Wednesday, February 11, 2009

2/11/09 Deductive logic

Modus Ponens

If the pen is red, it will write red
the pen is red

If the earth is round, it is shaped like a sphere
the earth is round

If the library has books, the library has a lot of paper
the library has books


Modus Tollens

If the jellyfish eats fish, then it will survive
the jellyfish does not eat fish therefore it will not survive.

If the earth is flat, then we will fall off on the other side
the earth is not flat therefore we will not fall off.

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