Hi,
I want to represent the \nabla symbolically without calculation. Is there
a way to declare such a symbol? Also for \triangle?
Moreover, I want to write a function say F(\nabla u) take \nabla*u as an
input. Is there a way to detect if I pass the "\nabla" into the function?
Pseudo code would be something like:
F(expression):
if \nabla in expression:
do something
else:
Many Thanks!
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