
Real Analysis Real Analysis Math Forum 
 LinkBack  Thread Tools  Display Modes 
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: 6,511 Thanks: 584  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?


Tags 
direct, discrete, math, proof, question 
Thread Tools  
Display Modes  

Similar Threads  
Thread  Thread Starter  Forum  Replies  Last Post 
Discrete Math Set Theory Proof  Lolligirl  Applied Math  6  March 3rd, 2011 09:04 AM 
Discrete Math  Funcion Proof  red_roee  Applied Math  3  November 15th, 2010 06:34 PM 
proof problem  relations in discrete math  dalant019  Applied Math  2  June 18th, 2010 07:05 PM 
Discrete math set question someone help?? thank you  peiyilee  Applied Math  0  March 24th, 2008 08:46 AM 
Discrete Math Proof  Dmitry Malayev  Applied Math  1  February 12th, 2008 11:08 AM 