P and Q

The compound statement P ^ Q is only true when P and Q are true.

P = The Car Engine is on
Q = The Car Radio is on

The truth table makes sense in all cases because the truths correlate with our real life experience.

P = The Cat is asleep
Q= The Cat is awake

P AND Q in the truth table is true, but a cat cannot be awake and asleep the same time – so how can it be true.

Well, the truth table knows nothing about what a cat can do or cannot do.
All the truth table shows, is all possible combination of truths using the AND operator.

A cat being asleep and awake at the same time is just a combination of truths that do not actually occur in reality.


AND is associative so it can be used without any ambiguity.

For example:

((P ^ Q)  ^ R) <=> P ^ Q ^ R


1 Comment

  1. Pingback: P or Q « Jasoninclass's Blog

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