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| Mirrors > Home > MPE Home > Th. List > inf3lemc | Structured version Visualization version GIF version | ||
| Description: Lemma for our Axiom of Infinity => standard Axiom of Infinity. See inf3 9620 for detailed description. (Contributed by NM, 28-Oct-1996.) |
| Ref | Expression |
|---|---|
| inf3lem.1 | ⊢ 𝐺 = (𝑦 ∈ V ↦ {𝑤 ∈ 𝑥 ∣ (𝑤 ∩ 𝑥) ⊆ 𝑦}) |
| inf3lem.2 | ⊢ 𝐹 = (rec(𝐺, ∅) ↾ ω) |
| inf3lem.3 | ⊢ 𝐴 ∈ V |
| inf3lem.4 | ⊢ 𝐵 ∈ V |
| Ref | Expression |
|---|---|
| inf3lemc | ⊢ (𝐴 ∈ ω → (𝐹‘suc 𝐴) = (𝐺‘(𝐹‘𝐴))) |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | frsuc 8429 | . 2 ⊢ (𝐴 ∈ ω → ((rec(𝐺, ∅) ↾ ω)‘suc 𝐴) = (𝐺‘((rec(𝐺, ∅) ↾ ω)‘𝐴))) | |
| 2 | inf3lem.2 | . . 3 ⊢ 𝐹 = (rec(𝐺, ∅) ↾ ω) | |
| 3 | 2 | fveq1i 6878 | . 2 ⊢ (𝐹‘suc 𝐴) = ((rec(𝐺, ∅) ↾ ω)‘suc 𝐴) |
| 4 | 2 | fveq1i 6878 | . . 3 ⊢ (𝐹‘𝐴) = ((rec(𝐺, ∅) ↾ ω)‘𝐴) |
| 5 | 4 | fveq2i 6880 | . 2 ⊢ (𝐺‘(𝐹‘𝐴)) = (𝐺‘((rec(𝐺, ∅) ↾ ω)‘𝐴)) |
| 6 | 1, 3, 5 | 3eqtr4g 2821 | 1 ⊢ (𝐴 ∈ ω → (𝐹‘suc 𝐴) = (𝐺‘(𝐹‘𝐴))) |
| Colors of variables: wff setvar class |
| This proof depends on syntax axioms: → wi 4 = wceq 1570 ∈ wcel 2145 {crab 3413 Vcvv 3451 ∩ cin 3898 ⊆ wss 3899 ∅c0 4279 ↦ cmpt 5186 ↾ cres 5653 suc csuc 6357 ‘cfv 6531 ωcom 7866 reccrdg 8401 |
| 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 2213 ax-ext 2733 ax-sep 5249 ax-nul 5260 ax-pr 5391 ax-un 7740 |
| 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 2565 df-eu 2595 df-clab 2740 df-cleq 2753 df-clel 2836 df-nfc 2910 df-ne 2957 df-ral 3078 df-rex 3088 df-reu 3367 df-rab 3414 df-v 3453 df-sbc 3740 df-csb 3848 df-dif 3902 df-un 3904 df-in 3906 df-ss 3916 df-pss 3919 df-nul 4280 df-if 4483 df-pw 4559 df-sn 4585 df-pr 4587 df-op 4591 df-uni 4868 df-iun 4953 df-br 5104 df-opab 5168 df-mpt 5187 df-tr 5213 df-id 5546 df-eprel 5551 df-po 5559 df-so 5560 df-fr 5604 df-we 5606 df-xp 5657 df-rel 5658 df-cnv 5659 df-co 5660 df-dm 5661 df-rn 5662 df-res 5663 df-ima 5664 df-pred 6297 df-ord 6358 df-on 6359 df-lim 6360 df-suc 6361 df-iota 6487 df-fun 6533 df-fn 6534 df-f 6535 df-f1 6536 df-fo 6537 df-f1o 6538 df-fv 6539 df-ov 7415 df-om 7867 df-2nd 7991 df-frecs 8283 df-wrecs 8314 df-recs 8363 df-rdg 8402 |
| This theorem is used by: inf3lemd 9612 inf3lem1 9613 inf3lem2 9614 inf3lem3 9615 |
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