ASSOCIATIVE LAW
| in mathematics, law holding that for a given operation combining three quantities, two at a time, the initial pairing is arbitrary; e.g., using the operation of addition, the numbers 2, 3, and 4 may be combined (2+3)+4=5+4=9 or 2+(3+4)=2+7=9. More generally, in addition, for any three numbers a, b, and c the associative law is expressed as (a+b)+c=a+(b+c). Multiplication of numbers is also associative, i.e., (a×b)×c=a×(b×c). In general, any binary operation, symbolized by ∘, joining mathematical entities A, B, and C obeys the associative law if (A∘B)∘C=A∘(B∘C) for all possible choices of A, B, and C. Not all operations are associative. For example, ordinary division is not, since (60÷12)÷3=5÷3=5/3, while 60÷(12÷3)=60÷4=15. When an operation is associative, the parentheses indicating which quantities are first to be combined may be omitted, e.g., (2+3)+4=2+(3+4)=2+3+4. ____________________The Columbia Encyclopedia, Sixth Edition Copyright© 2004, Columbia University Press. Licensed from Lernout & Hauspie Speech Products N.V. All rights reserved. -3121- | |
|
About Questia
Questia is the world's largest online academic library offering full-text books, journals, and articles on thousands of topics.
Join Now...
|
|
Questia Books and Articles on: Associative Law
|
| We found: |
7237 results |
By media type: |
Books: | Journal articles: | Magazine articles: | Newspaper articles: | Encyclopedia articles: |
|
|