Theorem fin2solem 38257

Description: Lemma for fin2so 38258. (Contributed by Brendan Leahy, 29-Jun-2019.)

Assertion

Ref	Expression
fin2solem	⊢ ((𝑅 Or 𝑥 ∧ (𝑦 ∈ 𝑥 ∧ 𝑧 ∈ 𝑥)) → (𝑦𝑅𝑧 → {𝑤 ∈ 𝑥 ∣ 𝑤𝑅𝑦} [⊊] {𝑤 ∈ 𝑥 ∣ 𝑤𝑅𝑧}))

Distinct variable group:   𝑥,𝑤,𝑦,𝑧,𝑅

Proof of Theorem fin2solem

Step	Hyp	Ref	Expression
1		ancom 465	. . . . . . . . . 10 ⊢ (((𝑦 ∈ 𝑥 ∧ 𝑧 ∈ 𝑥) ∧ 𝑤 ∈ 𝑥) ↔ (𝑤 ∈ 𝑥 ∧ (𝑦 ∈ 𝑥 ∧ 𝑧 ∈ 𝑥)))
2		3anass 1111	. . . . . . . . . 10 ⊢ ((𝑤 ∈ 𝑥 ∧ 𝑦 ∈ 𝑥 ∧ 𝑧 ∈ 𝑥) ↔ (𝑤 ∈ 𝑥 ∧ (𝑦 ∈ 𝑥 ∧ 𝑧 ∈ 𝑥)))
3	1, 2	bitr4i 281	. . . . . . . . 9 ⊢ (((𝑦 ∈ 𝑥 ∧ 𝑧 ∈ 𝑥) ∧ 𝑤 ∈ 𝑥) ↔ (𝑤 ∈ 𝑥 ∧ 𝑦 ∈ 𝑥 ∧ 𝑧 ∈ 𝑥))
4		sotr 5594	. . . . . . . . 9 ⊢ ((𝑅 Or 𝑥 ∧ (𝑤 ∈ 𝑥 ∧ 𝑦 ∈ 𝑥 ∧ 𝑧 ∈ 𝑥)) → ((𝑤𝑅𝑦 ∧ 𝑦𝑅𝑧) → 𝑤𝑅𝑧))
5	3, 4	sylan2b 605	. . . . . . . 8 ⊢ ((𝑅 Or 𝑥 ∧ ((𝑦 ∈ 𝑥 ∧ 𝑧 ∈ 𝑥) ∧ 𝑤 ∈ 𝑥)) → ((𝑤𝑅𝑦 ∧ 𝑦𝑅𝑧) → 𝑤𝑅𝑧))
6	5	anassrs 472	. . . . . . 7 ⊢ (((𝑅 Or 𝑥 ∧ (𝑦 ∈ 𝑥 ∧ 𝑧 ∈ 𝑥)) ∧ 𝑤 ∈ 𝑥) → ((𝑤𝑅𝑦 ∧ 𝑦𝑅𝑧) → 𝑤𝑅𝑧))
7	6	ancomsd 470	. . . . . 6 ⊢ (((𝑅 Or 𝑥 ∧ (𝑦 ∈ 𝑥 ∧ 𝑧 ∈ 𝑥)) ∧ 𝑤 ∈ 𝑥) → ((𝑦𝑅𝑧 ∧ 𝑤𝑅𝑦) → 𝑤𝑅𝑧))
8	7	expdimp 457	. . . . 5 ⊢ ((((𝑅 Or 𝑥 ∧ (𝑦 ∈ 𝑥 ∧ 𝑧 ∈ 𝑥)) ∧ 𝑤 ∈ 𝑥) ∧ 𝑦𝑅𝑧) → (𝑤𝑅𝑦 → 𝑤𝑅𝑧))
9	8	an32s 664	. . . 4 ⊢ ((((𝑅 Or 𝑥 ∧ (𝑦 ∈ 𝑥 ∧ 𝑧 ∈ 𝑥)) ∧ 𝑦𝑅𝑧) ∧ 𝑤 ∈ 𝑥) → (𝑤𝑅𝑦 → 𝑤𝑅𝑧))
10	9	ss2rabdv 4029	. . 3 ⊢ (((𝑅 Or 𝑥 ∧ (𝑦 ∈ 𝑥 ∧ 𝑧 ∈ 𝑥)) ∧ 𝑦𝑅𝑧) → {𝑤 ∈ 𝑥 ∣ 𝑤𝑅𝑦} ⊆ {𝑤 ∈ 𝑥 ∣ 𝑤𝑅𝑧})
11		breq1 5112	. . . . . . . 8 ⊢ (𝑤 = 𝑦 → (𝑤𝑅𝑧 ↔ 𝑦𝑅𝑧))
