let E be set ; :: thesis: for A being Subset of (E ^omega )
for k, l being Nat st k <= l holds
(A + ) ^^ (A |^ k,l) = A |^.. (k + 1)
let A be Subset of (E ^omega ); :: thesis: for k, l being Nat st k <= l holds
(A + ) ^^ (A |^ k,l) = A |^.. (k + 1)
let k, l be Nat; :: thesis: ( k <= l implies (A + ) ^^ (A |^ k,l) = A |^.. (k + 1) )
assume k <= l ; :: thesis: (A + ) ^^ (A |^ k,l) = A |^.. (k + 1)
then (A |^.. 1) ^^ (A |^ k,l) = A |^.. (1 + k) by Th33;
hence (A + ) ^^ (A |^ k,l) = A |^.. (k + 1) by Th50; :: thesis: verum