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上 うえ三角 さんかく行列 ぎょうれつでした
uesankakugyōretsudeshita

敬
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Noun
, 
Desu Copula

The polite past form of 上三角行列

1. It was an upper triangular matrix.

Past/Perfective
, 
Polite
, 
Mathematics

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上三角行列でした

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