We talked about proof by contradiction in the last couple of classes. Today we proved that √2 is irrational using proof by contradiction (which is also called, in latin, reductio ad absurdum). You can also review direct proof here (use the pop-up menu to review indirect proof and other topics as well).

Tonight's homework is the play below. Make a list of all the Braves and Brights. We'll discuss it in class tomorrow. ;-)

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## January 15, 2007

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