Theorem fin2solem 32565

Description: Lemma for fin2so 32566. (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 1035	. . . . . . . . . 10 ⊢ ((𝑤 ∈ 𝑥 ∧ 𝑦 ∈ 𝑥 ∧ 𝑧 ∈ 𝑥) ↔ (𝑤 ∈ 𝑥 ∧ (𝑦 ∈ 𝑥 ∧ 𝑧 ∈ 𝑥)))
3	1, 2	bitr4i 266	. . . . . . . . 9 ⊢ (((𝑦 ∈ 𝑥 ∧ 𝑧 ∈ 𝑥) ∧ 𝑤 ∈ 𝑥) ↔ (𝑤 ∈ 𝑥 ∧ 𝑦 ∈ 𝑥 ∧ 𝑧 ∈ 𝑥))
4		sotr 4981	. . . . . . . . 9 ⊢ ((𝑅 Or 𝑥 ∧ (𝑤 ∈ 𝑥 ∧ 𝑦 ∈ 𝑥 ∧ 𝑧 ∈ 𝑥)) → ((𝑤𝑅𝑦 ∧ 𝑦𝑅𝑧) → 𝑤𝑅𝑧))
5	3, 4	sylan2b 491	. . . . . . . 8 ⊢ ((𝑅 Or 𝑥 ∧ ((𝑦 ∈ 𝑥 ∧ 𝑧 ∈ 𝑥) ∧ 𝑤 ∈ 𝑥)) → ((𝑤𝑅𝑦 ∧ 𝑦𝑅𝑧) → 𝑤𝑅𝑧))
6	5	anassrs 678	. . . . . . 7 ⊢ (((𝑅 Or 𝑥 ∧ (𝑦 ∈ 𝑥 ∧ 𝑧 ∈ 𝑥)) ∧ 𝑤 ∈ 𝑥) → ((𝑤𝑅𝑦 ∧ 𝑦𝑅𝑧) → 𝑤𝑅𝑧))
7	6	ancomsd 469	. . . . . 6 ⊢ (((𝑅 Or 𝑥 ∧ (𝑦 ∈ 𝑥 ∧ 𝑧 ∈ 𝑥)) ∧ 𝑤 ∈ 𝑥) → ((𝑦𝑅𝑧 ∧ 𝑤𝑅𝑦) → 𝑤𝑅𝑧))
8	7	expdimp 452	. . . . 5 ⊢ ((((𝑅 Or 𝑥 ∧ (𝑦 ∈ 𝑥 ∧ 𝑧 ∈ 𝑥)) ∧ 𝑤 ∈ 𝑥) ∧ 𝑦𝑅𝑧) → (𝑤𝑅𝑦 → 𝑤𝑅𝑧))
9	8	an32s 842	. . . 4 ⊢ ((((𝑅 Or 𝑥 ∧ (𝑦 ∈ 𝑥 ∧ 𝑧 ∈ 𝑥)) ∧ 𝑦𝑅𝑧) ∧ 𝑤 ∈ 𝑥) → (𝑤𝑅𝑦 → 𝑤𝑅𝑧))
10	9	ss2rabdv 3646	. . 3 ⊢ (((𝑅 Or 𝑥 ∧ (𝑦 ∈ 𝑥 ∧ 𝑧 ∈ 𝑥)) ∧ 𝑦𝑅𝑧) → {𝑤 ∈ 𝑥 ∣ 𝑤𝑅𝑦} ⊆ {𝑤 ∈ 𝑥 ∣ 𝑤𝑅𝑧})
11		breq1 4586	. . . . . . . 8 ⊢ (𝑤 = 𝑦 → (𝑤𝑅𝑧 ↔ 𝑦𝑅𝑧))
12	11	elrab 3331	. . . . . . 7 ⊢ (𝑦 ∈ {𝑤 ∈ 𝑥 ∣ 𝑤𝑅𝑧} ↔ (𝑦 ∈ 𝑥 ∧ 𝑦𝑅𝑧))
13	12	biimpri 217	. . . . . 6 ⊢ ((𝑦 ∈ 𝑥 ∧ 𝑦𝑅𝑧) → 𝑦 ∈ {𝑤 ∈ 𝑥 ∣ 𝑤𝑅𝑧})
14	13	adantll 746	. . . . 5 ⊢ (((𝑅 Or 𝑥 ∧ 𝑦 ∈ 𝑥) ∧ 𝑦𝑅𝑧) → 𝑦 ∈ {𝑤 ∈ 𝑥 ∣ 𝑤𝑅𝑧})
15		sonr 4980	. . . . . . 7 ⊢ ((𝑅 Or 𝑥 ∧ 𝑦 ∈ 𝑥) → ¬ 𝑦𝑅𝑦)
16		breq1 4586	. . . . . . . . 9 ⊢ (𝑤 = 𝑦 → (𝑤𝑅𝑦 ↔ 𝑦𝑅𝑦))
