let i be Nat; :: thesis: for R1, R being i -element FinSequence of COMPLEX holds R1 = (R1 - R) + R
let R1, R be i -element FinSequence of COMPLEX ; :: thesis: R1 = (R1 - R) + R
thus R1 = R1 + (i |-> 0c) by BINOP_2:1, FINSEQOP:56
.= R1 + ((- R) + R) by BINOP_2:1, FINSEQOP:73, SEQ_4:51, SEQ_4:52
.= (R1 - R) + R by FINSEQOP:28 ; :: thesis: verum