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Theorem inf3lem4 3467
Description: Lemma for our Axiom of Infinity => standard Axiom of Infinity. See inf3 3471 for detailed description.
Hypotheses
Ref Expression
inf3lem.1 |- G = {<.y, z>. | z = {w e. x | (w i^i x) (_ y}}
inf3lem.2 |- F = (rec(G, (/)) |` om)
inf3lem.3 |- A e. V
inf3lem.4 |- B e. V
Assertion
Ref Expression
inf3lem4 |- ((-. x = (/) /\ x (_ U.x) -> (A e. om -> (F` A) (. (F` suc A)))
Distinct variable group(s):   x,y,z,w

Proof of Theorem inf3lem4
StepHypRef Expression
1 inf3lem.1 . . . . 5 |- G = {<.y, z>. | z = {w e. x | (w i^i x) (_ y}}
2 inf3lem.2 . . . . 5 |- F = (rec(G, (/)) |` om)
3 inf3lem.3 . . . . 5 |- A e. V
4 inf3lem.4 . . . . 5 |- B e. V
51, 2, 3, 4inf3lem1 3464 . . . 4 |- (A e. om -> (F` A) (_ (F` suc A))
65a1i 7 . . 3 |- ((-. x = (/) /\ x (_ U.x) -> (A e. om -> (F` A) (_ (F` suc A)))
71, 2, 3, 4inf3lem3 3466 . . 3 |- ((-. x = (/) /\ x (_ U.x) -> (A e. om -> -. (F` A) = (F` suc A)))
86, 7jcad 455 . 2 |- ((-. x = (/) /\ x (_ U.x) -> (A e. om -> ((F` A) (_ (F` suc A) /\ -. (F` A) = (F` suc A))))
9 dfpss2 1557 . 2 |- ((F` A) (. (F` suc A) <-> ((F` A) (_ (F` suc A) /\ -. (F` A) = (F` suc A)))
108, 9syl6ibr 186 1 |- ((-. x = (/) /\ x (_ U.x) -> (A e. om -> (F` A) (. (F` suc A)))
Colors of variables: wff set class
Syntax hints:  -. wn 1   -> wi 2   /\ wa 196   = wceq 1091   e. wcel 1092  {crab 1204  Vcvv 1348   i^i cin 1486   (_ wss 1487   (. wpss 1488  (/)c0 1707  U.cuni 1919  {copab 2055  suc csuc 2201  omcom 2372   |` cres 2412  ` cfv 2422  reccrdg 2969
This theorem is referenced by:  inf3lem5 3468
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-un 1076  ax-pow 1077  ax-reg 1078
This theorem depends on definitions:  df-bi 128  df-or 197  df-an 198  df-3or 582  df-3an 583  df-ex 679  df-sb 853  df-eu 1009  df-mo 1010  df-clab 1093  df-cleq 1097  df-clel 1099  df-ne 1192  df-ral 1205  df-rex 1206  df-rab 1208  df-v 1349  df-sbc 1441  df-dif 1489  df-un 1490  df-in 1491  df-ss 1492  df-pss 1494  df-nul 1708  df-if 1777  df-pw 1799  df-sn 1811  df-pr 1812  df-tp 1814  df-op 1815  df-uni 1920  df-tr 2042  df-br 2063  df-opab 2098  df-eprel 2122  df-id 2125  df-po 2128  df-so 2138  df-fr 2169  df-we 2186  df-ord 2202  df-on 2203  df-lim 2204  df-suc 2205  df-om 2373  df-xp 2424  df-rel 2425  df-cnv 2426  df-co 2427  df-dm 2428  df-rn 2429  df-res 2430  df-ima 2431  df-fun 2432  df-fn 2433  df-fv 2438  df-rdg 2970
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