Theorem suplub2 8636

Description: Bidirectional form of suplub 8635. (Contributed by Mario Carneiro, 6-Sep-2014.)

Hypotheses

Ref	Expression
supmo.1	⊢ (𝜑 → 𝑅 Or 𝐴)
supcl.2	⊢ (𝜑 → ∃𝑥 ∈ 𝐴 (∀𝑦 ∈ 𝐵 ¬ 𝑥𝑅𝑦 ∧ ∀𝑦 ∈ 𝐴 (𝑦𝑅𝑥 → ∃𝑧 ∈ 𝐵 𝑦𝑅𝑧)))
suplub2.3	⊢ (𝜑 → 𝐵 ⊆ 𝐴)

Assertion

Ref	Expression
suplub2	⊢ ((𝜑 ∧ 𝐶 ∈ 𝐴) → (𝐶𝑅sup(𝐵, 𝐴, 𝑅) ↔ ∃𝑧 ∈ 𝐵 𝐶𝑅𝑧))

Distinct variable groups:   𝑥,𝑦,𝑧,𝐴   𝑥,𝑅,𝑦,𝑧   𝑥,𝐵,𝑦,𝑧   𝑧,𝐶

Allowed substitution hints:   𝜑(𝑥,𝑦,𝑧)   𝐶(𝑥,𝑦)

Proof of Theorem suplub2

Dummy variable 𝑤 is distinct from all other variables.

Step	Hyp	Ref	Expression
1		supmo.1	. . . 4 ⊢ (𝜑 → 𝑅 Or 𝐴)
2		supcl.2	. . . 4 ⊢ (𝜑 → ∃𝑥 ∈ 𝐴 (∀𝑦 ∈ 𝐵 ¬ 𝑥𝑅𝑦 ∧ ∀𝑦 ∈ 𝐴 (𝑦𝑅𝑥 → ∃𝑧 ∈ 𝐵 𝑦𝑅𝑧)))
3	1, 2	suplub 8635	. . 3 ⊢ (𝜑 → ((𝐶 ∈ 𝐴 ∧ 𝐶𝑅sup(𝐵, 𝐴, 𝑅)) → ∃𝑧 ∈ 𝐵 𝐶𝑅𝑧))
4	3	expdimp 446	. 2 ⊢ ((𝜑 ∧ 𝐶 ∈ 𝐴) → (𝐶𝑅sup(𝐵, 𝐴, 𝑅) → ∃𝑧 ∈ 𝐵 𝐶𝑅𝑧))
5		breq2 4877	. . . 4 ⊢ (𝑧 = 𝑤 → (𝐶𝑅𝑧 ↔ 𝐶𝑅𝑤))
6	5	cbvrexv 3384	. . 3 ⊢ (∃𝑧 ∈ 𝐵 𝐶𝑅𝑧 ↔ ∃𝑤 ∈ 𝐵 𝐶𝑅𝑤)
7		breq2 4877	. . . . . . 7 ⊢ (sup(𝐵, 𝐴, 𝑅) = 𝑤 → (𝐶𝑅sup(𝐵, 𝐴, 𝑅) ↔ 𝐶𝑅𝑤))
8	7	biimprd 240	. . . . . 6 ⊢ (sup(𝐵, 𝐴, 𝑅) = 𝑤 → (𝐶𝑅𝑤 → 𝐶𝑅sup(𝐵, 𝐴, 𝑅)))
9	8	a1i 11	. . . . 5 ⊢ (((𝜑 ∧ 𝐶 ∈ 𝐴) ∧ 𝑤 ∈ 𝐵) → (sup(𝐵, 𝐴, 𝑅) = 𝑤 → (𝐶𝑅𝑤 → 𝐶𝑅sup(𝐵, 𝐴, 𝑅))))
10	1	ad2antrr 717	. . . . . . 7 ⊢ (((𝜑 ∧ 𝐶 ∈ 𝐴) ∧ 𝑤 ∈ 𝐵) → 𝑅 Or 𝐴)
11		simplr 785	. . . . . . 7 ⊢ (((𝜑 ∧ 𝐶 ∈ 𝐴) ∧ 𝑤 ∈ 𝐵) → 𝐶 ∈ 𝐴)
12		suplub2.3	. . . . . . . . 9 ⊢ (𝜑 → 𝐵 ⊆ 𝐴)
13	12	adantr 474	. . . . . . . 8 ⊢ ((𝜑 ∧ 𝐶 ∈ 𝐴) → 𝐵 ⊆ 𝐴)
14	13	sselda 3827	. . . . . . 7 ⊢ (((𝜑 ∧ 𝐶 ∈ 𝐴) ∧ 𝑤 ∈ 𝐵) → 𝑤 ∈ 𝐴)
15	1, 2	supcl 8633	. . . . . . . 8 ⊢ (𝜑 → sup(𝐵, 𝐴, 𝑅) ∈ 𝐴)
16	15	ad2antrr 717	. . . . . . 7 ⊢ (((𝜑 ∧ 𝐶 ∈ 𝐴) ∧ 𝑤 ∈ 𝐵) → sup(𝐵, 𝐴, 𝑅) ∈ 𝐴)
17		sotr 5285	. . . . . . 7 ⊢ ((𝑅 Or 𝐴 ∧ (𝐶 ∈ 𝐴 ∧ 𝑤 ∈ 𝐴 ∧ sup(𝐵, 𝐴, 𝑅) ∈ 𝐴)) → ((𝐶𝑅𝑤 ∧ 𝑤𝑅sup(𝐵, 𝐴, 𝑅)) → 𝐶𝑅sup(𝐵, 𝐴, 𝑅)))
18	10, 11, 14, 16, 17	syl13anc 1495	. . . . . 6 ⊢ (((𝜑 ∧ 𝐶 ∈ 𝐴) ∧ 𝑤 ∈ 𝐵) → ((𝐶𝑅𝑤 ∧ 𝑤𝑅sup(𝐵, 𝐴, 𝑅)) → 𝐶𝑅sup(𝐵, 𝐴, 𝑅)))
19	18	expcomd 408	. . . . 5 ⊢ (((𝜑 ∧ 𝐶 ∈ 𝐴) ∧ 𝑤 ∈ 𝐵) → (𝑤𝑅sup(𝐵, 𝐴, 𝑅) → (𝐶𝑅𝑤 → 𝐶𝑅sup(𝐵, 𝐴, 𝑅))))
20	1, 2	supub 8634	. . . . . . . 8 ⊢ (𝜑 → (𝑤 ∈ 𝐵 → ¬ sup(𝐵, 𝐴, 𝑅)𝑅𝑤))
21	20	adantr 474	. . . . . . 7 ⊢ ((𝜑 ∧ 𝐶 ∈ 𝐴) → (𝑤 ∈ 𝐵 → ¬ sup(𝐵, 𝐴, 𝑅)𝑅𝑤))
22	21	imp 397	. . . . . 6 ⊢ (((𝜑 ∧ 𝐶 ∈ 𝐴) ∧ 𝑤 ∈ 𝐵) → ¬ sup(𝐵, 𝐴, 𝑅)𝑅𝑤)
23		sotric 5289	. . . . . . . 8 ⊢ ((𝑅 Or 𝐴 ∧ (sup(𝐵, 𝐴, 𝑅) ∈ 𝐴 ∧ 𝑤 ∈ 𝐴)) → (sup(𝐵, 𝐴, 𝑅)𝑅𝑤 ↔ ¬ (sup(𝐵, 𝐴, 𝑅) = 𝑤 ∨ 𝑤𝑅sup(𝐵, 𝐴, 𝑅))))
24	10, 16, 14, 23	syl12anc 870	. . . . . . 7 ⊢ (((𝜑 ∧ 𝐶 ∈ 𝐴) ∧ 𝑤 ∈ 𝐵) → (sup(𝐵, 𝐴, 𝑅)𝑅𝑤 ↔ ¬ (sup(𝐵, 𝐴, 𝑅) = 𝑤 ∨ 𝑤𝑅sup(𝐵, 𝐴, 𝑅))))
25	24	con2bid 346	. . . . . 6 ⊢ (((𝜑 ∧ 𝐶 ∈ 𝐴) ∧ 𝑤 ∈ 𝐵) → ((sup(𝐵, 𝐴, 𝑅) = 𝑤 ∨ 𝑤𝑅sup(𝐵, 𝐴, 𝑅)) ↔ ¬ sup(𝐵, 𝐴, 𝑅)𝑅𝑤))
26	22, 25	mpbird 249	. . . . 5 ⊢ (((𝜑 ∧ 𝐶 ∈ 𝐴) ∧ 𝑤 ∈ 𝐵) → (sup(𝐵, 𝐴, 𝑅) = 𝑤 ∨ 𝑤𝑅sup(𝐵, 𝐴, 𝑅)))
27	9, 19, 26	mpjaod 891	. . . 4 ⊢ (((𝜑 ∧ 𝐶 ∈ 𝐴) ∧ 𝑤 ∈ 𝐵) → (𝐶𝑅𝑤 → 𝐶𝑅sup(𝐵, 𝐴, 𝑅)))
28	27	rexlimdva 3240	. . 3 ⊢ ((𝜑 ∧ 𝐶 ∈ 𝐴) → (∃𝑤 ∈ 𝐵 𝐶𝑅𝑤 → 𝐶𝑅sup(𝐵, 𝐴, 𝑅)))
29	6, 28	syl5bi 234	. 2 ⊢ ((𝜑 ∧ 𝐶 ∈ 𝐴) → (∃𝑧 ∈ 𝐵 𝐶𝑅𝑧 → 𝐶𝑅sup(𝐵, 𝐴, 𝑅)))
30	4, 29	impbid 204	1 ⊢ ((𝜑 ∧ 𝐶 ∈ 𝐴) → (𝐶𝑅sup(𝐵, 𝐴, 𝑅) ↔ ∃𝑧 ∈ 𝐵 𝐶𝑅𝑧))

