let F be Field; :: thesis: for V being VectSp of F
for l being Linear_Combination of V
for X being Subset of V st X misses Carrier l holds
l .: X c= {(0. F)}

let V be VectSp of F; :: thesis: for l being Linear_Combination of V
for X being Subset of V st X misses Carrier l holds
l .: X c= {(0. F)}

let l be Linear_Combination of V; :: thesis: for X being Subset of V st X misses Carrier l holds
l .: X c= {(0. F)}

let X be Subset of V; :: thesis: ( X misses Carrier l implies l .: X c= {(0. F)} )
assume A1: X misses Carrier l ; :: thesis: l .: X c= {(0. F)}
set M = l .: X;
let y be object ; :: according to TARSKI:def 3 :: thesis: ( not y in l .: X or y in {(0. F)} )
assume y in l .: X ; :: thesis: y in {(0. F)}
then consider x being object such that
A2: x in dom l and
A3: x in X and
A4: y = l . x by FUNCT_1:def 6;
reconsider x = x as Element of V by A2;
now :: thesis: not l . x <> 0. F
assume l . x <> 0. F ; :: thesis: contradiction
then x in Carrier l ;
then x in () /\ X by ;
hence contradiction by A1; :: thesis: verum
end;
hence y in {(0. F)} by ; :: thesis: verum