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| Mirrors > Home > MPE Home > Th. List > inf3lem4 | Structured version Visualization version GIF version | ||
| Description: Lemma for our Axiom of Infinity => standard Axiom of Infinity. See inf3 9614 for detailed description. (Contributed by NM, 29-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 |
|---|---|
| inf3lem4 | ⊢ ((𝑥 ≠ ∅ ∧ 𝑥 ⊆ ∪ 𝑥) → (𝐴 ∈ ω → (𝐹‘𝐴) ⊊ (𝐹‘suc 𝐴))) |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | inf3lem.1 | . . . . 5 ⊢ 𝐺 = (𝑦 ∈ V ↦ {𝑤 ∈ 𝑥 ∣ (𝑤 ∩ 𝑥) ⊆ 𝑦}) | |
| 2 | inf3lem.2 | . . . . 5 ⊢ 𝐹 = (rec(𝐺, ∅) ↾ ω) | |
| 3 | inf3lem.3 | . . . . 5 ⊢ 𝐴 ∈ V | |
| 4 | inf3lem.4 | . . . . 5 ⊢ 𝐵 ∈ V | |
| 5 | 1, 2, 3, 4 | inf3lem1 9607 | . . . 4 ⊢ (𝐴 ∈ ω → (𝐹‘𝐴) ⊆ (𝐹‘suc 𝐴)) |
| 6 | 5 | a1i 11 | . . 3 ⊢ ((𝑥 ≠ ∅ ∧ 𝑥 ⊆ ∪ 𝑥) → (𝐴 ∈ ω → (𝐹‘𝐴) ⊆ (𝐹‘suc 𝐴))) |
| 7 | 1, 2, 3, 4 | inf3lem3 9609 | . . 3 ⊢ ((𝑥 ≠ ∅ ∧ 𝑥 ⊆ ∪ 𝑥) → (𝐴 ∈ ω → (𝐹‘𝐴) ≠ (𝐹‘suc 𝐴))) |
| 8 | 6, 7 | jcad 522 | . 2 ⊢ ((𝑥 ≠ ∅ ∧ 𝑥 ⊆ ∪ 𝑥) → (𝐴 ∈ ω → ((𝐹‘𝐴) ⊆ (𝐹‘suc 𝐴) ∧ (𝐹‘𝐴) ≠ (𝐹‘suc 𝐴)))) |
| 9 | df-pss 3918 | . 2 ⊢ ((𝐹‘𝐴) ⊊ (𝐹‘suc 𝐴) ↔ ((𝐹‘𝐴) ⊆ (𝐹‘suc 𝐴) ∧ (𝐹‘𝐴) ≠ (𝐹‘suc 𝐴))) | |
| 10 | 8, 9 | imbitrrdi 255 | 1 ⊢ ((𝑥 ≠ ∅ ∧ 𝑥 ⊆ ∪ 𝑥) → (𝐴 ∈ ω → (𝐹‘𝐴) ⊊ (𝐹‘suc 𝐴))) |
| Colors of variables: wff setvar class |
| This proof depends on syntax axioms: → wi 4 ∧ wa 401 = wceq 1570 ∈ wcel 2145 ≠ wne 2955 {crab 3412 Vcvv 3450 ∩ cin 3897 ⊆ wss 3898 ⊊ wpss 3899 ∅c0 4278 ∪ cuni 4866 ↦ cmpt 5185 ↾ cres 5649 suc csuc 6353 ‘cfv 6527 ωcom 7860 reccrdg 8395 |
| 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 2732 ax-sep 5248 ax-nul 5259 ax-pr 5390 ax-un 7734 ax-reg 9564 |
| 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 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-dif 3901 df-un 3903 df-in 3905 df-ss 3915 df-pss 3918 df-nul 4279 df-if 4482 df-pw 4558 df-sn 4584 df-pr 4586 df-op 4590 df-uni 4867 df-iun 4952 df-br 5103 df-opab 5167 df-mpt 5186 df-tr 5212 df-id 5542 df-eprel 5547 df-po 5555 df-so 5556 df-fr 5600 df-we 5602 df-xp 5653 df-rel 5654 df-cnv 5655 df-co 5656 df-dm 5657 df-rn 5658 df-res 5659 df-ima 5660 df-pred 6293 df-ord 6354 df-on 6355 df-lim 6356 df-suc 6357 df-iota 6483 df-fun 6529 df-fn 6530 df-f 6531 df-f1 6532 df-fo 6533 df-f1o 6534 df-fv 6535 df-ov 7411 df-om 7861 df-2nd 7985 df-frecs 8277 df-wrecs 8308 df-recs 8357 df-rdg 8396 |
| This theorem is used by: inf3lem5 9611 |
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