let GF be non empty right_complementable well-unital distributive Abelian add-associative right_zeroed associative doubleLoopStr ; :: thesis: for V being non empty right_complementable vector-distributive scalar-distributive scalar-associative scalar-unital Abelian add-associative right_zeroed ModuleStr over GF
for L being Linear_Combination of V holds L - L = ZeroLC V
let V be non empty right_complementable vector-distributive scalar-distributive scalar-associative scalar-unital Abelian add-associative right_zeroed ModuleStr over GF; :: thesis: for L being Linear_Combination of V holds L - L = ZeroLC V
let L be Linear_Combination of V; :: thesis: L - L = ZeroLC V
let v be Element of V; :: according to VECTSP_6:def 7 :: thesis: (L - L) . v = (ZeroLC V) . v
thus (L - L) . v = (L . v) - (L . v) by Th40
.= 0. GF by RLVECT_1:15
.= (ZeroLC V) . v by Th3 ; :: thesis: verum