単調 たんちょう減少 げんしょう数列 すうれつであれば
tanchōgenshō sū retsudeareba

Noun
Da Copula

The "-eba" conditional form ("if/when…") of 単調減少数列

1. If it is a monotonically decreasing sequence.; If the sequence is monotonically decreasing.

Ba Conditional
Mathematics