The `pmathx` module extends `pmathml` with some
further default elements and some further math constructs.
Some of these are experimental. Currently the extensions include:

- infix superscript and subscript operators,
`sub`,`sup`and`subsup`and infix over and under operators,`over`,`under`and`underover` - set construction operators
`setl <mrow-contents>`and`setp <math-object> <math-object>`. - fenced absolute-value operator
`abs <math-object>`. - overline and underline operators
`overline <math-object>`,`underline <math-object>`. - series operator
`series <math-object> <math-object> <mrow-content>`. - factorial operator
`<mrow-content> factorial`. - further token elements:
`supremum`,`supremum`,`infimum`,`cf`,`divides`,`log`,`ln`,`exp`,`sin`,`cos`,`tan`,`sinh`,`cosh`,`tanh`,`max`,`min`,`lim`. There may be others, and it is easy to define others.

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