Lack of equals sign
I dont know if it is my techniques problem. When I run the sample code on Pycharm and use the converted latex code, there is no equals sign between left hand expression and right hand expression.

@FywOo02 Thanks for reporting the problem. Could you check the following things:
- What is printed if you run
print(latexify.get_latex(your_function)). I guess your function may be the one in the example. - Whether your LaTeX compiler supports
\triangleq( $\triangleq$ ) or not.
@FywOo02 Hi, I think the cause of this problem is that your LaTeX document lacks \usepackage{amssymb}.
\triangleq is a part of the AMS package that is enabled in Jupyter (MathJax) by default. But specifying amssymb is required if the generated source is used in your own LaTeX document.
I think this should be treated as a minor bug, and we may need to remove this symbol for compatibility with the bare LaTeX.