12	11	elrab 3650	. . . . . . 7 ⊢ (𝑦 ∈ {𝑤 ∈ 𝑥 ∣ 𝑤𝑅𝑧} ↔ (𝑦 ∈ 𝑥 ∧ 𝑦𝑅𝑧))
13	12	biimpri 231	. . . . . 6 ⊢ ((𝑦 ∈ 𝑥 ∧ 𝑦𝑅𝑧) → 𝑦 ∈ {𝑤 ∈ 𝑥 ∣ 𝑤𝑅𝑧})
14	13	adantll 726	. . . . 5 ⊢ (((𝑅 Or 𝑥 ∧ 𝑦 ∈ 𝑥) ∧ 𝑦𝑅𝑧) → 𝑦 ∈ {𝑤 ∈ 𝑥 ∣ 𝑤𝑅𝑧})
15		sonr 5593	. . . . . . 7 ⊢ ((𝑅 Or 𝑥 ∧ 𝑦 ∈ 𝑥) → ¬ 𝑦𝑅𝑦)
16		breq1 5112	. . . . . . . . 9 ⊢ (𝑤 = 𝑦 → (𝑤𝑅𝑦 ↔ 𝑦𝑅𝑦))
17	16	elrab 3650	. . . . . . . 8 ⊢ (𝑦 ∈ {𝑤 ∈ 𝑥 ∣ 𝑤𝑅𝑦} ↔ (𝑦 ∈ 𝑥 ∧ 𝑦𝑅𝑦))
18	17	simprbi 502	. . . . . . 7 ⊢ (𝑦 ∈ {𝑤 ∈ 𝑥 ∣ 𝑤𝑅𝑦} → 𝑦𝑅𝑦)
19	15, 18	nsyl 141	. . . . . 6 ⊢ ((𝑅 Or 𝑥 ∧ 𝑦 ∈ 𝑥) → ¬ 𝑦 ∈ {𝑤 ∈ 𝑥 ∣ 𝑤𝑅𝑦})
20	19	adantr 485	. . . . 5 ⊢ (((𝑅 Or 𝑥 ∧ 𝑦 ∈ 𝑥) ∧ 𝑦𝑅𝑧) → ¬ 𝑦 ∈ {𝑤 ∈ 𝑥 ∣ 𝑤𝑅𝑦})
21		nelne1 3055	. . . . . 6 ⊢ ((𝑦 ∈ {𝑤 ∈ 𝑥 ∣ 𝑤𝑅𝑧} ∧ ¬ 𝑦 ∈ {𝑤 ∈ 𝑥 ∣ 𝑤𝑅𝑦}) → {𝑤 ∈ 𝑥 ∣ 𝑤𝑅𝑧} ≠ {𝑤 ∈ 𝑥 ∣ 𝑤𝑅𝑦})
22	21	necomd 3013	. . . . 5 ⊢ ((𝑦 ∈ {𝑤 ∈ 𝑥 ∣ 𝑤𝑅𝑧} ∧ ¬ 𝑦 ∈ {𝑤 ∈ 𝑥 ∣ 𝑤𝑅𝑦}) → {𝑤 ∈ 𝑥 ∣ 𝑤𝑅𝑦} ≠ {𝑤 ∈ 𝑥 ∣ 𝑤𝑅𝑧})
23	14, 20, 22	syl2anc 595	. . . 4 ⊢ (((𝑅 Or 𝑥 ∧ 𝑦 ∈ 𝑥) ∧ 𝑦𝑅𝑧) → {𝑤 ∈ 𝑥 ∣ 𝑤𝑅𝑦} ≠ {𝑤 ∈ 𝑥 ∣ 𝑤𝑅𝑧})
24	23	adantlrr 733	. . 3 ⊢ (((𝑅 Or 𝑥 ∧ (𝑦 ∈ 𝑥 ∧ 𝑧 ∈ 𝑥)) ∧ 𝑦𝑅𝑧) → {𝑤 ∈ 𝑥 ∣ 𝑤𝑅𝑦} ≠ {𝑤 ∈ 𝑥 ∣ 𝑤𝑅𝑧})
25		vex 3459	. . . . . 6 ⊢ 𝑥 ∈ V
26	25	rabex 5309	. . . . 5 ⊢ {𝑤 ∈ 𝑥 ∣ 𝑤𝑅𝑧} ∈ V
27	26	brrpss 7723	. . . 4 ⊢ ({𝑤 ∈ 𝑥 ∣ 𝑤𝑅𝑦} [⊊] {𝑤 ∈ 𝑥 ∣ 𝑤𝑅𝑧} ↔ {𝑤 ∈ 𝑥 ∣ 𝑤𝑅𝑦} ⊊ {𝑤 ∈ 𝑥 ∣ 𝑤𝑅𝑧})
