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    $\begingroup$ What are you trying to achieve? $\endgroup$ Commented Oct 25 at 22:52
  • $\begingroup$ @azerbajdzan it seems, with Finite Field function no basic replacement rule works: exp/.FiniteField[x_]:>FiniteField[z]; exp/.FiniteField[x_][y_]:>FiniteField[z][y]; exp/.FiniteField[__]:>FiniteField[z]; exp/.FiniteField[x_]->FiniteField[z]; $\endgroup$ Commented Oct 25 at 23:37
  • $\begingroup$ @azerbajdzan I want to replace in output a list with a finite field expression with a number. For instance, FFvector[{n_, FiniteField[q][n_]}]:>n $\endgroup$ Commented Oct 25 at 23:41
  • $\begingroup$ Look at the FullForm of some FiniteField - this is the pattern that should be matched. $\endgroup$ Commented Oct 26 at 8:24
  • $\begingroup$ Have you tried something like vec=Table[FiniteField[3][k],{k,0,2}]; Through[vec["Index"]]? $\endgroup$ Commented Oct 26 at 14:53