Question is how. `kbordermatrix` is not supported by MathJax. Nested arrays lose alignment with variable cell width/height, like here: https://math.meta.stackexchange.com/questions/31597/how-do-i-label-the-rows-columns-of-a-matrix-in-mathjax
Question is how.
kbordermatrixis not supported by MathJax.Nested arrays lose alignment with variable cell width/height, like here: https://math.meta.stackexchange.com/questions/31597/how-do-i-label-the-rows-columns-of-a-matrix-in-mathjax