In [2], YIN Jing-rao gets the triangle inequality about simplex.

在[2]中尹景尧得出关于单纯形的一类三角不等式。

youdao

You can say that the proof USES nothing beyond elementary matrix theory, repeated use of the triangle inequality, and the pigeonhole principle.

你可以简要地说其实证明就是初等矩阵理论，三角不等式和鸽笼原理的运用。

youdao

For instance, it's also the square of the Euclidean norm on R2, the length of a two-dimensional vector, a part of the triangle inequality, and quite a bit more.

例如，R 2 的平方、二维向量的长度、三角不等式等都存在勾股定理。

youdao