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Theorem supsrlem4 4022
Description: Lemma for supremum theorem.
Hypotheses
Ref Expression
supsrlem.1 |- C e. R.
supsrlem.2 |- B = {w | (C +R (w +R -1R)) e. A}
supsrlem4.1 |- D e. V
Assertion
Ref Expression
supsrlem4 |- (D e. B <-> (C +R (D +R -1R)) e. A)
Distinct variable group(s):   w,A   w,B   w,C

Proof of Theorem supsrlem4
StepHypRef Expression
1 supsrlem4.1 . 2 |- D e. V
2 opreq1 3006 . . . 4 |- (x = D -> (x +R -1R) = (D +R -1R))
32opreq2d 3013 . . 3 |- (x = D -> (C +R (x +R -1R)) = (C +R (D +R -1R)))
43eleq1d 1155 . 2 |- (x = D -> ((C +R (x +R -1R)) e. A <-> (C +R (D +R -1R)) e. A))
5 supsrlem.2 . . 3 |- B = {w | (C +R (w +R -1R)) e. A}
6 opreq1 3006 . . . . . 6 |- (w = x -> (w +R -1R) = (x +R -1R))
76opreq2d 3013 . . . . 5 |- (w = x -> (C +R (w +R -1R)) = (C +R (x +R -1R)))
87eleq1d 1155 . . . 4 |- (w = x -> ((C +R (w +R -1R)) e. A <-> (C +R (x +R -1R)) e. A))
98cbvabv 1424 . . 3 |- {w | (C +R (w +R -1R)) e. A} = {x | (C +R (x +R -1R)) e. A}
105, 9eqtr 1119 . 2 |- B = {x | (C +R (x +R -1R)) e. A}
111, 4, 10elab2 1419 1 |- (D e. B <-> (C +R (D +R -1R)) e. A)
Colors of variables: wff set class
Syntax hints:   <-> wb 127   = weq 797  {cab 1090   = wceq 1091   e. wcel 1092  Vcvv 1348  (class class class)co 3001  R.cnr 3787  -1Rcm1r 3790   +R cplr 3791
This theorem is referenced by:  supsrlem5 4023  supsrlem6 4024
This theorem was proved from axioms:  ax-1 3  ax-2 4  ax-3 5  ax-mp 6  ax-4 673  ax-5 674  ax-6 675  ax-7 676  ax-gen 677  ax-8 798  ax-9 799  ax-10 800  ax-11 801  ax-12 802  ax-13 804  ax-14 805  ax-16 922  ax-17 925  ax-ext 1074  ax-rep 1075  ax-pow 1077
This theorem depends on definitions:  df-bi 128  df-or 197  df-an 198  df-ex 679  df-sb 853  df-clab 1093  df-cleq 1097  df-clel 1099  df-v 1349  df-dif 1489  df-un 1490  df-in 1491  df-ss 1492  df-nul 1708  df-pw 1799  df-sn 1811  df-pr 1812  df-op 1815  df-uni 1920  df-br 2063  df-opab 2098  df-xp 2424  df-cnv 2426  df-dm 2428  df-rn 2429  df-res 2430  df-ima 2431  df-fv 2438  df-opr 3003
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