Re: What is understanding?

["James W. Wheeler" <jwheeler@EAGLE.LHUP.EDU>]

The conditional implies the contrapositive and visa versa.
The inverse implies the converse and visa versa.

Physics HAS to be logical.  It does not follow, however, that the truth of
a conditional statement should preclude the creative guess that the
inverse is also true.  Indeed the truth is seldom limited to one of the
four forms proposed.  Physics cannot be merely deductive.

On Tue, 13 Jul 1999, K. Lee Lerner wrote:

> Fellow Scholars & Colleagues,
>
> Just for clarification, If I recall correctly:
>
> Conditional:  If  A then B
> Converse:  If B then A
> Inverse:  IF  NOT A then NOT B
> Contrapositive:  IF NOT B then NOT A
>
> If the conditional and converse are both true then  a biconditional.
> ----------------------------------------------------------------------------
> ------------
> If I am all wet on any of this,  please point out my errors.   Many moons
> have passed since I took predicate and formal logic.
>
> Best Regards,
> K.