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| Mirrors > Home > MPE Home > Th. List > wdomnumr | Structured version Visualization version GIF version | ||
| Description: Weak dominance agrees with normal for numerable right sets. (Contributed by Stefan O'Rear, 28-Feb-2015.) (Revised by Mario Carneiro, 5-May-2015.) |
| Ref | Expression |
|---|---|
| wdomnumr | ⊢ (𝐵 ∈ dom card → (𝐴 ≼* 𝐵 ↔ 𝐴 ≼ 𝐵)) |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | brwdom 9565 | . . 3 ⊢ (𝐵 ∈ dom card → (𝐴 ≼* 𝐵 ↔ (𝐴 = ∅ ∨ ∃𝑥 𝑥:𝐵–onto→𝐴))) | |
| 2 | 0domg 9127 | . . . . 5 ⊢ (𝐵 ∈ dom card → ∅ ≼ 𝐵) | |
| 3 | breq1 5105 | . . . . 5 ⊢ (𝐴 = ∅ → (𝐴 ≼ 𝐵 ↔ ∅ ≼ 𝐵)) | |
| 4 | 2, 3 | syl5ibrcom 250 | . . . 4 ⊢ (𝐵 ∈ dom card → (𝐴 = ∅ → 𝐴 ≼ 𝐵)) |
| 5 | fodomnum 10140 | . . . . 5 ⊢ (𝐵 ∈ dom card → (𝑥:𝐵–onto→𝐴 → 𝐴 ≼ 𝐵)) | |
| 6 | 5 | exlimdv 1965 | . . . 4 ⊢ (𝐵 ∈ dom card → (∃𝑥 𝑥:𝐵–onto→𝐴 → 𝐴 ≼ 𝐵)) |
| 7 | 4, 6 | jaod 873 | . . 3 ⊢ (𝐵 ∈ dom card → ((𝐴 = ∅ ∨ ∃𝑥 𝑥:𝐵–onto→𝐴) → 𝐴 ≼ 𝐵)) |
| 8 | 1, 7 | sylbid 243 | . 2 ⊢ (𝐵 ∈ dom card → (𝐴 ≼* 𝐵 → 𝐴 ≼ 𝐵)) |
| 9 | domwdom 9572 | . 2 ⊢ (𝐴 ≼ 𝐵 → 𝐴 ≼* 𝐵) | |
| 10 | 8, 9 | impbid1 228 | 1 ⊢ (𝐵 ∈ dom card → (𝐴 ≼* 𝐵 ↔ 𝐴 ≼ 𝐵)) |
| Colors of variables: wff setvar class |
| This proof depends on syntax axioms: → wi 4 ↔ wb 209 ∨ wo 861 = wceq 1569 ∃wex 1811 ∈ wcel 2144 ∅c0 4278 class class class wbr 5102 dom cdm 5650 –onto→wfo 6537 ≼ cdom 8975 ≼* cwdom 9562 cardccrd 10020 |
| 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-rep 5231 ax-sep 5248 ax-nul 5259 ax-pow 5326 ax-pr 5390 ax-un 7752 |
| 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-rmo 3365 df-reu 3366 df-rab 3413 df-v 3452 df-sbc 3739 df-csb 3847 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 4585 df-pr 4587 df-op 4835 df-uni 4867 df-int 4907 df-iun 4952 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-se 5604 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-pred 6304 df-ord 6365 df-on 6366 df-suc 6368 df-iota 6494 df-fun 6541 df-fn 6542 df-f 6543 df-f1 6544 df-fo 6545 df-f1o 6546 df-fv 6547 df-isom 6548 df-riota 7378 df-ov 7424 df-oprab 7425 df-mpo 7426 df-1st 8002 df-2nd 8003 df-frecs 8303 df-wrecs 8334 df-recs 8383 df-er 8721 df-map 8853 df-en 8978 df-dom 8979 df-sdom 8980 df-wdom 9563 df-card 10024 df-acn 10027 |
| This theorem is used by: wdomac 10610 ttac 44137 isnumbasgrplem2 44200 |
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