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English Wikipedia has an article on:

smooth function

Etymology

smooth + function

Noun

smooth function (plural smooth functions)

(mathematics) A function that has derivatives of all finite orders everywhere in its domain.
- 2003, Eric W. Weisstein, CRC Concise Encyclopedia of Mathematics, →ISBN, page 419:
  Any ANALYTIC FUNCTION is smooth. But a smooth function is not necessarily analytic.

Translations

function that has derivatives of all finite orders everywhere in its domain

Bulgarian: гла́дка фу́нцкия f (gládka fúnckija)
Spanish: función suave f
Swedish: slät funktion c, glatt funktion c

source: https://en.wiktionary.org/wiki/smooth_function