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standard part function : ウィキペディア英語版
standard part function
In non-standard analysis, the standard part function is a function from the limited (finite) hyperreal numbers to the real numbers. Briefly, the standard part function "rounds off" a finite hyperreal to the nearest real. It associates to every such hyperreal x, the unique real x_0 infinitely close to it, i.e. x-x_0 is infinitesimal. As such, it is a mathematical implementation of the historical concept of adequality introduced by Pierre de Fermat,〔Karin Usadi Katz and Mikhail G. Katz (2011) A Burgessian Critique of Nominalistic Tendencies in Contemporary Mathematics and its Historiography. Foundations of Science. () See (arxiv ). The authors refer to the Fermat-Robinson standard part.〕 as well as Leibniz's Transcendental law of homogeneity.
The standard part function was first defined by Abraham Robinson who used the notation {}^{\circ}x for the standard part of a hyperreal x (see Robinson 1974). This concept plays a key role in defining the concepts of the calculus, such as continuity, the derivative, and the integral, in non-standard analysis. The latter theory is a rigorous formalisation of calculations with infinitesimals. The standard part of ''x'' is sometimes referred to as its shadow.
==Definition==

Nonstandard analysis deals primarily with the pair \mathbb\subset, where the hyperreals are an ordered field extension of the reals \mathbb, and contain infinitesimals, in addition to the reals. In the hyperreal line every real number has a collection of numbers (called a monad (non-standard analysis)

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