нижняя функция
Обозначает наибольшее целое, которое не превосходит x (МСЭ-Т T.800).
[http://www.iks-media.ru/glossary/index.html?glossid=2400324]
Англо-русский словарь нормативно-технической терминологии. academic.ru. 2015.
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