Mr. Andre's notes

Mr. Andre’s Notes

 Vocabulary:

·      pàq                                       “p implies q”

·      pßàq                         “p if and only if q”

·      (pàq) ^ (qàp)             “p implies q, and q implies q”

 

-       ^=and

-       v= or (inclusive)

-       A’= not A, or the compliment of A

 

Implication//conditional statement:

p	q	pàq
True	True	True
True	False	False
False	True	True
False	False	True

 

“I promise if I find $20, I will give you $10.

 

Equivalence//conditional statement:

p	q	Pßàq
True	True	True
True	False	False
False	True	False
False	False	True

 

“I promise if and only if I find $20, I will give you $10.

 

 

Which door would he tell me to go through?

Two doors: one to certain death, one to certain freedom

Two guards: one always lies, one always tells the truth

 

Two men are exploring

They see a wild animal

One rushes back, one goes back slowlyàboth to home base

The rusher dies

What happened?

They were scuba diving, and the one that rushed back died of the bends

 

Man gets back to a hotel, suddenly realizes he’s bankrupt.

What happened?

He’s playing Monopoly.