let X be non empty set ; :: thesis: for S being SigmaField of X
for M being sigma_Measure of S
for f, g being PartFunc of ,
for v, u being VECTOR of st f = v & g = u holds
f + g = v + u
let S be SigmaField of X; :: thesis: for M being sigma_Measure of S
for f, g being PartFunc of ,
for v, u being VECTOR of st f = v & g = u holds
f + g = v + u
let M be sigma_Measure of S; :: thesis: for f, g being PartFunc of ,
for v, u being VECTOR of st f = v & g = u holds
f + g = v + u
let f, g be PartFunc of ,; :: thesis: for v, u being VECTOR of st f = v & g = u holds
f + g = v + u
let v, u be VECTOR of ; :: thesis: ( f = v & g = u implies f + g = v + u )
assume A1: ( f = v & g = u ) ; :: thesis: f + g = v + u
reconsider v2 = v, u2 = u as VECTOR of by TARSKI:def 3;
thus v + u = v2 + u2 by Th4
.= f + g by A1, Th25 ; :: thesis: verum