つね微分 びぶん方程 ほうてい しきじゃありませんでした
tsunebibunhōteishikijārimasendeshita

Noun
Desu Copula

The polite, past negative form of 常微分方程式

1. Was not an ordinary differential equation.; It was not a regular differential equation.

Past/Perfective
Negative
Polite
Terminal Form
Mathematics