2
와 문제를합니까 : 어떻게 그것을 예라면이자벨 : 이자벨에서 다음 평등 보류 setprod
setprod f (UNIV :: 'n∷finite set) = setprod (λx. x) (f ` (UNIV :: 'n∷finite set))
, 증명할 수 있습니까?
(* tested with Isabelle2013-2 *)
theory Notepad
imports
Main
"~~/src/HOL/Library/Polynomial"
begin
notepad
begin{
fix f :: "'n∷finite ⇒ ('a::comm_ring_1 poly)"
have "finite (UNIV :: 'n∷finite set)" by simp
from this have "setprod f (UNIV :: 'n∷finite set) = setprod (λx. x) (f ` (UNIV :: 'n∷finite set))"
sorry (* can this be proven ? *)