:: deftheorem Def6 defines # ZMODUL05:def 9 :
for R being Ring
for V, W being LeftMod of R
for X being Subset of V
for T being linear-transformation of V,W
for l being Linear_Combination of T .: X st T | X is one-to-one holds
T # l = (l * T) +* ((X `) --> (0. R));