Terms
Combination Function
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C(n, k) = 
.
Discrete Function
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A function that is defined only for a set of numbers that can be listed, such as
the set of whole numbers or the set of
integers.
Explicit Definition
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A definition of a function by a formula in terms of the variable.
Factorial Function
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F(n) = n(n - 1)(n - 2)(n - 3) ... (2)(1)
where n is a non-negative integer.
We define F(0) = 1 and F(1) = 1.
Fibonacci Sequence
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The sequence 1, 1, 2, 3, 5, 8, 13, 21, 34, 55, ..., where each value is the sum
of the preceding two values. Defined recursively by:
Permutation Function
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P(n, k) = 
Recursive Definition
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A definition of a function in terms of the same function of a smaller variable.
