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Theorem cardsdomel 9133
 Description: A cardinal strictly dominates its members. Equivalent to Proposition 10.37 of [TakeutiZaring] p. 93. (Contributed by Mario Carneiro, 15-Jan-2013.) (Revised by Mario Carneiro, 4-Jun-2015.)
Assertion
Ref Expression
cardsdomel ((𝐴 ∈ On ∧ 𝐵 ∈ dom card) → (𝐴𝐵𝐴 ∈ (card‘𝐵)))

Proof of Theorem cardsdomel
StepHypRef Expression
1 cardid2 9112 . . . . . . 7 (𝐵 ∈ dom card → (card‘𝐵) ≈ 𝐵)
21ensymd 8292 . . . . . 6 (𝐵 ∈ dom card → 𝐵 ≈ (card‘𝐵))
3 sdomentr 8382 . . . . . 6 ((𝐴𝐵𝐵 ≈ (card‘𝐵)) → 𝐴 ≺ (card‘𝐵))
42, 3sylan2 586 . . . . 5 ((𝐴𝐵𝐵 ∈ dom card) → 𝐴 ≺ (card‘𝐵))
5 ssdomg 8287 . . . . . . . 8 (𝐴 ∈ On → ((card‘𝐵) ⊆ 𝐴 → (card‘𝐵) ≼ 𝐴))
6 cardon 9103 . . . . . . . . 9 (card‘𝐵) ∈ On
7 domtriord 8394 . . . . . . . . 9 (((card‘𝐵) ∈ On ∧ 𝐴 ∈ On) → ((card‘𝐵) ≼ 𝐴 ↔ ¬ 𝐴 ≺ (card‘𝐵)))
86, 7mpan 680 . . . . . . . 8 (𝐴 ∈ On → ((card‘𝐵) ≼ 𝐴 ↔ ¬ 𝐴 ≺ (card‘𝐵)))
95, 8sylibd 231 . . . . . . 7 (𝐴 ∈ On → ((card‘𝐵) ⊆ 𝐴 → ¬ 𝐴 ≺ (card‘𝐵)))
109con2d 132 . . . . . 6 (𝐴 ∈ On → (𝐴 ≺ (card‘𝐵) → ¬ (card‘𝐵) ⊆ 𝐴))
11 ontri1 6010 . . . . . . . 8 (((card‘𝐵) ∈ On ∧ 𝐴 ∈ On) → ((card‘𝐵) ⊆ 𝐴 ↔ ¬ 𝐴 ∈ (card‘𝐵)))
126, 11mpan 680 . . . . . . 7 (𝐴 ∈ On → ((card‘𝐵) ⊆ 𝐴 ↔ ¬ 𝐴 ∈ (card‘𝐵)))
1312con2bid 346 . . . . . 6 (𝐴 ∈ On → (𝐴 ∈ (card‘𝐵) ↔ ¬ (card‘𝐵) ⊆ 𝐴))
1410, 13sylibrd 251 . . . . 5 (𝐴 ∈ On → (𝐴 ≺ (card‘𝐵) → 𝐴 ∈ (card‘𝐵)))
154, 14syl5 34 . . . 4 (𝐴 ∈ On → ((𝐴𝐵𝐵 ∈ dom card) → 𝐴 ∈ (card‘𝐵)))
1615expcomd 408 . . 3 (𝐴 ∈ On → (𝐵 ∈ dom card → (𝐴𝐵𝐴 ∈ (card‘𝐵))))
1716imp 397 . 2 ((𝐴 ∈ On ∧ 𝐵 ∈ dom card) → (𝐴𝐵𝐴 ∈ (card‘𝐵)))
18 cardsdomelir 9132 . 2 (𝐴 ∈ (card‘𝐵) → 𝐴𝐵)
1917, 18impbid1 217 1 ((𝐴 ∈ On ∧ 𝐵 ∈ dom card) → (𝐴𝐵𝐴 ∈ (card‘𝐵)))
 Colors of variables: wff setvar class Syntax hints:  ¬ wn 3   → wi 4   ↔ wb 198   ∧ wa 386   ∈ wcel 2106   ⊆ wss 3791   class class class wbr 4886  dom cdm 5355  Oncon0 5976  ‘cfv 6135   ≈ cen 8238   ≼ cdom 8239   ≺ csdm 8240  cardccrd 9094 This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1839  ax-4 1853  ax-5 1953  ax-6 2021  ax-7 2054  ax-8 2108  ax-9 2115  ax-10 2134  ax-11 2149  ax-12 2162  ax-13 2333  ax-ext 2753  ax-sep 5017  ax-nul 5025  ax-pow 5077  ax-pr 5138  ax-un 7226 This theorem depends on definitions:  df-bi 199  df-an 387  df-or 837  df-3or 1072  df-3an 1073  df-tru 1605  df-ex 1824  df-nf 1828  df-sb 2012  df-mo 2550  df-eu 2586  df-clab 2763  df-cleq 2769  df-clel 2773  df-nfc 2920  df-ne 2969  df-ral 3094  df-rex 3095  df-rab 3098  df-v 3399  df-sbc 3652  df-dif 3794  df-un 3796  df-in 3798  df-ss 3805  df-pss 3807  df-nul 4141  df-if 4307  df-pw 4380  df-sn 4398  df-pr 4400  df-tp 4402  df-op 4404  df-uni 4672  df-int 4711  df-br 4887  df-opab 4949  df-mpt 4966  df-tr 4988  df-id 5261  df-eprel 5266  df-po 5274  df-so 5275  df-fr 5314  df-we 5316  df-xp 5361  df-rel 5362  df-cnv 5363  df-co 5364  df-dm 5365  df-rn 5366  df-res 5367  df-ima 5368  df-ord 5979  df-on 5980  df-iota 6099  df-fun 6137  df-fn 6138  df-f 6139  df-f1 6140  df-fo 6141  df-f1o 6142  df-fv 6143  df-er 8026  df-en 8242  df-dom 8243  df-sdom 8244  df-card 9098 This theorem is referenced by:  iscard  9134  cardval2  9150  infxpenlem  9169  alephnbtwn  9227  alephnbtwn2  9228  alephord2  9232  alephsdom  9242  pwsdompw  9361  inaprc  9993
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