Theorem dmdsl3 29504

Description: Sublattice mapping for a dual-modular pair. Part of Theorem 1.3 of [MaedaMaeda] p. 2. (Contributed by NM, 26-Apr-2006.) (New usage is discouraged.)

Assertion

Ref	Expression
dmdsl3	⊢ (((𝐴 ∈ Cℋ ∧ 𝐵 ∈ Cℋ ∧ 𝐶 ∈ Cℋ ) ∧ (𝐵 𝑀ℋ* 𝐴 ∧ 𝐴 ⊆ 𝐶 ∧ 𝐶 ⊆ (𝐴 ∨ℋ 𝐵))) → ((𝐶 ∩ 𝐵) ∨ℋ 𝐴) = 𝐶)

Proof of Theorem dmdsl3

Step	Hyp	Ref	Expression
1		dmdi 29491	. . . . . 6 ⊢ (((𝐵 ∈ Cℋ ∧ 𝐴 ∈ Cℋ ∧ 𝐶 ∈ Cℋ ) ∧ (𝐵 𝑀ℋ* 𝐴 ∧ 𝐴 ⊆ 𝐶)) → ((𝐶 ∩ 𝐵) ∨ℋ 𝐴) = (𝐶 ∩ (𝐵 ∨ℋ 𝐴)))
2	1	exp32 632	. . . . 5 ⊢ ((𝐵 ∈ Cℋ ∧ 𝐴 ∈ Cℋ ∧ 𝐶 ∈ Cℋ ) → (𝐵 𝑀ℋ* 𝐴 → (𝐴 ⊆ 𝐶 → ((𝐶 ∩ 𝐵) ∨ℋ 𝐴) = (𝐶 ∩ (𝐵 ∨ℋ 𝐴)))))
3	2	3com12 1118	. . . 4 ⊢ ((𝐴 ∈ Cℋ ∧ 𝐵 ∈ Cℋ ∧ 𝐶 ∈ Cℋ ) → (𝐵 𝑀ℋ* 𝐴 → (𝐴 ⊆ 𝐶 → ((𝐶 ∩ 𝐵) ∨ℋ 𝐴) = (𝐶 ∩ (𝐵 ∨ℋ 𝐴)))))
4	3	imp32 448	. . 3 ⊢ (((𝐴 ∈ Cℋ ∧ 𝐵 ∈ Cℋ ∧ 𝐶 ∈ Cℋ ) ∧ (𝐵 𝑀ℋ* 𝐴 ∧ 𝐴 ⊆ 𝐶)) → ((𝐶 ∩ 𝐵) ∨ℋ 𝐴) = (𝐶 ∩ (𝐵 ∨ℋ 𝐴)))
5	4	3adantr3 1177	. 2 ⊢ (((𝐴 ∈ Cℋ ∧ 𝐵 ∈ Cℋ ∧ 𝐶 ∈ Cℋ ) ∧ (𝐵 𝑀ℋ* 𝐴 ∧ 𝐴 ⊆ 𝐶 ∧ 𝐶 ⊆ (𝐴 ∨ℋ 𝐵))) → ((𝐶 ∩ 𝐵) ∨ℋ 𝐴) = (𝐶 ∩ (𝐵 ∨ℋ 𝐴)))
6		chjcom 28695	. . . . . 6 ⊢ ((𝐴 ∈ Cℋ ∧ 𝐵 ∈ Cℋ ) → (𝐴 ∨ℋ 𝐵) = (𝐵 ∨ℋ 𝐴))
7	6	ineq2d 3957	. . . . 5 ⊢ ((𝐴 ∈ Cℋ ∧ 𝐵 ∈ Cℋ ) → (𝐶 ∩ (𝐴 ∨ℋ 𝐵)) = (𝐶 ∩ (𝐵 ∨ℋ 𝐴)))
8	7	3adant3 1127	. . . 4 ⊢ ((𝐴 ∈ Cℋ ∧ 𝐵 ∈ Cℋ ∧ 𝐶 ∈ Cℋ ) → (𝐶 ∩ (𝐴 ∨ℋ 𝐵)) = (𝐶 ∩ (𝐵 ∨ℋ 𝐴)))
9		df-ss 3729	. . . . 5 ⊢ (𝐶 ⊆ (𝐴 ∨ℋ 𝐵) ↔ (𝐶 ∩ (𝐴 ∨ℋ 𝐵)) = 𝐶)
10	9	biimpi 206	. . . 4 ⊢ (𝐶 ⊆ (𝐴 ∨ℋ 𝐵) → (𝐶 ∩ (𝐴 ∨ℋ 𝐵)) = 𝐶)
11	8, 10	sylan9req 2815	. . 3 ⊢ (((𝐴 ∈ Cℋ ∧ 𝐵 ∈ Cℋ ∧ 𝐶 ∈ Cℋ ) ∧ 𝐶 ⊆ (𝐴 ∨ℋ 𝐵)) → (𝐶 ∩ (𝐵 ∨ℋ 𝐴)) = 𝐶)
12	11	3ad2antr3 1206	. 2 ⊢ (((𝐴 ∈ Cℋ ∧ 𝐵 ∈ Cℋ ∧ 𝐶 ∈ Cℋ ) ∧ (𝐵 𝑀ℋ* 𝐴 ∧ 𝐴 ⊆ 𝐶 ∧ 𝐶 ⊆ (𝐴 ∨ℋ 𝐵))) → (𝐶 ∩ (𝐵 ∨ℋ 𝐴)) = 𝐶)
13	5, 12	eqtrd 2794	1 ⊢ (((𝐴 ∈ Cℋ ∧ 𝐵 ∈ Cℋ ∧ 𝐶 ∈ Cℋ ) ∧ (𝐵 𝑀ℋ* 𝐴 ∧ 𝐴 ⊆ 𝐶 ∧ 𝐶 ⊆ (𝐴 ∨ℋ 𝐵))) → ((𝐶 ∩ 𝐵) ∨ℋ 𝐴) = 𝐶)

