An anonymous function is a function (or a subroutine) defined, and possibly called, without being bound to a name. In the lambda calculus, of which most programming languages are a superset, all functions are anonymous. The Y combinator can be utilised in these circumstances to provide anonymous recursion. Certain programming languages also provide support for both named and anonymous functions. Some object-oriented programming languages have anonymous classes, which are a similar concept. Partial plot of a function f. ... In computer science, a subroutine (function, method, procedure, or subprogram) is a portion of code within a larger program, which performs a specific task and is relatively independent of the remaining code. ... The lambda calculus is a formal system designed to investigate function definition, function application, and recursion. ... A programming language is an artificial language that can be used to control the behavior of a machine, particularly a computer. ... A is a subset of B, and B is a superset of A. In mathematics, especially in set theory, a set A is a subset of a set B, if A is contained inside B. The relationship of one set being a subset of another is called inclusion. ... Y Combinator is a seed-stage startup funding firm, started by Paul Graham, Robert Morris, Trevor Blackwell, and Jessica Livingston. ... This article needs to be cleaned up to conform to a higher standard of quality. ... Object-oriented programming (OOP) is a computer programming paradigm in which a software system is modeled as a set of objects that interact with each other. ...