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OpenStudy (anonymous):
its there any theorem that support that the multiplication of an irrational number by a rational number is irrational? its there any theorem that support that the multiplication of an irrational number by a rational number is irrational? @Mathematics
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OpenStudy (anonymous):
Not rigorous at all.(elementary and could be flawed ) http://homeschoolmath.blogspot.com/2006/03/prove-that-irrationalnon-zero-rational.html
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