Underscores in function names conflict with LaTeX and shown as subscripts

[ryosuketc]

Underscores in function names conflict with LaTeX and thus it is represented as subscript in LaTeX.

In Jupyter Notebook:

@latexify.with_latex
def func_with_underscore(x):
  return 1

func_with_underscore

[odashi]

Yeah the underscores in identifiers should be escaped normally, but in some few cases they are worthy for special treatment (as #6 discussed).

[1MLightyears]

It looks like only "_" the underline is the only character that has the problem
See if I could fix it 🤔

[yasirroni]

For those that come here and confused to implement it:

@latexify.with_latex(use_raw_function_name=True)
def forward_diff(f, h, x):
    return f(x + h) / h

See #82