17	16	elrab 3331	. . . . . . . 8 ⊢ (𝑦 ∈ {𝑤 ∈ 𝑥 ∣ 𝑤𝑅𝑦} ↔ (𝑦 ∈ 𝑥 ∧ 𝑦𝑅𝑦))
18	17	simprbi 479	. . . . . . 7 ⊢ (𝑦 ∈ {𝑤 ∈ 𝑥 ∣ 𝑤𝑅𝑦} → 𝑦𝑅𝑦)
19	15, 18	nsyl 134	. . . . . 6 ⊢ ((𝑅 Or 𝑥 ∧ 𝑦 ∈ 𝑥) → ¬ 𝑦 ∈ {𝑤 ∈ 𝑥 ∣ 𝑤𝑅𝑦})
20	19	adantr 480	. . . . 5 ⊢ (((𝑅 Or 𝑥 ∧ 𝑦 ∈ 𝑥) ∧ 𝑦𝑅𝑧) → ¬ 𝑦 ∈ {𝑤 ∈ 𝑥 ∣ 𝑤𝑅𝑦})
21		nelne1 2878	. . . . . 6 ⊢ ((𝑦 ∈ {𝑤 ∈ 𝑥 ∣ 𝑤𝑅𝑧} ∧ ¬ 𝑦 ∈ {𝑤 ∈ 𝑥 ∣ 𝑤𝑅𝑦}) → {𝑤 ∈ 𝑥 ∣ 𝑤𝑅𝑧} ≠ {𝑤 ∈ 𝑥 ∣ 𝑤𝑅𝑦})
22	21	necomd 2837	. . . . 5 ⊢ ((𝑦 ∈ {𝑤 ∈ 𝑥 ∣ 𝑤𝑅𝑧} ∧ ¬ 𝑦 ∈ {𝑤 ∈ 𝑥 ∣ 𝑤𝑅𝑦}) → {𝑤 ∈ 𝑥 ∣ 𝑤𝑅𝑦} ≠ {𝑤 ∈ 𝑥 ∣ 𝑤𝑅𝑧})
23	14, 20, 22	syl2anc 691	. . . 4 ⊢ (((𝑅 Or 𝑥 ∧ 𝑦 ∈ 𝑥) ∧ 𝑦𝑅𝑧) → {𝑤 ∈ 𝑥 ∣ 𝑤𝑅𝑦} ≠ {𝑤 ∈ 𝑥 ∣ 𝑤𝑅𝑧})
24	23	adantlrr 753	. . 3 ⊢ (((𝑅 Or 𝑥 ∧ (𝑦 ∈ 𝑥 ∧ 𝑧 ∈ 𝑥)) ∧ 𝑦𝑅𝑧) → {𝑤 ∈ 𝑥 ∣ 𝑤𝑅𝑦} ≠ {𝑤 ∈ 𝑥 ∣ 𝑤𝑅𝑧})
25		vex 3176	. . . . . 6 ⊢ 𝑥 ∈ V
26	25	rabex 4740	. . . . 5 ⊢ {𝑤 ∈ 𝑥 ∣ 𝑤𝑅𝑧} ∈ V
27	26	brrpss 6838	. . . 4 ⊢ ({𝑤 ∈ 𝑥 ∣ 𝑤𝑅𝑦} [⊊] {𝑤 ∈ 𝑥 ∣ 𝑤𝑅𝑧} ↔ {𝑤 ∈ 𝑥 ∣ 𝑤𝑅𝑦} ⊊ {𝑤 ∈ 𝑥 ∣ 𝑤𝑅𝑧})
28		df-pss 3556	. . . 4 ⊢ ({𝑤 ∈ 𝑥 ∣ 𝑤𝑅𝑦} ⊊ {𝑤 ∈ 𝑥 ∣ 𝑤𝑅𝑧} ↔ ({𝑤 ∈ 𝑥 ∣ 𝑤𝑅𝑦} ⊆ {𝑤 ∈ 𝑥 ∣ 𝑤𝑅𝑧} ∧ {𝑤 ∈ 𝑥 ∣ 𝑤𝑅𝑦} ≠ {𝑤 ∈ 𝑥 ∣ 𝑤𝑅𝑧}))
29	27, 28	bitri 263	. . 3 ⊢ ({𝑤 ∈ 𝑥 ∣ 𝑤𝑅𝑦} [⊊] {𝑤 ∈ 𝑥 ∣ 𝑤𝑅𝑧} ↔ ({𝑤 ∈ 𝑥 ∣ 𝑤𝑅𝑦} ⊆ {𝑤 ∈ 𝑥 ∣ 𝑤𝑅𝑧} ∧ {𝑤 ∈ 𝑥 ∣ 𝑤𝑅𝑦} ≠ {𝑤 ∈ 𝑥 ∣ 𝑤𝑅𝑧}))
30	10, 24, 29	sylanbrc 695	. 2 ⊢ (((𝑅 Or 𝑥 ∧ (𝑦 ∈ 𝑥 ∧ 𝑧 ∈ 𝑥)) ∧ 𝑦𝑅𝑧) → {𝑤 ∈ 𝑥 ∣ 𝑤𝑅𝑦} [⊊] {𝑤 ∈ 𝑥 ∣ 𝑤𝑅𝑧})
31	30	ex 449	1 ⊢ ((𝑅 Or 𝑥 ∧ (𝑦 ∈ 𝑥 ∧ 𝑧 ∈ 𝑥)) → (𝑦𝑅𝑧 → {𝑤 ∈ 𝑥 ∣ 𝑤𝑅𝑦} [⊊] {𝑤 ∈ 𝑥 ∣ 𝑤𝑅𝑧}))

