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Could you tell me how to write a very formal proof of the statement below with the contrapositive methode, if possible.
(I know how to do it with contradiction)
Let x be a rational number and y an irrational number, then x times y is irrational.
Sincerely,
V. Uljanov
(I know how to do it with contradiction)
Let x be a rational number and y an irrational number, then x times y is irrational.
Sincerely,
V. Uljanov