整数部って表現だと曖昧になるっぽい＞＜
Floor and ceiling functions - Wikipedia
https://en.wikipedia.org/wiki/Floor_and_ceiling_functions
"The floor of x is also called the integral part, integer part, greatest integer, or entier of x, and was historically denoted [x] (among other notations).[2]
However, the same term, integer part, is also used for truncation towards zero, which differs from the floor function for negative numbers. "
フォロー
で、最初に整数部って言葉を作ったアドリアン=マリ・ルジャンドル（？）は、負の場合はゼロに近い方を採用していた可能性が高いっぽいってGeminiが言ってた＞＜（？）
