First an example: f[x_,y_]:=x+y would have arity 2 because it takes 2 inputs while the function g[x]:=0 has arity 1, even though it doesn't change with the input. Is there a way to find the arity of a function? Something like a symbol Arity that evaluates Arity[f] to 2.
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$\begingroup$ possibly useful: community.wolfram.com/groups/-/m/t/792850 $\endgroup$– Jason B.Nov 20, 2017 at 23:27
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