let v be object ; :: thesis: for V, A being set
for d1 being NonatomicND of V,A
for d2 being TypeSCNominativeData of V,A st v in V & v in dom d1 & not d1 in A & not naming (V,A,v,d2) in A holds
dom (local_overlapping (V,A,d1,d2,v)) = dom d1
let V, A be set ; :: thesis: for d1 being NonatomicND of V,A
for d2 being TypeSCNominativeData of V,A st v in V & v in dom d1 & not d1 in A & not naming (V,A,v,d2) in A holds
dom (local_overlapping (V,A,d1,d2,v)) = dom d1
let d1 be NonatomicND of V,A; :: thesis: for d2 being TypeSCNominativeData of V,A st v in V & v in dom d1 & not d1 in A & not naming (V,A,v,d2) in A holds
dom (local_overlapping (V,A,d1,d2,v)) = dom d1
let d2 be TypeSCNominativeData of V,A; :: thesis: ( v in V & v in dom d1 & not d1 in A & not naming (V,A,v,d2) in A implies dom (local_overlapping (V,A,d1,d2,v)) = dom d1 )
assume that
A1: v in V and
A2: v in dom d1 and
A3: ( not d1 in A & not naming (V,A,v,d2) in A ) ; :: thesis: dom (local_overlapping (V,A,d1,d2,v)) = dom d1
set n = naming (V,A,v,d2);
A4: naming (V,A,v,d2) = v .--> d2 by A1, NOMIN_1:def 13;
A5: (dom (naming (V,A,v,d2))) \/ (dom (d1 | ((dom d1) \ (dom (naming (V,A,v,d2)))))) = dom d1 local_overlapping (V,A,d1,d2,v) = (naming (V,A,v,d2)) \/ (d1 | ((dom d1) \ (dom (naming (V,A,v,d2))))) by A3, NOMIN_1:64;
hence dom (local_overlapping (V,A,d1,d2,v)) = dom d1 by A5, XTUPLE_0:23; :: thesis: verum