[isabelle] Isabelle problem
Dear Isabelle User Group:
I've this problem using X-Isabelle. I've just downloaded Isabelle, with
Emacs 21.4.20 in a Kubuntu 7.10. Looking at the tutorial I put this simple
datatype 'a list = Nil ("")
| Cons 'a "'a list" (infixr "#" 65)
consts app :: "'a list => 'a list => 'a list" (infixr "@" 65)
rev :: "'a list => 'a list"
" @ ys = ys"
"(x # xs) @ ys = x # (xs @ ys)"
"rev  = "
"rev (x # xs) = (rev xs) @ (x # )"
But whenever I want to do something useful , like use the command (by
pressing the Command button in the Proof General Toolbar)
value "rev (True # False # )"
Isabelle respond with a
*** Illegal application of command "value" at top level
*** At command "value".
I'm making things wrong, or my installation is wrong?
Thanks in advance,
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