let T be non empty RelStr ; :: thesis: for A, B being Subset of T
for n being Element of NAT holds (Fdfl A,n) /\ (Fdfl B,n) = (Finf ((A /\ B) ` ),n) `
let A, B be Subset of T; :: thesis: for n being Element of NAT holds (Fdfl A,n) /\ (Fdfl B,n) = (Finf ((A /\ B) ` ),n) `
let n be Element of NAT ; :: thesis: (Fdfl A,n) /\ (Fdfl B,n) = (Finf ((A /\ B) ` ),n) `
(Fdfl A,n) /\ (Fdfl B,n) = Fdfl (A /\ B),n by Th42
.= (Finf ((A /\ B) ` ),n) ` by Th45 ;
hence (Fdfl A,n) /\ (Fdfl B,n) = (Finf ((A /\ B) ` ),n) ` ; :: thesis: verum