Syntax hints:  ¬ wn 3   → wi 4   ↔ wb 198   ∧ wa 386   ∨ wo 878   = wceq 1656   ∈ wcel 2164  ∀wral 3117  ∃wrex 3118   ⊆ wss 3798   class class class wbr 4873   Or wor 5262  supcsup 8615

This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1894  ax-4 1908  ax-5 2009  ax-6 2075  ax-7 2112  ax-9 2173  ax-10 2192  ax-11 2207  ax-12 2220  ax-13 2389  ax-ext 2803

This theorem depends on definitions:  df-bi 199  df-an 387  df-or 879  df-3or 1112  df-3an 1113  df-tru 1660  df-ex 1879  df-nf 1883  df-sb 2068  df-mo 2605  df-eu 2640  df-clab 2812  df-cleq 2818  df-clel 2821  df-nfc 2958  df-ne 3000  df-ral 3122  df-rex 3123  df-reu 3124  df-rmo 3125  df-rab 3126  df-v 3416  df-sbc 3663  df-dif 3801  df-un 3803  df-in 3805  df-ss 3812  df-nul 4145  df-if 4307  df-sn 4398  df-pr 4400  df-op 4404  df-uni 4659  df-br 4874  df-po 5263  df-so 5264  df-iota 6086  df-riota 6866  df-sup 8617

This theorem is referenced by:  infglbb  8666  suprlub  11317  supxrlub  12443