Solutions To Mathematics Textbooks/Proofs and Fundamentals/Chapter 7
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Section 7.1[edit | edit source]
7.1.1[edit | edit source]
1[edit | edit source]
2[edit | edit source]
7.1.2[edit | edit source]
(2) The binary operation * in defined by
Answer: The binary operation * in is not commutative, counter example: With :
and
Like , the definition of commutativity is not satisfied.