class = "S2"><span class="S8">or permuted triangular</span></span><span class = "S2"><span class="S0"> structure are solved with the appropriate style of triangular substitution.</span></span></div><div class = 'CodeBlock contiguous'><div class = 'inlineWrapper outputs'><div class = "S4 lineNode"><span class = "S5"><span class="S0">x</span><span class="S0"> = U \ (PtL\b)</span></span></div><div class="outputParagraph" style="white-space: normal; font-style: normal; color: rgb(64, 64, 64); font-size: 14px;">