establish the following facts:
√ p is irrational for any prime p
please give me answer step by step!
establish the following facts:√ p is irrational for anyprime p
Sol
設√p為有理數
存在正整數m,n,√p=n/m,(m,n)=1
√p=n/m
m√p=n
m^2p=n^2
p|n^2
p為質數
p|n
存在正整數w,n=wp
m^2p=n^2=w^2p^ 2
m^2=2^2p
p|m^2p|m
p|n,p|m
p|(m,n)
p|1 (-><-)
So
√p為無理數
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Verified answer
establish the following facts:√ p is irrational for anyprime p
Sol
設√p為有理數
存在正整數m,n,√p=n/m,(m,n)=1
√p=n/m
m√p=n
m^2p=n^2
p|n^2
p為質數
p|n
存在正整數w,n=wp
m^2p=n^2=w^2p^ 2
m^2=2^2p
p|m^2p|m
p|n,p|m
p|(m,n)
p|1 (-><-)
So
√p為無理數