let D, D', E be non empty set ; :: thesis: for d being Element of D
for F being Function of [:D,D':],E holds F [;] d,(<*> D') = <*> E
let d be Element of D; :: thesis: for F being Function of [:D,D':],E holds F [;] d,(<*> D') = <*> E
let F be Function of [:D,D':],E; :: thesis: F [;] d,(<*> D') = <*> E
reconsider r = F [;] d,(<*> D') as FinSequence of E by Th91;
len (<*> D') = 0 ;
then len r = 0 by Th92;
hence F [;] d,(<*> D') = <*> E ; :: thesis: verum