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Theorem gruen 9922
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 8204 . . . . 5 (𝐵𝐴 ↔ ∃𝑦 𝑦:𝐵1-1-onto𝐴)
2 f1ofo 6363 . . . . . . . . 9 (𝑦:𝐵1-1-onto𝐴𝑦:𝐵onto𝐴)
3 simp3l 1259 . . . . . . . . . . . . 13 ((𝑈 ∈ Univ ∧ 𝐵𝑈 ∧ (𝑦:𝐵onto𝐴𝐴𝑈)) → 𝑦:𝐵onto𝐴)
4 forn 6334 . . . . . . . . . . . . 13 (𝑦:𝐵onto𝐴 → ran 𝑦 = 𝐴)
53, 4syl 17 . . . . . . . . . . . 12 ((𝑈 ∈ Univ ∧ 𝐵𝑈 ∧ (𝑦:𝐵onto𝐴𝐴𝑈)) → ran 𝑦 = 𝐴)
6 fof 6331 . . . . . . . . . . . . . 14 (𝑦:𝐵onto𝐴𝑦:𝐵𝐴)
7 fss 6269 . . . . . . . . . . . . . 14 ((𝑦:𝐵𝐴𝐴𝑈) → 𝑦:𝐵𝑈)
86, 7sylan 576 . . . . . . . . . . . . 13 ((𝑦:𝐵onto𝐴𝐴𝑈) → 𝑦:𝐵𝑈)
9 grurn 9911 . . . . . . . . . . . . 13 ((𝑈 ∈ Univ ∧ 𝐵𝑈𝑦:𝐵𝑈) → ran 𝑦𝑈)
108, 9syl3an3 1206 . . . . . . . . . . . 12 ((𝑈 ∈ Univ ∧ 𝐵𝑈 ∧ (𝑦:𝐵onto𝐴𝐴𝑈)) → ran 𝑦𝑈)
115, 10eqeltrrd 2879 . . . . . . . . . . 11 ((𝑈 ∈ Univ ∧ 𝐵𝑈 ∧ (𝑦:𝐵onto𝐴𝐴𝑈)) → 𝐴𝑈)
12113expia 1151 . . . . . . . . . 10 ((𝑈 ∈ Univ ∧ 𝐵𝑈) → ((𝑦:𝐵onto𝐴𝐴𝑈) → 𝐴𝑈))
1312expd 405 . . . . . . . . 9 ((𝑈 ∈ Univ ∧ 𝐵𝑈) → (𝑦:𝐵onto𝐴 → (𝐴𝑈𝐴𝑈)))
142, 13syl5 34 . . . . . . . 8 ((𝑈 ∈ Univ ∧ 𝐵𝑈) → (𝑦:𝐵1-1-onto𝐴 → (𝐴𝑈𝐴𝑈)))
1514exlimdv 2029 . . . . . . 7 ((𝑈 ∈ Univ ∧ 𝐵𝑈) → (∃𝑦 𝑦:𝐵1-1-onto𝐴 → (𝐴𝑈𝐴𝑈)))
1615com3r 87 . . . . . 6 (𝐴𝑈 → ((𝑈 ∈ Univ ∧ 𝐵𝑈) → (∃𝑦 𝑦:𝐵1-1-onto𝐴𝐴𝑈)))
1716expdimp 445 . . . . 5 ((𝐴𝑈𝑈 ∈ Univ) → (𝐵𝑈 → (∃𝑦 𝑦:𝐵1-1-onto𝐴𝐴𝑈)))
181, 17syl7bi 247 . . . 4 ((𝐴𝑈𝑈 ∈ Univ) → (𝐵𝑈 → (𝐵𝐴𝐴𝑈)))
1918impd 399 . . 3 ((𝐴𝑈𝑈 ∈ Univ) → ((𝐵𝑈𝐵𝐴) → 𝐴𝑈))
2019ancoms 451 . 2 ((𝑈 ∈ Univ ∧ 𝐴𝑈) → ((𝐵𝑈𝐵𝐴) → 𝐴𝑈))
21203impia 1146 1 ((𝑈 ∈ Univ ∧ 𝐴𝑈 ∧ (𝐵𝑈𝐵𝐴)) → 𝐴𝑈)
Colors of variables: wff setvar class
Syntax hints:  wi 4  wa 385  w3a 1108   = wceq 1653  wex 1875  wcel 2157  wss 3769   class class class wbr 4843  ran crn 5313  wf 6097  ontowfo 6099  1-1-ontowf1o 6100  cen 8192  Univcgru 9900
This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1891  ax-4 1905  ax-5 2006  ax-6 2072  ax-7 2107  ax-8 2159  ax-9 2166  ax-10 2185  ax-11 2200  ax-12 2213  ax-13 2377  ax-ext 2777  ax-sep 4975  ax-nul 4983  ax-pow 5035  ax-pr 5097  ax-un 7183
This theorem depends on definitions:  df-bi 199  df-an 386  df-or 875  df-3an 1110  df-tru 1657  df-ex 1876  df-nf 1880  df-sb 2065  df-mo 2591  df-eu 2609  df-clab 2786  df-cleq 2792  df-clel 2795  df-nfc 2930  df-ral 3094  df-rex 3095  df-rab 3098  df-v 3387  df-sbc 3634  df-dif 3772  df-un 3774  df-in 3776  df-ss 3783  df-nul 4116  df-if 4278  df-pw 4351  df-sn 4369  df-pr 4371  df-op 4375  df-uni 4629  df-br 4844  df-opab 4906  df-tr 4946  df-id 5220  df-xp 5318  df-rel 5319  df-cnv 5320  df-co 5321  df-dm 5322  df-rn 5323  df-iota 6064  df-fun 6103  df-fn 6104  df-f 6105  df-f1 6106  df-fo 6107  df-f1o 6108  df-fv 6109  df-ov 6881  df-oprab 6882  df-mpt2 6883  df-map 8097  df-en 8196  df-gru 9901
This theorem is referenced by:  grudomon  9927  gruina  9928
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