theorem Th22: :: ZMODUL02:22

for R being Ring
for V being LeftMod of R
for v1, v2 being Vector of V st v1 <> v2 holds
for l being Linear_Combination of {v1,v2} holds Sum l = ((l . v1) * v1) + ((l . v2) * v2) by VECTSP_6:18;