Propostion 2.3.5 (Multiplication is associative). /For any natural numbers \(a,b,c\), we ahve \((a \times b) \times c = a \times (b \times c)\).
\(Proof\) See Exercise 2.3.3.
Proposition 2.3.5
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Exercise 2.3.3 (Proporsition 2.3.5 )
2.3.3. Prove Proposition 2.3.5 (Hint: modify the proof of Proposition of 2.2.5 and use the distribution law.)
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Chapter2
Exercise 2.3.3. Prove proposition 2.3.5