let f be FinSequence of (TOP-REAL 2); for p being Point of (TOP-REAL 2) st p in L~ f holds
(R_Cut f,p) /. (len (R_Cut f,p)) = p
let p be Point of (TOP-REAL 2); ( p in L~ f implies (R_Cut f,p) /. (len (R_Cut f,p)) = p )
assume A1:
p in L~ f
; (R_Cut f,p) /. (len (R_Cut f,p)) = p
not R_Cut f,p is empty
by Th44;
then
len (R_Cut f,p) in dom (R_Cut f,p)
by FINSEQ_5:6;
hence (R_Cut f,p) /. (len (R_Cut f,p)) =
(R_Cut f,p) . (len (R_Cut f,p))
by PARTFUN1:def 8
.=
p
by A1, JORDAN3:59
;
verum