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Theorem rdglim2a 2988
Description: The value of the recursive definition generator at a limit ordinal, in terms of indexed union of all smaller values.
Assertion
Ref Expression
rdglim2a |- ((B e. C /\ Lim B) -> (rec(F, A)` B) = U.x e. B (rec(F, A)` x))
Distinct variable group(s):   x,A   x,B   x,F

Proof of Theorem rdglim2a
StepHypRef Expression
1 rdglim2 2987 . 2 |- ((B e. C /\ Lim B) -> (rec(F, A)` B) = U.{y | E.x e. B y = (rec(F, A)` x)})
2 fvex 2838 . . 3 |- (rec(F, A)` x) e. V
32dfiun2 2014 . 2 |- U.x e. B (rec(F, A)` x) = U.{y | E.x e. B y = (rec(F, A)` x)}
41, 3syl6eqr 1142 1 |- ((B e. C /\ Lim B) -> (rec(F, A)` B) = U.x e. B (rec(F, A)` x))
Colors of variables: wff set class
Syntax hints:   -> wi 2   /\ wa 196  {cab 1090   = wceq 1091   e. wcel 1092  E.wrex 1202  U.cuni 1919  U.ciun 1994  Lim wlim 2200  ` cfv 2422  reccrdg 2969
This theorem is referenced by:  abianfplem 2999  oalim 3135  omlim 3136  oelim 3137  r1lim 3497  alephlim 3670
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
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-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-nul 1708  df-if 1777  df-pw 1799  df-sn 1811  df-pr 1812  df-tp 1814  df-op 1815  df-uni 1920  df-iun 1996  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-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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