Assume I've worked out a 2

*power*3 (8) cell truth table for P an Q where:

P=I win the lottery

Q=I give you a million dollars

Where is the difference between:

1.

**P => Q**

2.

**P <=> Q**

And how do the tautological examples above differentiate from simple, non-tautological implication and identity. For identity, assuming again the above truth table, where's the difference between:

1.

**P<=>Q**

2.

**P<->Q**

I know this is a pain, but I have to understand it. 'appreciate the help.

This post has been edited by **jayman9**: 29 August 2008 - 05:05 PM