28		df-pss 3925	. . . 4 ⊢ ({𝑤 ∈ 𝑥 ∣ 𝑤𝑅𝑦} ⊊ {𝑤 ∈ 𝑥 ∣ 𝑤𝑅𝑧} ↔ ({𝑤 ∈ 𝑥 ∣ 𝑤𝑅𝑦} ⊆ {𝑤 ∈ 𝑥 ∣ 𝑤𝑅𝑧} ∧ {𝑤 ∈ 𝑥 ∣ 𝑤𝑅𝑦} ≠ {𝑤 ∈ 𝑥 ∣ 𝑤𝑅𝑧}))
29	27, 28	bitri 278	. . 3 ⊢ ({𝑤 ∈ 𝑥 ∣ 𝑤𝑅𝑦} [⊊] {𝑤 ∈ 𝑥 ∣ 𝑤𝑅𝑧} ↔ ({𝑤 ∈ 𝑥 ∣ 𝑤𝑅𝑦} ⊆ {𝑤 ∈ 𝑥 ∣ 𝑤𝑅𝑧} ∧ {𝑤 ∈ 𝑥 ∣ 𝑤𝑅𝑦} ≠ {𝑤 ∈ 𝑥 ∣ 𝑤𝑅𝑧}))
30	10, 24, 29	sylanbrc 594	. 2 ⊢ (((𝑅 Or 𝑥 ∧ (𝑦 ∈ 𝑥 ∧ 𝑧 ∈ 𝑥)) ∧ 𝑦𝑅𝑧) → {𝑤 ∈ 𝑥 ∣ 𝑤𝑅𝑦} [⊊] {𝑤 ∈ 𝑥 ∣ 𝑤𝑅𝑧})
31	30	ex 417	1 ⊢ ((𝑅 Or 𝑥 ∧ (𝑦 ∈ 𝑥 ∧ 𝑧 ∈ 𝑥)) → (𝑦𝑅𝑧 → {𝑤 ∈ 𝑥 ∣ 𝑤𝑅𝑦} [⊊] {𝑤 ∈ 𝑥 ∣ 𝑤𝑅𝑧}))

Syntax hints:  ¬ wn 3   → wi 4   ∧ wa 400   ∧ w3a 1103   ∈ wcel 2143   ≠ wne 2958  {crab 3416   ⊆ wss 3905   ⊊ wpss 3906   class class class wbr 5109   Or wor 5568   [⊊] crpss 7719

This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1825  ax-4 1839  ax-5 1940  ax-6 1997  ax-7 2038  ax-8 2145  ax-9 2153  ax-ext 2735  ax-sep 5257  ax-pr 5404

This theorem depends on definitions:  df-bi 210  df-an 401  df-or 861  df-3an 1105  df-tru 1573  df-fal 1583  df-ex 1810  df-sb 2097  df-clab 2742  df-cleq 2755  df-clel 2838  df-ne 2959  df-ral 3080  df-rex 3090  df-rab 3417  df-v 3457  df-dif 3908  df-un 3910  df-in 3912  df-ss 3922  df-pss 3925  df-nul 4287  df-if 4488  df-pw 4564  df-sn 4590  df-pr 4592  df-op 4596  df-br 5110  df-opab 5174  df-po 5569  df-so 5570  df-xp 5667  df-rel 5668  df-rpss 7720

This theorem is referenced by:  fin2so  38258