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Related theorems GIF version |
| Description: Lemma for our Axiom of Infinity => standard Axiom of Infinity. See inf3 3471 for detailed description. |
| Ref | Expression |
|---|---|
| inf3lem.1 | ⊢ G = {〈y, z〉∣z = {w ∈ x∣(w ∩ x) ⊆ y}} |
| inf3lem.2 | ⊢ F = (rec(G, ∅) ↾ ω) |
| inf3lem.3 | ⊢ A ∈ V |
| inf3lem.4 | ⊢ B ∈ V |
| Ref | Expression |
|---|---|
| inf3lemb | ⊢ (F ‘∅) = ∅ |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | inf3lem.2 | . . 3 ⊢ F = (rec(G, ∅) ↾ ω) | |
| 2 | 1 | fveq1i 2833 | . 2 ⊢ (F ‘∅) = ((rec(G, ∅) ↾ ω) ‘∅) |
| 3 | 0ex 1745 | . . 3 ⊢ ∅ ∈ V | |
| 4 | frzer 2990 | . . 3 ⊢ (∅ ∈ V → ((rec(G, ∅) ↾ ω) ‘∅) = ∅) | |
| 5 | 3, 4 | ax-mp 6 | . 2 ⊢ ((rec(G, ∅) ↾ ω) ‘∅) = ∅ |
| 6 | 2, 5 | eqtr 1119 | 1 ⊢ (F ‘∅) = ∅ |
| Colors of variables: wff set class |
| Syntax hints: = wceq 1091 ∈ wcel 1092 {crab 1204 Vcvv 1348 ∩ cin 1486 ⊆ wss 1487 ∅c0 1707 {copab 2055 ωcom 2372 ↾ cres 2412 ‘cfv 2422 reccrdg 2969 |
| This theorem is referenced by: inf3lemd 3463 inf3lem1 3464 inf3lem2 3465 |
| 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 |
| 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-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-nul 1708 df-pw 1799 df-sn 1811 df-pr 1812 df-tp 1814 df-op 1815 df-uni 1920 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-fv 2438 df-rdg 2970 |