1. Limited time only! Sign up for a free 30min personal tutor trial with Chegg Tutors
    Dismiss Notice
Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

Homework Help: Help with logic proof (this should be really basic)

  1. Nov 4, 2008 #1
    help with logic proof (this "should" be really basic)

    Hey I am new to logic (I've just started a masters)

    I can't for the life of me prove this using only the natural deduction inference rules:

    A --> B |- ¬A v B

    I can do it easily in the other direction but I cannot do it in the above direction.

    It's annoying as I can do it easily using truth tables!

    Any help much appreciated.

    1. The problem statement, all variables and given/known data

    2. Relevant equations

    3. The attempt at a solution
  2. jcsd
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook

Can you offer guidance or do you also need help?
Draft saved Draft deleted