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Re: All componens different

  • To: mathgroup at smc.vnet.net
  • Subject: [mg111997] Re: All componens different
  • From: Ray Koopman <koopman at sfu.ca>
  • Date: Tue, 24 Aug 2010 06:12:24 -0400 (EDT)
  • References: <i4t5qb$g2q$1@smc.vnet.net>

On Aug 22, 11:51 pm, "Dr. Wolfgang Hintze" <w... at snafu.de> wrote:
> 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?

Unequal @@ v


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