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March 20th, 2013, 02:47 PM   #1
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Discrete math direct proof question

I have a question on my homework that I have no idea how to start. If someone could show me the steps for this problem so I can see how it is done that would be awesome! Thanks

#1.) Prove using a direct proof that for every rational number x, if x ? 0, then 1/x is rational
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March 20th, 2013, 06:20 PM   #2
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Re: Discrete math direct proof question

"If x is rational, the what ?". What is the definition of "rational number"?
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March 21st, 2013, 12:23 PM   #3
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Re: Discrete math direct proof question

If x is rational, then x = m/n, where m and n are integers. What can you say about 1/x?
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