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  • To: mathgroup at
  • Subject: Count[{Unevaluated[a]},Unevaluated[a]]
  • From: Michael.Trott at
  • Date: Mon, 23 Nov 1992 19:10:50 +0000

 Hi cummunity,

 the above gives - a little bit surprisingly for me - 0.
 With a third argument: Count[{Unevaluated[a]},Unevaluated[a],{-1}]
 the result is 1 (as expected). Using On[] one sees that 
 Count "evaluates" its arguments. Literal instead of Unevaluated gives
 a similar result.
 Why does Count do this?

 Thanks for an answer,

 Michael Trott

 trott at

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