無限 むげん かい微分 びぶん可能 かのうではありませんでした
mugenka ibibunkano udewa arimasendeshita

Desu Copula
na-Adjective

The polite, past negative form of 無限回微分可能

1. Was not infinitely differentiable.; Was not possible to infinitely differentiate.

Past/Perfective
Negative
Polite
Formal Register
Mathematics