форматировать уравнения для groff или MathML (format equations for groff or MathML)
Ошибки (баги) (Bugs)
Inline equations are set at the point size that is current at the
beginning of the input line.
In MathML mode, the mark and lineup features don't work. These
could, in theory, be implemented with '<maligngroup>' elements.
In MathML mode, each digit of a numeric literal gets a separate
'<mn></mn>' pair, and decimal points are tagged with '<mo></mo>'.
This is allowed by the specification, but inefficient.
