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All componens different

  • To: mathgroup at
  • Subject: [mg111996] All componens different
  • From: "Dr. Wolfgang Hintze" <weh at>
  • Date: Mon, 23 Aug 2010 02:51:46 -0400 (EDT)

Given a list v of natural numbers I'm looking for a function d[v_] that 
returns True if all components are different and False otherwise.

One solution is

d1[v_] := ! Or @@ Flatten[Table[v[[i]] == v[[k]], {i, 1, Length[v]}, 
{k, i + 1, Length[v]}]]

Can you find more efficient (and elegant) solutions?


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