単調 たんちょう減少 げんしょう数列 すうれつじゃありませんでした
tanchōgenshō sū retsujārimasendeshita

Noun
Desu Copula

The polite, past negative form of 単調減少数列

1. Was not a monotonically decreasing sequence.

Past/Perfective
Negative
Polite
Terminal Form
Mathematics