Theorem cdleme31snd 41010

Description: Part of proof of Lemma D in [Crawley] p. 113. (Contributed by NM, 1-Apr-2013.)

Hypotheses

Ref	Expression
cdleme31snd.d	⊢ 𝐷 = ((𝑡 ∨ 𝑈) ∧ (𝑄 ∨ ((𝑃 ∨ 𝑡) ∧ 𝑊)))
cdleme31snd.n	⊢ 𝑁 = ((𝑣 ∨ 𝑉) ∧ (𝑃 ∨ ((𝑄 ∨ 𝑣) ∧ 𝑊)))
cdleme31snd.e	⊢ 𝐸 = ((𝑂 ∨ 𝑈) ∧ (𝑄 ∨ ((𝑃 ∨ 𝑂) ∧ 𝑊)))
cdleme31snd.o	⊢ 𝑂 = ((𝑆 ∨ 𝑉) ∧ (𝑃 ∨ ((𝑄 ∨ 𝑆) ∧ 𝑊)))

Assertion

Ref	Expression
cdleme31snd	⊢ (𝑆 ∈ 𝐴 → ⦋𝑆 / 𝑣⦌⦋𝑁 / 𝑡⦌𝐷 = 𝐸)

Distinct variable groups:   𝑣,𝐴   𝑣,𝐷   𝑣,𝑡, ∨   𝑡, ∧ ,𝑣   𝑡,𝑂   𝑡,𝑃,𝑣   𝑡,𝑄,𝑣   𝑣,𝑆   𝑡,𝑈,𝑣   𝑣,𝑉   𝑡,𝑊,𝑣

Allowed substitution hints:   𝐴(𝑡)   𝐷(𝑡)   𝑆(𝑡)   𝐸(𝑣,𝑡)   𝑁(𝑣,𝑡)   𝑂(𝑣)   𝑉(𝑡)

Proof of Theorem cdleme31snd

Step	Hyp	Ref	Expression
1		csbnestgw 4378	. 2 ⊢ (𝑆 ∈ 𝐴 → ⦋𝑆 / 𝑣⦌⦋𝑁 / 𝑡⦌𝐷 = ⦋⦋𝑆 / 𝑣⦌𝑁 / 𝑡⦌𝐷)
2		cdleme31snd.n	. . . . 5 ⊢ 𝑁 = ((𝑣 ∨ 𝑉) ∧ (𝑃 ∨ ((𝑄 ∨ 𝑣) ∧ 𝑊)))
3		cdleme31snd.o	. . . . 5 ⊢ 𝑂 = ((𝑆 ∨ 𝑉) ∧ (𝑃 ∨ ((𝑄 ∨ 𝑆) ∧ 𝑊)))
4	2, 3	cdleme31sc 41008	. . . 4 ⊢ (𝑆 ∈ 𝐴 → ⦋𝑆 / 𝑣⦌𝑁 = 𝑂)
5	4	csbeq1d 3856	. . 3 ⊢ (𝑆 ∈ 𝐴 → ⦋⦋𝑆 / 𝑣⦌𝑁 / 𝑡⦌𝐷 = ⦋𝑂 / 𝑡⦌𝐷)
6	3	ovexi 7430	. . . 4 ⊢ 𝑂 ∈ V
7		cdleme31snd.d	. . . . 5 ⊢ 𝐷 = ((𝑡 ∨ 𝑈) ∧ (𝑄 ∨ ((𝑃 ∨ 𝑡) ∧ 𝑊)))
8		cdleme31snd.e	. . . . 5 ⊢ 𝐸 = ((𝑂 ∨ 𝑈) ∧ (𝑄 ∨ ((𝑃 ∨ 𝑂) ∧ 𝑊)))
9	7, 8	cdleme31sc 41008	. . . 4 ⊢ (𝑂 ∈ V → ⦋𝑂 / 𝑡⦌𝐷 = 𝐸)
10	6, 9	ax-mp 5	. . 3 ⊢ ⦋𝑂 / 𝑡⦌𝐷 = 𝐸
11	5, 10	eqtrdi 2813	. 2 ⊢ (𝑆 ∈ 𝐴 → ⦋⦋𝑆 / 𝑣⦌𝑁 / 𝑡⦌𝐷 = 𝐸)
12	1, 11	eqtrd 2797	1 ⊢ (𝑆 ∈ 𝐴 → ⦋𝑆 / 𝑣⦌⦋𝑁 / 𝑡⦌𝐷 = 𝐸)

Syntax hints:   → wi 4   = wceq 1560   ∈ wcel 2142  Vcvv 3454  ⦋csb 3852  (class class class)co 7396

This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1815  ax-4 1829  ax-5 1930  ax-6 1987  ax-7 2028  ax-8 2144  ax-9 2152  ax-10 2175  ax-11 2191  ax-12 2212  ax-ext 2734  ax-nul 5256

This theorem depends on definitions:  df-bi 209  df-an 400  df-or 859  df-3an 1100  df-tru 1563  df-fal 1573  df-ex 1800  df-nf 1804  df-sb 2091  df-clab 2741  df-cleq 2754  df-clel 2837  df-nfc 2911  df-ne 2958  df-rab 3415  df-v 3456  df-sbc 3745  df-csb 3853  df-dif 3907  df-un 3909  df-ss 3921  df-nul 4286  df-if 4481  df-sn 4583  df-pr 4585  df-op 4589  df-uni 4866  df-br 5101  df-iota 6477  df-fv 6529  df-ov 7399

This theorem is referenced by:  cdlemeg46ngfr  41142