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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