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  • $\begingroup$ Do Clear[f] . You probably have an old def for f without the NumericQ $\endgroup$ Commented Mar 18, 2018 at 13:58
  • $\begingroup$ Just definef to have the signature f[u_?NumericQ, v_?NumericQ, w_?NumericQ]. $\endgroup$ Commented Mar 18, 2018 at 14:34
  • $\begingroup$ And for the second integration? What is the sintaxis to integrate the square of this f? $\endgroup$ Commented Mar 18, 2018 at 14:38
  • $\begingroup$ please fix the noted errors and update the question with whatever new problem you have $\endgroup$ Commented Mar 18, 2018 at 15:21
  • 1
    $\begingroup$ "example 4" suggests there's a reference for this problem. If so, what is it? $\endgroup$ Commented Mar 18, 2018 at 15:23