Math is Fun
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Overview
Math explained in easy language, plus puzzles, games, worksheets and an illustrated dictionary. For K-12 kids, teachers and parents.
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Bra-Ket Notation
Also called Dirac Notation. Bra-Ket is a way of writing special vectors used in Quantum Physics: braket. It is a play on the word bracket:
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Perimeter of an Ellipse
Strangely, the perimeter of an ellipse is very difficult to calculate! There are many formulas, here are some interesting ones.
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