This is actually invalid LaTeX: You can’t put the align environment inside math mode (\[...\] or $$...$$ ), even though MathJax seems to accept it. Try aligned environment instead and see if it works for you.
This is actually invalid LaTeX: You can’t put the align environment inside math mode (\[...\] or $$...$$ ), even though MathJax seems to accept it. Try aligned environment instead and see if it works for you.