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Theorem gruen 10226
Description: A Grothendieck universe contains all subsets of itself that are equipotent to an element of the universe. (Contributed by Mario Carneiro, 9-Jun-2013.)
Assertion
Ref Expression
gruen ((𝑈 ∈ Univ ∧ 𝐴𝑈 ∧ (𝐵𝑈𝐵𝐴)) → 𝐴𝑈)

Proof of Theorem gruen
Dummy variable 𝑦 is distinct from all other variables.
StepHypRef Expression
1 bren 8510 . . . . 5 (𝐵𝐴 ↔ ∃𝑦 𝑦:𝐵1-1-onto𝐴)
2 f1ofo 6615 . . . . . . . . 9 (𝑦:𝐵1-1-onto𝐴𝑦:𝐵onto𝐴)
3 simp3l 1196 . . . . . . . . . . . . 13 ((𝑈 ∈ Univ ∧ 𝐵𝑈 ∧ (𝑦:𝐵onto𝐴𝐴𝑈)) → 𝑦:𝐵onto𝐴)
4 forn 6586 . . . . . . . . . . . . 13 (𝑦:𝐵onto𝐴 → ran 𝑦 = 𝐴)
53, 4syl 17 . . . . . . . . . . . 12 ((𝑈 ∈ Univ ∧ 𝐵𝑈 ∧ (𝑦:𝐵onto𝐴𝐴𝑈)) → ran 𝑦 = 𝐴)
6 fof 6583 . . . . . . . . . . . . . 14 (𝑦:𝐵onto𝐴𝑦:𝐵𝐴)
7 fss 6520 . . . . . . . . . . . . . 14 ((𝑦:𝐵𝐴𝐴𝑈) → 𝑦:𝐵𝑈)
86, 7sylan 582 . . . . . . . . . . . . 13 ((𝑦:𝐵onto𝐴𝐴𝑈) → 𝑦:𝐵𝑈)
9 grurn 10215 . . . . . . . . . . . . 13 ((𝑈 ∈ Univ ∧ 𝐵𝑈𝑦:𝐵𝑈) → ran 𝑦𝑈)
108, 9syl3an3 1160 . . . . . . . . . . . 12 ((𝑈 ∈ Univ ∧ 𝐵𝑈 ∧ (𝑦:𝐵onto𝐴𝐴𝑈)) → ran 𝑦𝑈)
115, 10eqeltrrd 2912 . . . . . . . . . . 11 ((𝑈 ∈ Univ ∧ 𝐵𝑈 ∧ (𝑦:𝐵onto𝐴𝐴𝑈)) → 𝐴𝑈)
12113expia 1116 . . . . . . . . . 10 ((𝑈 ∈ Univ ∧ 𝐵𝑈) → ((𝑦:𝐵onto𝐴𝐴𝑈) → 𝐴𝑈))
1312expd 418 . . . . . . . . 9 ((𝑈 ∈ Univ ∧ 𝐵𝑈) → (𝑦:𝐵onto𝐴 → (𝐴𝑈𝐴𝑈)))
142, 13syl5 34 . . . . . . . 8 ((𝑈 ∈ Univ ∧ 𝐵𝑈) → (𝑦:𝐵1-1-onto𝐴 → (𝐴𝑈𝐴𝑈)))
1514exlimdv 1928 . . . . . . 7 ((𝑈 ∈ Univ ∧ 𝐵𝑈) → (∃𝑦 𝑦:𝐵1-1-onto𝐴 → (𝐴𝑈𝐴𝑈)))
1615com3r 87 . . . . . 6 (𝐴𝑈 → ((𝑈 ∈ Univ ∧ 𝐵𝑈) → (∃𝑦 𝑦:𝐵1-1-onto𝐴𝐴𝑈)))
1716expdimp 455 . . . . 5 ((𝐴𝑈𝑈 ∈ Univ) → (𝐵𝑈 → (∃𝑦 𝑦:𝐵1-1-onto𝐴𝐴𝑈)))
181, 17syl7bi 257 . . . 4 ((𝐴𝑈𝑈 ∈ Univ) → (𝐵𝑈 → (𝐵𝐴𝐴𝑈)))
1918impd 413 . . 3 ((𝐴𝑈𝑈 ∈ Univ) → ((𝐵𝑈𝐵𝐴) → 𝐴𝑈))
2019ancoms 461 . 2 ((𝑈 ∈ Univ ∧ 𝐴𝑈) → ((𝐵𝑈𝐵𝐴) → 𝐴𝑈))
21203impia 1112 1 ((𝑈 ∈ Univ ∧ 𝐴𝑈 ∧ (𝐵𝑈𝐵𝐴)) → 𝐴𝑈)
Colors of variables: wff setvar class
Syntax hints:  wi 4  wa 398  w3a 1082   = wceq 1531  wex 1774  wcel 2108  wss 3934   class class class wbr 5057  ran crn 5549  wf 6344  ontowfo 6346  1-1-ontowf1o 6347  cen 8498  Univcgru 10204
This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1790  ax-4 1804  ax-5 1905  ax-6 1964  ax-7 2009  ax-8 2110  ax-9 2118  ax-10 2139  ax-11 2154  ax-12 2170  ax-ext 2791  ax-sep 5194  ax-nul 5201  ax-pow 5257  ax-pr 5320  ax-un 7453
This theorem depends on definitions:  df-bi 209  df-an 399  df-or 844  df-3an 1084  df-tru 1534  df-ex 1775  df-nf 1779  df-sb 2064  df-mo 2616  df-eu 2648  df-clab 2798  df-cleq 2812  df-clel 2891  df-nfc 2961  df-ral 3141  df-rex 3142  df-rab 3145  df-v 3495  df-sbc 3771  df-dif 3937  df-un 3939  df-in 3941  df-ss 3950  df-nul 4290  df-if 4466  df-pw 4539  df-sn 4560  df-pr 4562  df-op 4566  df-uni 4831  df-br 5058  df-opab 5120  df-tr 5164  df-id 5453  df-xp 5554  df-rel 5555  df-cnv 5556  df-co 5557  df-dm 5558  df-rn 5559  df-iota 6307  df-fun 6350  df-fn 6351  df-f 6352  df-f1 6353  df-fo 6354  df-f1o 6355  df-fv 6356  df-ov 7151  df-oprab 7152  df-mpo 7153  df-map 8400  df-en 8502  df-gru 10205
This theorem is referenced by:  grudomon  10231  gruina  10232
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