# Complexity Zoo:K

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Complexity classes by letter: Symbols - A - B - C - D - E - F - G - H - I - J - K - L - M - N - O - P - Q - R - S - T - U - V - W - X - Y - Z

Lists of related classes: Communication Complexity - Hierarchies - Nonuniform

##### K: Feasibly recursive functions

A class of number-theoretic functions, defined as the closure of basic integer arithmetic operations ($+, -, \cdot, \lfloor x/y\rfloor$, as well as constants 0, 1, and projections) under composition and polynomially long sums and products. Defined by [Con73], who mistakenly claimed it coincides with FP.

Equals UD-uniform FTC0 by [Hes01].