<span class="searchmatch">下</span>(した)三(さん)角(かく)行(ぎょう)列(れつ) • (shita sankaku gyōretsu) (linear algebra) lower triangular matrix 上<span class="searchmatch">三角</span><span class="searchmatch">行列</span>...
上(うえ)三(さん)角(かく)行(ぎょう)列(れつ) • (ue sankaku gyōretsu) (linear algebra) upper triangular matrix <span class="searchmatch">下</span><span class="searchmatch">三角</span><span class="searchmatch">行列</span>...