let T be non empty RelStr ; :: thesis: for A, B being Subset of T
for n being Element of NAT holds (Fint (A,n)) /\ (Fint (B,n)) = (Fcl (((A /\ B) `),n)) `
let A, B be Subset of T; :: thesis: for n being Element of NAT holds (Fint (A,n)) /\ (Fint (B,n)) = (Fcl (((A /\ B) `),n)) `
let n be Element of NAT ; :: thesis: (Fint (A,n)) /\ (Fint (B,n)) = (Fcl (((A /\ B) `),n)) `
(Fint (A,n)) /\ (Fint (B,n)) = Fint ((A /\ B),n) by Th22
.= (Fcl (((A /\ B) `),n)) ` by Th28 ;
hence (Fint (A,n)) /\ (Fint (B,n)) = (Fcl (((A /\ B) `),n)) ` ; :: thesis: verum