let E be set ; :: thesis: for A being Subset of (E ^omega) holds A |^ (0,1) = {(<%> E)} \/ A
let A be Subset of (E ^omega); :: thesis: A |^ (0,1) = {(<%> E)} \/ A
thus A |^ (0,1) = (A |^ 0) \/ (A |^ (0 + 1)) by Th28
.= {(<%> E)} \/ (A |^ 1) by FLANG_1:24
.= {(<%> E)} \/ A by FLANG_1:25 ; :: thesis: verum