fix typo in formula

[jlaehne]

Corrected typo in formula

Progress of the PR

• [X] Change implemented (can be split into several points),

[codecov-commenter]

Codecov Report

Merging #137 (ca90406) into main (e40de62) will not change coverage. The diff coverage is n/a.

@@           Coverage Diff           @@
##             main     #137   +/-   ##
=======================================
  Coverage   98.36%   98.36%           
=======================================
  Files          11       11           
  Lines         550      550           
=======================================
  Hits          541      541           
  Misses          9        9           

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