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 March 20th, 2013, 02:47 PM #1 Newbie   Joined: Mar 2013 Posts: 1 Thanks: 0 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
 March 20th, 2013, 06:20 PM #2 Math Team   Joined: Sep 2007 Posts: 2,409 Thanks: 6 Re: Discrete math direct proof question "If x is rational, the what ?". What is the definition of "rational number"?
 March 21st, 2013, 12:23 PM #3 Global Moderator   Joined: May 2007 Posts: 6,807 Thanks: 717 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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