Changes

Formal logic (view source)

No change in size , 16:17, March 13, 2008

→‎Rules of inference: 2nd rule had it exactly backwards

Line 23: Line 23:

#Therefore, B.

−

#If not A, then not B.

+

#If not B, then not A.

#Not B

#Therefore, not A.

[[category:logic]]

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