Tkinter special math chars

[phil]

Using Tkinter to teach high school geometry.
Sorta committed to Tkinter at least for now.
Would like to use some special chars like
limits, infinity, square root, cube root
and a buch more.
in Text Box and Cancas

Is there some package I can integrate with
Tkinter to do this.

Even better would a 'supplemental' font file.
In other words I create my own fonts without
disturbing the regular fonts and I have to write the
code which tells it when to use the special fonts.
I haven't a clue how to do something like that.
I know Tkinter will let you change fonts but
I would have to control it on a char basis
somthing like:
'As the function approaches {INFINITY}'
scan and somehow replace.

TIA.