Strictly monotonous - Kyogitancho

Japanese: 狭義単調 - きょうぎたんちょう
Strictly monotonous - Kyogitancho

...Increasing and decreasing functions are collectively called monotonic functions. In particular, when f ( x1 )< f ( x2 ) or f ( x1 ) > f (x2) for as long as x1<x2, f(x ) is said to be strictly monotonically increasing or decreasing, respectively, and these cases are collectively called strictly monotonic. The monotonicity of a function can also be described for a portion of its domain. ...

*Some of the terminology explanations that mention "narrowly monotonic" are listed below.

Source | Heibonsha World Encyclopedia 2nd Edition | Information

Japanese:

…増加関数と減少関数とを総称して単調関数という。とくに,x1x2なるかぎりf(x1)<f(x2),またはf(x1)>f(x2)となるとき,それぞれf(x)は狭義単調増加,または狭義単調減少であるといい,これらの場合を総称して狭義単調であるという。関数の単調性は,その定義域の一部の区間についていうこともある。…

※「狭義単調」について言及している用語解説の一部を掲載しています。

出典|株式会社平凡社世界大百科事典 第2版について | 情報

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