shortcuts for tangent vectors

I expect to write a lot of them and I do not fancy writing a lot of \frac and search for ∂ on my keyboard

tex/header/preamble.tex

@@ -38,7 +38,8 @@
 \ihead{Version: \textinput{current-commit}}
 
 % Abkürzunngen
-
+\newcommand{\tanvec}[2][]{\frac{∂#1}{∂#2}}  % tangent vector
+\newcommand{\tanvecat}[3][]{\rest{\tanvec[#1]{#2}}{#3}}  % tangent vector at point
 % weitere Befehle
 
 % Typografisches