algebra, implicit multiplication (also known as multiplication by juxtaposition) is given higher priority than explicit multiplication or explicit division (in which one explicitly writes operators like × * / or ÷). Under this more sophisticated convention, the implicit multiplication in 2(2 + 2) is given higher priority than the explicit division implied by the use of ÷. That’s a very reasonable convention, and I agree that the answer is 1 if we are using this sophisticated convention.
    "But that convention is not universal. For example, the calculators built into Google and WolframAlpha use the less sophisticated convention that I described in the article; they make no distinction between implicit and explicit multiplication when they are asked to evaluate simple arithmetic expressions. [...]"
  16. ^ab"Physical Review Style and Notation Guide"(PDF).American Physical Society.2012. § IV.E.2.e.Retrieved2012-08-05.
  17. ^Graham, Ronald L.;Knuth, Donald E.;Patashnik, Oren(1994).Concrete Mathematics(2nd ed.). Reading, Mass: Addison-Wesley. "A Note on Notation", p. xi.ISBN0-201-55802-5.MR1397498.An expression of the forma/bcmeans the same asa/(bc).Moreover,logx/logy=(logx)/(logy)and2n!= 2(n!).
  18. ^Fateman, R. J.; Caspi, E. (1999).Parsing TEX into mathematics(PDF).International Symposium on Symbolic and Algebraic Computation, Vancouver, 28–31 July 1999.
  19. ^Haelle, Tara (2013-03-12)."WhatIsthe Answer to That Stupid Math Problem on Facebook? And why are people so riled up about it? ".Slate.Retrieved2023-09-17.
  20. ^"Rules of arithmetic"(PDF).Mathcentre.ac.uk.2009.Retrieved2019-08-02.
  21. ^Ginsburg, David (2011-01-01)."Please Excuse My Dear Aunt Sally (PEMDAS)--Forever!".Education Week - Coach G's Teaching Tips.Retrieved2023-09-17.
  22. ^abVanderbeek, Greg (2007).Order of Operations and RPN(Expository paper). Master of Arts in Teaching (MAT) Exam Expository Papers. Lincoln: University of Nebraska. Paper 46.Retrieved2020-06-14.
  23. ^Ali Rahman, Ernna Sukinnah; Shahrill, Masitah; Abbas, Nor Arifahwati; Tan, Abby (2017)."Developing Students' Mathematical Skills Involving Order of Operations"(PDF).International Journal of Research in Education and Science.3(2): 373–382.doi:10.21890/ijres.327896.p. 373:The PEMDAS is an acronym or mnemonic for the order of operations that stands for Parenthesis, Exponents, Multiplication, Division, Addition and Subtraction. This acronym is widely used in the United States of America. Meanwhile, in other countries such as United Kingdom and Canada, the acronyms used are BODMAS (Brackets, Order, Division, Multiplication, Addition and Subtraction) and BIDMAS (Brackets, Indices, Division, Multiplication, Addition and Subtraction).
  24. ^"Le calcul qui divise: 6÷2(1+2)".Micmaths(Video) (in French). 2020-11-17.
  25. ^abcdBall, John A. (1978).Algorithms for RPN calculators(1st ed.). Cambridge, Mass: Wiley. p. 31.ISBN0-471-03070-8.
  26. ^Davies, Peter (1979). "BODMAS Exposed".Mathematics in School.8(4): 27–28.JSTOR30213488.
  27. ^abcKnight, I. S. (1997). "Why BODMAS?".The Mathematical Gazette.81(492): 426–427.doi:10.2307/3619621.JSTOR3619621.
  28. ^"Order of operations"(DOC).Syllabus.bos.nsw.edu.au.Retrieved2019-08-02.
  29. ^Foster, Colin (2008)."Higher Priorities".Mathematics in School.37(3): 17.JSTOR30216129.
  30. ^Naddor, Josh (2020).Order of Operations: Please Excuse My Dear Aunt Sally as her rule is deceiving(MA thesis). University of Georgia.
  31. ^Ameis, Jerry A. (2011). "The Truth About PEDMAS".Mathematics Teaching in the Middle School.16(7): 414–420.doi:10.5951/MTMS.16.7.0414.JSTOR41183631.
  32. ^Cheng, Eugenia(2023).Is Math Real? How Simple Questions Lead Us to Mathematics' Deepest Truths.Basic Books. pp. 235–238.ISBN978-1-541-60182-6.
  33. ^Lee, Jae Ki; Licwinko, Susan; Taylor-Buckner, Nicole (2013)."Exploring Mathematical Reasoning of the Order of Operations: Rearranging the Procedural Component PEMDAS".Journal of Mathematics Education at Teachers College.4(2): 73–78.doi:10.7916/jmetc.v4i2.633.p. 73:[...] students frequently make calculation errors with expressions which have either multiplication and division or addition and subtraction next to each other. [...]
  34. ^Dupree, Kami M. (2016). "Questioning the Order of Operations".Mathematics Teaching in the Middle School.22(3): 152–159.doi:10.5951/mathteacmiddscho.22.3.0152.
  35. ^Taff, Jason (2017). "Rethinking the Order of Operations (or What Is the Matter with Dear Aunt Sally?)".The Mathematics Teacher.111(2): 126–132.doi:10.5951/mathteacher.111.2.0126.
  36. ^"Calculation Priority Sequence".support.casio.com.Casio.Retrieved2019-08-01.
  37. ^"Implied Multiplication Versus Explicit Multiplication on TI Graphing Calculators".Texas Instruments.2011.Retrieved2015-08-24.
  38. ^Announcing the TI Programmable 88!(PDF).Texas Instruments.1982.Retrieved2017-08-03.Now, implied multiplication is recognized by theAOSand the square root, logarithmic, and trigonometric functions can be followed by their arguments as when working with pencil and paper.(NB. The TI-88 only existed as a prototype and was never released to the public.)
  39. ^Simons, Peter Murray(2021)."Łukasiewicz's Parenthesis-Free or Polish Notation".Stanford Encyclopedia of Philosophy.Dept. of Philosophy, Stanford University.Retrieved2022-03-26.
  40. ^Krtolica, Predrag V.; Stanimirović, Predrag S. (1999). "On some properties of reverse Polish Notation".Filomat.13:157–172.JSTOR43998756.
  41. ^Henderson, Harry (2009) [2003]."Operator Precedence".Henderson's Encyclopedia of Computer Science and Technology(Rev. ed.). New York:Facts on File.p. 355.ISBN978-0-8160-6382-6.Retrieved2023-09-17.
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  43. ^"6. Expressions".Python documentation.Retrieved2023-12-31.
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  45. ^Backus, John Warner;et al. (1963). "§ 3.3.1: Arithmetic expressions". InNaur, Peter(ed.).Revised Report on the Algorithmic Language Algol 60(Report).Retrieved2023-09-17.(CACM Vol. 6 pp. 1–17; The Computer Journal, Vol. 9, p. 349; Numerische Mathematik, Vol. 4, p. 420.)
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  48. ^Doctor Peterson, The Math Forum (2000-11-22)."History of the Order of Operations".Ask Dr Math.Archived fromthe originalon 2002-06-19.Retrieved2024-10-04.

Further reading

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