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| Description: The rank of a singleton. Theorem 15.17(v) of [Monk1] p. 112. (Contributed by NM, 28-Nov-2003.) (Revised by Mario Carneiro, 17-Nov-2014.) | 
| Ref | Expression | 
|---|---|
| ranksn.1 | ⊢ 𝐴 ∈ V | 
| Ref | Expression | 
|---|---|
| ranksn | ⊢ (rank‘{𝐴}) = suc (rank‘𝐴) | 
| Step | Hyp | Ref | Expression | 
|---|---|---|---|
| 1 | ranksn.1 | . . 3 ⊢ 𝐴 ∈ V | |
| 2 | unir1 9854 | . . 3 ⊢ ∪ (𝑅1 “ On) = V | |
| 3 | 1, 2 | eleqtrri 2839 | . 2 ⊢ 𝐴 ∈ ∪ (𝑅1 “ On) | 
| 4 | ranksnb 9868 | . 2 ⊢ (𝐴 ∈ ∪ (𝑅1 “ On) → (rank‘{𝐴}) = suc (rank‘𝐴)) | |
| 5 | 3, 4 | ax-mp 5 | 1 ⊢ (rank‘{𝐴}) = suc (rank‘𝐴) | 
| Colors of variables: wff setvar class | 
| Syntax hints: = wceq 1539 ∈ wcel 2107 Vcvv 3479 {csn 4625 ∪ cuni 4906 “ cima 5687 Oncon0 6383 suc csuc 6385 ‘cfv 6560 𝑅1cr1 9803 rankcrnk 9804 | 
| This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1794 ax-4 1808 ax-5 1909 ax-6 1966 ax-7 2006 ax-8 2109 ax-9 2117 ax-10 2140 ax-11 2156 ax-12 2176 ax-ext 2707 ax-rep 5278 ax-sep 5295 ax-nul 5305 ax-pow 5364 ax-pr 5431 ax-un 7756 ax-reg 9633 ax-inf2 9682 | 
| This theorem depends on definitions: df-bi 207 df-an 396 df-or 848 df-3or 1087 df-3an 1088 df-tru 1542 df-fal 1552 df-ex 1779 df-nf 1783 df-sb 2064 df-mo 2539 df-eu 2568 df-clab 2714 df-cleq 2728 df-clel 2815 df-nfc 2891 df-ne 2940 df-ral 3061 df-rex 3070 df-reu 3380 df-rab 3436 df-v 3481 df-sbc 3788 df-csb 3899 df-dif 3953 df-un 3955 df-in 3957 df-ss 3967 df-pss 3970 df-nul 4333 df-if 4525 df-pw 4601 df-sn 4626 df-pr 4628 df-op 4632 df-uni 4907 df-int 4946 df-iun 4992 df-br 5143 df-opab 5205 df-mpt 5225 df-tr 5259 df-id 5577 df-eprel 5583 df-po 5591 df-so 5592 df-fr 5636 df-we 5638 df-xp 5690 df-rel 5691 df-cnv 5692 df-co 5693 df-dm 5694 df-rn 5695 df-res 5696 df-ima 5697 df-pred 6320 df-ord 6386 df-on 6387 df-lim 6388 df-suc 6389 df-iota 6513 df-fun 6562 df-fn 6563 df-f 6564 df-f1 6565 df-fo 6566 df-f1o 6567 df-fv 6568 df-ov 7435 df-om 7889 df-2nd 8016 df-frecs 8307 df-wrecs 8338 df-recs 8412 df-rdg 8451 df-r1 9805 df-rank 9806 | 
| This theorem is referenced by: ranksuc 9906 ranksng 36169 | 
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