The piecewise definition of the absolute value.

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The midpoint formula in the plane.

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The notation for the composition of the function f with the function g.

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The formula for finitely compounded interest.

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A radical form of the Golden Ratio.

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The distance formula in the plane.

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A standard form for a hyperbola.

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The natural logarithm.

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Definition of an odd function.

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The combinatoric formula for choosing r items from a set of n items, in which the order of selection doesn't matter.

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The sparse general form of an m by n matrix.

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The limit definition of the Euler number e, a transcendental number.

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The standard form for the equation of a circle. 

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The imaginary square root of -1.  

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The collection of values cycled through by positive-integer powers of i, the imaginary square root of -1.  

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A method of calculating the determinant of a 3 x 3 matrix.  

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A form of the Binomial Theorem.

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A definition for the set of rational numbers Q.

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