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Direct Proof

  1. Mar 7, 2012 #1
    Hey guys,

    I'm in a proof class right now. We've covered direct proofs and moved on, but I'm still curious about them. Is there any important theorem that has even been derived using a direct proof (assume p to show q) or are they mainly just used to introduce proofs? In class, we only ever cover proofs such as "if n ##\equiv## 1 (mod 2), then n2 ##\equiv## 1 (mod 8)." and the like.

    Sorry, I can't get the tex to work out... aha, just got it working, nevermind
     
    Last edited: Mar 7, 2012
  2. jcsd
  3. Mar 7, 2012 #2

    jgens

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    Plenty of important theorems are proved using methods of direct proof. I presume that you are familiar with the fundamental theorems of calculus. The standard proofs of these results are done via direct proof. See here: http://en.wikipedia.org/wiki/Fundamental_theorem_of_calculus#Proof_of_the_first_part
     
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