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Theorem supsrlem4 5228
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 groups:   w,A   w,B   w,C

Proof of Theorem supsrlem4
StepHypRef Expression
1 supsrlem4.1 . 2 |- D e. V
2 opreq1 3968 . . . 4 |- (x = D -> (x +R -1R) = (D +R -1R))
32opreq2d 3976 . . 3 |- (x = D -> (C +R (x +R -1R)) = (C +R (D +R -1R)))
43eleq1d 1540 . 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 3968 . . . . . 6 |- (w = x -> (w +R -1R) = (x +R -1R))
76opreq2d 3976 . . . . 5 |- (w = x -> (C +R (w +R -1R)) = (C +R (x +R -1R)))
87eleq1d 1540 . . . 4 |- (w = x -> ((C +R (w +R -1R)) e. A <-> (C +R (x +R -1R)) e. A))
98cbvabv 1909 . . 3 |- {w | (C +R (w +R -1R)) e. A} = {x | (C +R (x +R -1R)) e. A}
105, 9eqtr 1495 . 2 |- B = {x | (C +R (x +R -1R)) e. A}
111, 4, 10elab2 1901 1 |- (D e. B <-> (C +R (D +R -1R)) e. A)
Colors of variables: wff set class
Syntax hints:   <-> wb 146   = wceq 956   e. wcel 958  {cab 1463  Vcvv 1811  (class class class)co 3963  R.cnr 4993  -1Rcm1r 4996   +R cplr 4997
This theorem is referenced by:  supsrlem5 5229  supsrlem6 5230
This theorem was proved from axioms:  ax-1 4  ax-2 5  ax-3 6  ax-mp 7  ax-7 962  ax-gen 963  ax-8 964  ax-10 966  ax-11 967  ax-12 968  ax-13 969  ax-14 970  ax-17 971  ax-4 973  ax-5o 975  ax-6o 978  ax-9o 1123  ax-10o 1140  ax-16 1210  ax-11o 1218  ax-ext 1459  ax-sep 2703  ax-pow 2742  ax-pr 2779
This theorem depends on definitions:  df-bi 147  df-or 224  df-an 225  df-ex 981  df-sb 1172  df-eu 1382  df-mo 1383  df-clab 1464  df-cleq 1469  df-clel 1472  df-ne 1587  df-v 1812  df-dif 2049  df-un 2050  df-in 2051  df-ss 2053  df-nul 2281  df-pw 2402  df-sn 2412  df-pr 2413  df-op 2416  df-uni 2504  df-br 2620  df-opab 2667  df-xp 3184  df-cnv 3186  df-dm 3188  df-rn 3189  df-res 3190  df-ima 3191  df-fv 3198  df-opr 3965
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