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Related theorems GIF version |
| Description: Value of an alternate definition of the rank function. Definition of [BellMachover] p. 478. |
| Ref | Expression |
|---|---|
| rankval2 | ⊢ (A ∈ B → (rank ‘A) = ∩{x ∈ On∣A ⊆ (R1 ‘x)}) |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | rankvalg 3513 | . 2 ⊢ (A ∈ B → (rank ‘A) = ∩{x ∈ On∣A ∈ (R1 ‘suc x)}) | |
| 2 | r1suc 3496 | . . . . . 6 ⊢ (x ∈ On → (R1 ‘suc x) = ℘(R1 ‘x)) | |
| 3 | 2 | eleq2d 1156 | . . . . 5 ⊢ (x ∈ On → (A ∈ (R1 ‘suc x) ↔ A ∈ ℘(R1 ‘x))) |
| 4 | fvex 2838 | . . . . . 6 ⊢ (R1 ‘x) ∈ V | |
| 5 | elpw2g 1803 | . . . . . 6 ⊢ ((R1 ‘x) ∈ V → (A ∈ ℘(R1 ‘x) ↔ A ⊆ (R1 ‘x))) | |
| 6 | 4, 5 | ax-mp 6 | . . . . 5 ⊢ (A ∈ ℘(R1 ‘x) ↔ A ⊆ (R1 ‘x)) |
| 7 | 3, 6 | syl6bb 414 | . . . 4 ⊢ (x ∈ On → (A ∈ (R1 ‘suc x) ↔ A ⊆ (R1 ‘x))) |
| 8 | 7 | birabi 1342 | . . 3 ⊢ {x ∈ On∣A ∈ (R1 ‘suc x)} = {x ∈ On∣A ⊆ (R1 ‘x)} |
| 9 | 8 | inteqi 1969 | . 2 ⊢ ∩{x ∈ On∣A ∈ (R1 ‘suc x)} = ∩{x ∈ On∣A ⊆ (R1 ‘x)} |
| 10 | 1, 9 | syl6eq 1140 | 1 ⊢ (A ∈ B → (rank ‘A) = ∩{x ∈ On∣A ⊆ (R1 ‘x)}) |
| Colors of variables: wff set class |
| Syntax hints: → wi 2 ↔ wb 127 = wceq 1091 ∈ wcel 1092 {crab 1204 Vcvv 1348 ⊆ wss 1487 ℘cpw 1798 ∩cint 1965 Oncon0 2199 suc csuc 2201 ‘cfv 2422 R1cr1 3485 rankcrnk 3486 |
| This theorem is referenced by: rankr1id 3539 ranklon 3540 |
| This theorem was proved from axioms: ax-1 3 ax-2 4 ax-3 5 ax-mp 6 ax-4 673 ax-5 674 ax-6 675 ax-7 676 ax-gen 677 ax-8 798 ax-9 799 ax-10 800 ax-11 801 ax-12 802 ax-13 804 ax-14 805 ax-16 922 ax-17 925 ax-ext 1074 ax-rep 1075 ax-un 1076 ax-pow 1077 ax-reg 1078 ax-inf 1079 |
| This theorem depends on definitions: df-bi 128 df-or 197 df-an 198 df-3or 582 df-3an 583 df-ex 679 df-sb 853 df-eu 1009 df-mo 1010 df-clab 1093 df-cleq 1097 df-clel 1099 df-ne 1192 df-ral 1205 df-rex 1206 df-rab 1208 df-v 1349 df-sbc 1441 df-dif 1489 df-un 1490 df-in 1491 df-ss 1492 df-pss 1494 df-nul 1708 df-if 1777 df-pw 1799 df-sn 1811 df-pr 1812 df-tp 1814 df-op 1815 df-uni 1920 df-int 1966 df-iun 1996 df-tr 2042 df-br 2063 df-opab 2098 df-eprel 2122 df-id 2125 df-po 2128 df-so 2138 df-fr 2169 df-we 2186 df-ord 2202 df-on 2203 df-lim 2204 df-suc 2205 df-om 2373 df-xp 2424 df-rel 2425 df-cnv 2426 df-co 2427 df-dm 2428 df-rn 2429 df-res 2430 df-ima 2431 df-fun 2432 df-fn 2433 df-f 2434 df-f1 2435 df-fv 2438 df-rdg 2970 df-r1 3487 df-rank 3488 |