Syntax hints:  ¬ wn 3   → wi 4   ∧ wa 383   ∧ w3a 1031   ∈ wcel 1977   ≠ wne 2780  {crab 2900   ⊆ wss 3540   ⊊ wpss 3541   class class class wbr 4583   Or wor 4958   [⊊] crpss 6834

This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1713  ax-4 1728  ax-5 1827  ax-6 1875  ax-7 1922  ax-9 1986  ax-10 2006  ax-11 2021  ax-12 2034  ax-13 2234  ax-ext 2590  ax-sep 4709  ax-nul 4717  ax-pr 4833

This theorem depends on definitions:  df-bi 196  df-or 384  df-an 385  df-3an 1033  df-tru 1478  df-ex 1696  df-nf 1701  df-sb 1868  df-eu 2462  df-mo 2463  df-clab 2597  df-cleq 2603  df-clel 2606  df-nfc 2740  df-ne 2782  df-ral 2901  df-rex 2902  df-rab 2905  df-v 3175  df-dif 3543  df-un 3545  df-in 3547  df-ss 3554  df-pss 3556  df-nul 3875  df-if 4037  df-sn 4126  df-pr 4128  df-op 4132  df-br 4584  df-opab 4644  df-po 4959  df-so 4960  df-xp 5044  df-rel 5045  df-rpss 6835

This theorem is referenced by:  fin2so  32566