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| Mirrors > Home > MPE Home > Th. List > rankvaln | Structured version Visualization version GIF version | ||
| Description: Value of the rank function at a non-well-founded set. (The antecedent is always false under Foundation, by unir1 9798, unless 𝐴 is a proper class.) (Contributed by Mario Carneiro, 22-Mar-2013.) (Revised by Mario Carneiro, 10-Sep-2013.) |
| Ref | Expression |
|---|---|
| rankvaln | ⊢ (¬ 𝐴 ∈ ∪ (𝑅1 “ On) → (rank‘𝐴) = ∅) |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | rankf 9779 | . . . 4 ⊢ rank:∪ (𝑅1 “ On)⟶On | |
| 2 | 1 | fdmi 6718 | . . 3 ⊢ dom rank = ∪ (𝑅1 “ On) |
| 3 | 2 | eleq2i 2854 | . 2 ⊢ (𝐴 ∈ dom rank ↔ 𝐴 ∈ ∪ (𝑅1 “ On)) |
| 4 | ndmfv 6914 | . 2 ⊢ (¬ 𝐴 ∈ dom rank → (rank‘𝐴) = ∅) | |
| 5 | 3, 4 | sylnbir 334 | 1 ⊢ (¬ 𝐴 ∈ ∪ (𝑅1 “ On) → (rank‘𝐴) = ∅) |
| Colors of variables: wff setvar class |
| This proof depends on syntax axioms: ¬ wn 3 → wi 4 = wceq 1570 ∈ wcel 2145 ∅c0 4282 ∪ cuni 4870 dom cdm 5659 “ cima 5662 Oncon0 6361 ‘cfv 6537 𝑅1cr1 9747 rankcrnk 9748 |
| This proof depends on axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1828 ax-4 1842 ax-5 1943 ax-6 2000 ax-7 2041 ax-8 2147 ax-9 2155 ax-10 2178 ax-11 2194 ax-12 2215 ax-ext 2734 ax-sep 5255 ax-nul 5267 ax-pow 5334 ax-pr 5402 ax-un 7739 |
| This proof depends on definitions: df-bi 210 df-an 402 df-or 862 df-3or 1104 df-3an 1105 df-tru 1573 df-fal 1583 df-ex 1813 df-nf 1817 df-sb 2100 df-mo 2566 df-eu 2596 df-clab 2741 df-cleq 2754 df-clel 2837 df-nfc 2911 df-ne 2958 df-ral 3079 df-rex 3089 df-reu 3368 df-rab 3415 df-v 3455 df-sbc 3743 df-csb 3851 df-dif 3905 df-un 3907 df-in 3909 df-ss 3919 df-pss 3922 df-nul 4283 df-if 4486 df-pw 4562 df-sn 4588 df-pr 4590 df-op 4594 df-uni 4871 df-int 4911 df-iun 4956 df-br 5108 df-opab 5172 df-mpt 5191 df-tr 5217 df-id 5554 df-eprel 5559 df-po 5567 df-so 5568 df-fr 5612 df-we 5614 df-xp 5665 df-rel 5666 df-cnv 5667 df-co 5668 df-dm 5669 df-rn 5670 df-res 5671 df-ima 5672 df-pred 6303 df-ord 6364 df-on 6365 df-lim 6366 df-suc 6367 df-iota 6493 df-fun 6539 df-fn 6540 df-f 6541 df-f1 6542 df-fo 6543 df-f1o 6544 df-fv 6545 df-ov 7419 df-om 7866 df-2nd 7990 df-frecs 8283 df-wrecs 8314 df-recs 8363 df-rdg 8402 df-r1 9749 df-rank 9750 |
| This theorem is used by: rankdmr1 9786 rankcf 10789 |
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