Formal Logic Problem

kev1389
Posts: 1
Joined: Sat Sep 15, 2012 12:20 pm

Formal Logic Problem

Postby kev1389 » Sat Sep 15, 2012 12:24 pm

Which inferences (if any) can be deduced from the following statement:

A ---> B <--- C

bp shinners
Posts: 3091
Joined: Wed Mar 16, 2011 7:05 pm

Re: Formal Logic Problem

Postby bp shinners » Sat Sep 15, 2012 1:48 pm

kev1389 wrote:Which inferences (if any) can be deduced from the following statement:

A ---> B <--- C


If I've got your terminology right, we could rewrite that as:
A->B
C->B

or

~B->~A
~B->~C

so

~B->~A and ~C
A or C->B

~A-s-~C (Some things that are not A are also not C)




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