上うえ三さん角かく行ぎょう列れつ

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Meanings

1

noun

upper triangular matrix

mathematics

A square matrix where all entries below the main diagonal are zero. Used in linear algebra.

下した三さん角かく行ぎょう列れつ
A lower triangular matrix has zeros above the main diagonal, while an upper triangular matrix has zeros below it.
三さん角かく行ぎょう列れつ
A general term for triangular matrices; 上三角行列 specifically refers to the upper variant.

Compound of 上 (うえ, 'upper'), 三角 (さんかく, 'triangle'), and 行列 (ぎょうれつ, 'matrix'). The term directly describes the matrix shape.