1

How would I deduce a≠c from the premises a≠b and b≠c in Fitch? This is what I've done so far.

b=b (=Intro)

b≠a (Ana Con)

b≠c (Reit)

And then for some reason I get stuck here? I know this sounds simple, but I'm lost! Thanks in advance.

7

You can't, because it isn't valid. Think about it with numbers, consider:

a=1
b=2
c=1

It's true that a≠b & b≠c, yet a=c.

Your Answer

By clicking “Post Your Answer”, you agree to our terms of service, privacy policy and cookie policy

Not the answer you're looking for? Browse other questions tagged or ask your own question.