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Theorem domtri2 9678
Description: Trichotomy of dominance for numerable sets (does not use AC). (Contributed by Mario Carneiro, 29-Apr-2015.)
Assertion
Ref Expression
domtri2 ((𝐴 ∈ dom card ∧ 𝐵 ∈ dom card) → (𝐴𝐵 ↔ ¬ 𝐵𝐴))

Proof of Theorem domtri2
StepHypRef Expression
1 carddom2 9666 . 2 ((𝐴 ∈ dom card ∧ 𝐵 ∈ dom card) → ((card‘𝐴) ⊆ (card‘𝐵) ↔ 𝐴𝐵))
2 cardon 9633 . . . 4 (card‘𝐴) ∈ On
3 cardon 9633 . . . 4 (card‘𝐵) ∈ On
4 ontri1 6285 . . . 4 (((card‘𝐴) ∈ On ∧ (card‘𝐵) ∈ On) → ((card‘𝐴) ⊆ (card‘𝐵) ↔ ¬ (card‘𝐵) ∈ (card‘𝐴)))
52, 3, 4mp2an 688 . . 3 ((card‘𝐴) ⊆ (card‘𝐵) ↔ ¬ (card‘𝐵) ∈ (card‘𝐴))
6 cardsdom2 9677 . . . . 5 ((𝐵 ∈ dom card ∧ 𝐴 ∈ dom card) → ((card‘𝐵) ∈ (card‘𝐴) ↔ 𝐵𝐴))
76ancoms 458 . . . 4 ((𝐴 ∈ dom card ∧ 𝐵 ∈ dom card) → ((card‘𝐵) ∈ (card‘𝐴) ↔ 𝐵𝐴))
87notbid 317 . . 3 ((𝐴 ∈ dom card ∧ 𝐵 ∈ dom card) → (¬ (card‘𝐵) ∈ (card‘𝐴) ↔ ¬ 𝐵𝐴))
95, 8syl5bb 282 . 2 ((𝐴 ∈ dom card ∧ 𝐵 ∈ dom card) → ((card‘𝐴) ⊆ (card‘𝐵) ↔ ¬ 𝐵𝐴))
101, 9bitr3d 280 1 ((𝐴 ∈ dom card ∧ 𝐵 ∈ dom card) → (𝐴𝐵 ↔ ¬ 𝐵𝐴))
Colors of variables: wff setvar class
Syntax hints:  ¬ wn 3  wi 4  wb 205  wa 395  wcel 2108  wss 3883   class class class wbr 5070  dom cdm 5580  Oncon0 6251  cfv 6418  cdom 8689  csdm 8690  cardccrd 9624
This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1799  ax-4 1813  ax-5 1914  ax-6 1972  ax-7 2012  ax-8 2110  ax-9 2118  ax-10 2139  ax-11 2156  ax-12 2173  ax-ext 2709  ax-sep 5218  ax-nul 5225  ax-pow 5283  ax-pr 5347  ax-un 7566
This theorem depends on definitions:  df-bi 206  df-an 396  df-or 844  df-3or 1086  df-3an 1087  df-tru 1542  df-fal 1552  df-ex 1784  df-nf 1788  df-sb 2069  df-mo 2540  df-eu 2569  df-clab 2716  df-cleq 2730  df-clel 2817  df-nfc 2888  df-ne 2943  df-ral 3068  df-rex 3069  df-rab 3072  df-v 3424  df-dif 3886  df-un 3888  df-in 3890  df-ss 3900  df-pss 3902  df-nul 4254  df-if 4457  df-pw 4532  df-sn 4559  df-pr 4561  df-tp 4563  df-op 4565  df-uni 4837  df-int 4877  df-br 5071  df-opab 5133  df-mpt 5154  df-tr 5188  df-id 5480  df-eprel 5486  df-po 5494  df-so 5495  df-fr 5535  df-we 5537  df-xp 5586  df-rel 5587  df-cnv 5588  df-co 5589  df-dm 5590  df-rn 5591  df-res 5592  df-ima 5593  df-ord 6254  df-on 6255  df-iota 6376  df-fun 6420  df-fn 6421  df-f 6422  df-f1 6423  df-fo 6424  df-f1o 6425  df-fv 6426  df-er 8456  df-en 8692  df-dom 8693  df-sdom 8694  df-card 9628
This theorem is referenced by:  fidomtri  9682  harsdom  9684  infdif  9896  infdif2  9897  infunsdom1  9900  infunsdom  9901  infxp  9902  domtri  10243  canthp1lem2  10340  pwfseqlem4a  10348  pwfseqlem4  10349  gchaleph  10358  numinfctb  40844
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