Principle of mathematical induction

**flower3** · October 19th 2009, 09:23 AM

Use the principle of mathematical induction to prove that if $a \in R$ then $( a^{m} ) ^n = a^{mn} , \forall m,n \in N$

TRUE OR NOT ?? :
1) WANT TRUE FOR n=1 AND m=1 :
$(a^{1 )^ 1 } = a^{1.1} \to a=a$
2) SUPPOSE TRUE FOR n=k AND m=v :
$(a^ {v ) ^k }= a^{vk}$
3) WANT TRUE FOR n=k+1 AND m=v+1 :
$(a^ {v+1 ) ^k+1 }= a^{(v+1)(k+1)}$ HOW I PROVE IT ???

**redsoxfan325** · October 19th 2009, 02:03 PM

Originally Posted by flower3

Use the principle of mathematical induction to prove that if $a \in R$ then $( a^{m} ) ^n = a^{mn} , \forall m,n \in N$

TRUE OR NOT ?? :
1) WANT TRUE FOR n=1 AND m=1 :
$(a^{1 )^ 1 } = a^{1.1} \to a=a$
2) SUPPOSE TRUE FOR n=k AND m=v :
$(a^ {v ) ^k }= a^{vk}$
3) WANT TRUE FOR n=k+1 AND m=v+1 :
$(a^ {v+1 ) ^k+1 }= a^{(v+1)(k+1)}$ HOW I PROVE IT ???

$(a^{v+1})^{k+1}=(a^v\cdot a)^{k+1}=(a^v)^{k+1}\cdot a^{k+1}=(a^v)^k\cdot a^v\cdot a^{k+1}$

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