MPE Home Metamath Proof Explorer < Previous   Next >
Nearby theorems
Mirrors  >  Home  >  MPE Home  >  Th. List  >  cardsdomel Structured version   Visualization version   GIF version

Theorem cardsdomel 8785
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 8764 . . . . . . 7 (𝐵 ∈ dom card → (card‘𝐵) ≈ 𝐵)
21ensymd 7992 . . . . . 6 (𝐵 ∈ dom card → 𝐵 ≈ (card‘𝐵))
3 sdomentr 8079 . . . . . 6 ((𝐴𝐵𝐵 ≈ (card‘𝐵)) → 𝐴 ≺ (card‘𝐵))
42, 3sylan2 491 . . . . 5 ((𝐴𝐵𝐵 ∈ dom card) → 𝐴 ≺ (card‘𝐵))
5 ssdomg 7986 . . . . . . . 8 (𝐴 ∈ On → ((card‘𝐵) ⊆ 𝐴 → (card‘𝐵) ≼ 𝐴))
6 cardon 8755 . . . . . . . . 9 (card‘𝐵) ∈ On
7 domtriord 8091 . . . . . . . . 9 (((card‘𝐵) ∈ On ∧ 𝐴 ∈ On) → ((card‘𝐵) ≼ 𝐴 ↔ ¬ 𝐴 ≺ (card‘𝐵)))
86, 7mpan 705 . . . . . . . 8 (𝐴 ∈ On → ((card‘𝐵) ≼ 𝐴 ↔ ¬ 𝐴 ≺ (card‘𝐵)))
95, 8sylibd 229 . . . . . . 7 (𝐴 ∈ On → ((card‘𝐵) ⊆ 𝐴 → ¬ 𝐴 ≺ (card‘𝐵)))
109con2d 129 . . . . . 6 (𝐴 ∈ On → (𝐴 ≺ (card‘𝐵) → ¬ (card‘𝐵) ⊆ 𝐴))
11 ontri1 5745 . . . . . . . 8 (((card‘𝐵) ∈ On ∧ 𝐴 ∈ On) → ((card‘𝐵) ⊆ 𝐴 ↔ ¬ 𝐴 ∈ (card‘𝐵)))
126, 11mpan 705 . . . . . . 7 (𝐴 ∈ On → ((card‘𝐵) ⊆ 𝐴 ↔ ¬ 𝐴 ∈ (card‘𝐵)))
1312con2bid 344 . . . . . 6 (𝐴 ∈ On → (𝐴 ∈ (card‘𝐵) ↔ ¬ (card‘𝐵) ⊆ 𝐴))
1410, 13sylibrd 249 . . . . 5 (𝐴 ∈ On → (𝐴 ≺ (card‘𝐵) → 𝐴 ∈ (card‘𝐵)))
154, 14syl5 34 . . . 4 (𝐴 ∈ On → ((𝐴𝐵𝐵 ∈ dom card) → 𝐴 ∈ (card‘𝐵)))
1615expcomd 454 . . 3 (𝐴 ∈ On → (𝐵 ∈ dom card → (𝐴𝐵𝐴 ∈ (card‘𝐵))))
1716imp 445 . 2 ((𝐴 ∈ On ∧ 𝐵 ∈ dom card) → (𝐴𝐵𝐴 ∈ (card‘𝐵)))
18 cardsdomelir 8784 . 2 (𝐴 ∈ (card‘𝐵) → 𝐴𝐵)
1917, 18impbid1 215 1 ((𝐴 ∈ On ∧ 𝐵 ∈ dom card) → (𝐴𝐵𝐴 ∈ (card‘𝐵)))
Colors of variables: wff setvar class
Syntax hints:  ¬ wn 3  wi 4  wb 196  wa 384  wcel 1988  wss 3567   class class class wbr 4644  dom cdm 5104  Oncon0 5711  cfv 5876  cen 7937  cdom 7938  csdm 7939  cardccrd 8746
This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1720  ax-4 1735  ax-5 1837  ax-6 1886  ax-7 1933  ax-8 1990  ax-9 1997  ax-10 2017  ax-11 2032  ax-12 2045  ax-13 2244  ax-ext 2600  ax-sep 4772  ax-nul 4780  ax-pow 4834  ax-pr 4897  ax-un 6934
This theorem depends on definitions:  df-bi 197  df-or 385  df-an 386  df-3or 1037  df-3an 1038  df-tru 1484  df-ex 1703  df-nf 1708  df-sb 1879  df-eu 2472  df-mo 2473  df-clab 2607  df-cleq 2613  df-clel 2616  df-nfc 2751  df-ne 2792  df-ral 2914  df-rex 2915  df-rab 2918  df-v 3197  df-sbc 3430  df-dif 3570  df-un 3572  df-in 3574  df-ss 3581  df-pss 3583  df-nul 3908  df-if 4078  df-pw 4151  df-sn 4169  df-pr 4171  df-tp 4173  df-op 4175  df-uni 4428  df-int 4467  df-br 4645  df-opab 4704  df-mpt 4721  df-tr 4744  df-id 5014  df-eprel 5019  df-po 5025  df-so 5026  df-fr 5063  df-we 5065  df-xp 5110  df-rel 5111  df-cnv 5112  df-co 5113  df-dm 5114  df-rn 5115  df-res 5116  df-ima 5117  df-ord 5714  df-on 5715  df-iota 5839  df-fun 5878  df-fn 5879  df-f 5880  df-f1 5881  df-fo 5882  df-f1o 5883  df-fv 5884  df-er 7727  df-en 7941  df-dom 7942  df-sdom 7943  df-card 8750
This theorem is referenced by:  iscard  8786  cardval2  8802  infxpenlem  8821  alephnbtwn  8879  alephnbtwn2  8880  alephord2  8884  alephsdom  8894  pwsdompw  9011  inaprc  9643
  Copyright terms: Public domain W3C validator