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| Mirrors > Home > MPE Home > Th. List > cardsdomelir | Structured version Visualization version GIF version | ||
| Description: A cardinal strictly dominates its members. Equivalent to Proposition 10.37 of [TakeutiZaring] p. 93. This is half of the assertion cardsdomel 10055 and can be proven without the AC. (Contributed by Mario Carneiro, 15-Jan-2013.) |
| Ref | Expression |
|---|---|
| cardsdomelir | ⊢ (𝐴 ∈ (card‘𝐵) → 𝐴 ≺ 𝐵) |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | cardon 10025 | . . . 4 ⊢ (card‘𝐵) ∈ On | |
| 2 | 1 | onelssi 6479 | . . . 4 ⊢ (𝐴 ∈ (card‘𝐵) → 𝐴 ⊆ (card‘𝐵)) |
| 3 | ssdomg 9027 | . . . 4 ⊢ ((card‘𝐵) ∈ On → (𝐴 ⊆ (card‘𝐵) → 𝐴 ≼ (card‘𝐵))) | |
| 4 | 1, 2, 3 | mpsyl 69 | . . 3 ⊢ (𝐴 ∈ (card‘𝐵) → 𝐴 ≼ (card‘𝐵)) |
| 5 | elfvdm 6919 | . . . 4 ⊢ (𝐴 ∈ (card‘𝐵) → 𝐵 ∈ dom card) | |
| 6 | cardid2 10034 | . . . 4 ⊢ (𝐵 ∈ dom card → (card‘𝐵) ≈ 𝐵) | |
| 7 | 5, 6 | syl 18 | . . 3 ⊢ (𝐴 ∈ (card‘𝐵) → (card‘𝐵) ≈ 𝐵) |
| 8 | domentr 9040 | . . 3 ⊢ ((𝐴 ≼ (card‘𝐵) ∧ (card‘𝐵) ≈ 𝐵) → 𝐴 ≼ 𝐵) | |
| 9 | 4, 7, 8 | syl2anc 596 | . 2 ⊢ (𝐴 ∈ (card‘𝐵) → 𝐴 ≼ 𝐵) |
| 10 | cardne 10046 | . 2 ⊢ (𝐴 ∈ (card‘𝐵) → ¬ 𝐴 ≈ 𝐵) | |
| 11 | brsdom 9001 | . 2 ⊢ (𝐴 ≺ 𝐵 ↔ (𝐴 ≼ 𝐵 ∧ ¬ 𝐴 ≈ 𝐵)) | |
| 12 | 9, 10, 11 | sylanbrc 595 | 1 ⊢ (𝐴 ∈ (card‘𝐵) → 𝐴 ≺ 𝐵) |
| Colors of variables: wff setvar class |
| This proof depends on syntax axioms: ¬ wn 3 → wi 4 ∈ wcel 2144 ⊆ wss 3895 class class class wbr 5102 dom cdm 5650 Oncon0 6362 ‘cfv 6538 ≈ cen 8970 ≼ cdom 8971 ≺ csdm 8972 cardccrd 10016 |
| This proof depends on axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1827 ax-4 1841 ax-5 1942 ax-6 1999 ax-7 2040 ax-8 2146 ax-9 2154 ax-10 2177 ax-11 2193 ax-12 2212 ax-ext 2732 ax-sep 5248 ax-nul 5259 ax-pow 5326 ax-pr 5390 ax-un 7751 |
| This proof depends on definitions: df-bi 210 df-an 402 df-or 862 df-3or 1104 df-3an 1105 df-tru 1572 df-fal 1582 df-ex 1812 df-nf 1816 df-sb 2099 df-mo 2564 df-eu 2594 df-clab 2739 df-cleq 2752 df-clel 2835 df-nfc 2909 df-ne 2956 df-ral 3077 df-rex 3087 df-rab 3413 df-v 3452 df-ss 3896 df-pss 4014 df-dif 4047 df-in 4091 df-un 4151 df-nul 4279 df-if 4482 df-pw 4558 df-sn 4584 df-pr 4586 df-op 4590 df-uni 4867 df-int 4907 df-br 5103 df-opab 5167 df-mpt 5186 df-tr 5212 df-id 5545 df-eprel 5550 df-po 5558 df-so 5559 df-fr 5603 df-we 5605 df-xp 5656 df-rel 5657 df-cnv 5658 df-co 5659 df-dm 5660 df-rn 5661 df-res 5662 df-ima 5663 df-ord 6365 df-on 6366 df-iota 6494 df-fun 6540 df-fn 6541 df-f 6542 df-f1 6543 df-fo 6544 df-f1o 6545 df-fv 6546 df-en 8974 df-dom 8975 df-sdom 8976 df-card 10020 |
| This theorem is used by: cardsdomel 10055 pwsdompw 10281 alephval2 10657 pwcfsdom 10668 tskcard 10866 |
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