October 24th, 2009, 05:30 PM  #1 
Newbie Joined: Apr 2009 Posts: 7 Thanks: 0  mathematical proofs
So, I dont know if this is the correct place to put this, if not, mods could you please put it in the right sub forums. I'm in a mathematical proof class, and we've been starting on proofs, of the two column variety. I missed a couple of classes due to the flu, and am now way behind. I plan on going into the professor, but I was wondering about some very basic proofs like (a) = a. what would be the correct list of steps for something like that? Also, here are a couple others. (a)b = (ab) Using the the theorem (a) = (1)a, I can write (a)b as (1)(a)(b). Then using associativity, i can rewrite that as (1)(ab) and that is equivalent to (ab). It seems too simple, am I missing steps, or just going about this all wrong? a + a + 2a. Would this one just be using the definition of 1? Saying that 1 x a = a. then a + a must equal 2a? How would you write a proof of (a^1)^1 = a if a is nonzero? How about If a < b, then a > b? Thank you so much 
October 24th, 2009, 11:46 PM  #2  
Senior Member Joined: Oct 2007 From: Chicago Posts: 1,701 Thanks: 3  Re: mathematical proofs Quote:
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For the second one, you really do exactly what it looks like you need to do. (Think about 8th grade ) Quote:
Cheers  

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