Thursday, February 11, 2010

Truth Tables

On Monday and Tuesday in Renata's class we learned about truth tables.

Since mathematicians are lazy, we abbreviate whole statements by single letters:
A "Maria has a purple pencil."
B "Alec has a blue pencil."

Then we use a truth table to examine what happens if each statement is true or false. The tilde (~) is used to mean "not" or "negation."

A B (A and B) (A or B) ~A
T T T T F
T F F T F
F T F T T
F F F F T

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