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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 9640 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 8449 | . 2 ⊢ (𝐴 ∈ ω → ((rec(𝐺, ∅) ↾ ω)‘suc 𝐴) = (𝐺‘((rec(𝐺, ∅) ↾ ω)‘𝐴))) | |
| 2 | inf3lem.2 | . . 3 ⊢ 𝐹 = (rec(𝐺, ∅) ↾ ω) | |
| 3 | 2 | fveq1i 6887 | . 2 ⊢ (𝐹‘suc 𝐴) = ((rec(𝐺, ∅) ↾ ω)‘suc 𝐴) |
| 4 | 2 | fveq1i 6887 | . . 3 ⊢ (𝐹‘𝐴) = ((rec(𝐺, ∅) ↾ ω)‘𝐴) |
| 5 | 4 | fveq2i 6889 | . 2 ⊢ (𝐺‘(𝐹‘𝐴)) = (𝐺‘((rec(𝐺, ∅) ↾ ω)‘𝐴)) |
| 6 | 1, 3, 5 | 3eqtr4g 2820 | 1 ⊢ (𝐴 ∈ ω → (𝐹‘suc 𝐴) = (𝐺‘(𝐹‘𝐴))) |
| Colors of variables: wff setvar class |
| This proof depends on syntax axioms: → wi 4 = wceq 1569 ∈ wcel 2144 {crab 3412 Vcvv 3450 ⊆ wss 3895 ∩ cin 4089 ∅c0 4278 ↦ cmpt 5185 ↾ cres 5652 suc csuc 6364 ‘cfv 6539 ωcom 7878 reccrdg 8421 |
| This proof depends on axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1827 ax-4 1841 ax-5 1942 ax-6 1999 ax-7 2040 ax-8 2146 ax-9 2154 ax-10 2177 ax-11 2193 ax-12 2212 ax-ext 2732 ax-sep 5248 ax-nul 5259 ax-pr 5390 ax-un 7752 |
| This proof depends on definitions: df-bi 210 df-an 402 df-or 862 df-3or 1104 df-3an 1105 df-tru 1572 df-fal 1582 df-ex 1812 df-nf 1816 df-sb 2099 df-mo 2564 df-eu 2594 df-clab 2739 df-cleq 2752 df-clel 2835 df-nfc 2909 df-ne 2956 df-ral 3077 df-rex 3087 df-reu 3366 df-rab 3413 df-v 3452 df-sbc 3739 df-csb 3847 df-ss 3896 df-pss 4014 df-dif 4047 df-in 4091 df-un 4151 df-nul 4279 df-if 4482 df-pw 4558 df-sn 4585 df-pr 4587 df-op 4835 df-uni 4867 df-iun 4952 df-br 5103 df-opab 5167 df-mpt 5186 df-tr 5212 df-id 5545 df-eprel 5550 df-po 5558 df-so 5559 df-fr 5603 df-we 5605 df-xp 5656 df-rel 5657 df-cnv 5658 df-co 5659 df-dm 5660 df-rn 5661 df-res 5662 df-ima 5663 df-pred 6304 df-ord 6365 df-on 6366 df-lim 6367 df-suc 6368 df-iota 6494 df-fun 6541 df-fn 6542 df-f 6543 df-f1 6544 df-fo 6545 df-f1o 6546 df-fv 6547 df-ov 7424 df-om 7879 df-2nd 8003 df-frecs 8303 df-wrecs 8334 df-recs 8383 df-rdg 8422 |
| This theorem is used by: inf3lemd 9632 inf3lem1 9633 inf3lem2 9634 inf3lem3 9635 |
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