Better mathematical expression

[xadupre]

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[codecov-commenter]

Codecov Report

Attention: Patch coverage is 0% with 1 line in your changes missing coverage. Please review.

Project coverage is 82.67%. Comparing base (0558411) to head (5f9f35d).
Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
mlstatpy/render_js_dot.py	0.00%	1 Missing ⚠️

Additional details and impacted files

@@ Coverage Diff @@## main #52 +/- ## ========================================== + Coverage 82.30% 82.67% +0.36%  ========================================== Files 32 32 Lines 4097 4097 ========================================== + Hits 3372 3387 +15 + Misses 725 710 -15 

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