Syntax hints:   → wi 4   ∧ wa 383   ∧ w3a 1072   = wceq 1632   ∈ wcel 2139   ∩ cin 3714   ⊆ wss 3715   class class class wbr 4804  (class class class)co 6814   C_ℋ cch 28116   ∨_ℋ chj 28120   𝑀_ℋ^* cdmd 28154

This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1871  ax-4 1886  ax-5 1988  ax-6 2054  ax-7 2090  ax-9 2148  ax-10 2168  ax-11 2183  ax-12 2196  ax-13 2391  ax-ext 2740  ax-sep 4933  ax-nul 4941  ax-pr 5055  ax-hilex 28186

This theorem depends on definitions:  df-bi 197  df-or 384  df-an 385  df-3an 1074  df-tru 1635  df-ex 1854  df-nf 1859  df-sb 2047  df-eu 2611  df-mo 2612  df-clab 2747  df-cleq 2753  df-clel 2756  df-nfc 2891  df-ral 3055  df-rex 3056  df-rab 3059  df-v 3342  df-sbc 3577  df-dif 3718  df-un 3720  df-in 3722  df-ss 3729  df-nul 4059  df-if 4231  df-pw 4304  df-sn 4322  df-pr 4324  df-op 4328  df-uni 4589  df-br 4805  df-opab 4865  df-id 5174  df-xp 5272  df-rel 5273  df-cnv 5274  df-co 5275  df-dm 5276  df-rn 5277  df-res 5278  df-ima 5279  df-iota 6012  df-fun 6051  df-fv 6057  df-ov 6817  df-oprab 6818  df-mpt2 6819  df-sh 28394  df-ch 28408  df-chj 28499  df-dmd 29470

This theorem is referenced by:  mdslle1i  29506  mdslj1i  29508  mdslj2i  29509  mdslmd1lem1  29514