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In Python, functions are first-class objects that can be created and passed around dynamically. Python's limited support for anonymous functions is the lambda construct. An example is the anonymous function which squares its input, called with the argument of 5:
All-equal and not-all-equal function: their values is 1 when the inputs do (not) all have the same value; Exact-count functions: their value is 1 on input vectors with k ones for a fixed k. One-hot or 1-in-n function: their value is 1 on input vectors with exactly one one; One-cold function: their value is 1 on input vectors with exactly one zero
In mathematics, specifically measure theory, the counting measure is an intuitive way to put a measure on any set – the "size" of a subset is taken to be the number of elements in the subset if the subset has finitely many elements, and infinity if the subset is infinite.
The Weierstrass factorization theorem asserts that any entire function can be represented by a product involving its zeroes (or "roots"). The entire functions on the complex plane form an integral domain (in fact a Prüfer domain). They also form a commutative unital associative algebra over the complex numbers.