let N be non empty with_non-empty_elements set ; :: thesis: for S being non empty stored-program IC-Ins-separated definite COM-Struct of N holds (card (Stop S)) -' 1 = 0
let S be non empty stored-program IC-Ins-separated definite COM-Struct of N; :: thesis: (card (Stop S)) -' 1 = 0
thus (card (Stop S)) -' 1 = (card (Stop S)) - 1 by PRE_CIRC:25
.= 1 - 1 by Th25
.= 0 ; :: thesis: verum