sympy__sympy-15976

A symbol ending with a number is made invisible when printing with MathML

Verdict: the fix is stated in the issue (Tier A).

Removing the pair of `mi` tags around `<msub><mi>x</mi><mi>2</mi></msub>` works.

The text states the fix: “Removing the pair of `mi` tags around `<msub><mi>x</mi><mi>2</mi></msub>` works.”