Impl special functions

[cpmech]

No description provided.

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 99.83633% with 4 lines in your changes are missing coverage. Please review.

Project coverage is 99.13%. Comparing base (e4090e6) to head (d610118).
Report is 29 commits behind head on main.

Files	Patch %	Lines
russell_lab/src/math/elliptic.rs	99.28%	4 Missing ⚠️

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Additional details and impacted files

@@            Coverage Diff             @@
##             main      #92      +/-   ##
==========================================
+ Coverage   99.08%   99.13%   +0.05%     
==========================================
  Files         146      154       +8     
  Lines       32028    34919    +2891     
==========================================
+ Hits        31734    34618    +2884     
- Misses        294      301       +7     

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