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Theorem ipodrsima 18499

Description: The monotone image of a directed set. (Contributed by Stefan O'Rear, 2-Apr-2015.)

**Hypotheses**
Ref	Expression
ipodrsima.f	⊢ (𝜑 → 𝐹 Fn 𝒫 𝐴)
ipodrsima.m	⊢ ((𝜑 ∧ (𝑢 ⊆ 𝑣 ∧ 𝑣 ⊆ 𝐴)) → (𝐹‘𝑢) ⊆ (𝐹‘𝑣))
ipodrsima.d	⊢ (𝜑 → (toInc‘𝐵) ∈ Dirset)
ipodrsima.s	⊢ (𝜑 → 𝐵 ⊆ 𝒫 𝐴)
ipodrsima.a	⊢ (𝜑 → (𝐹 “ 𝐵) ∈ 𝑉)

**Assertion**
Ref	Expression
ipodrsima	⊢ (𝜑 → (toInc‘(𝐹 “ 𝐵)) ∈ Dirset)

Distinct variable groups: 𝜑,𝑢,𝑣 𝑢,𝐴,𝑣 𝑢,𝐹,𝑣 Allowed substitution hints: 𝐵(𝑣,𝑢) 𝑉(𝑣,𝑢)

Proof of Theorem ipodrsima Dummy variables 𝑎 𝑏 𝑐 𝑥 𝑦 𝑧 are mutually distinct and distinct from all other variables.

Step	Hyp	Ref	Expression
1		ipodrsima.a	. . 3 ⊢ (𝜑 → (𝐹 “ 𝐵) ∈ 𝑉)
2	1	elexd 3494	. 2 ⊢ (𝜑 → (𝐹 “ 𝐵) ∈ V)
3		ipodrsima.d	. . . . 5 ⊢ (𝜑 → (toInc‘𝐵) ∈ Dirset)
4		isipodrs 18495	. . . . 5 ⊢ ((toInc‘𝐵) ∈ Dirset ↔ (𝐵 ∈ V ∧ 𝐵 ≠ ∅ ∧ ∀𝑎 ∈ 𝐵 ∀𝑏 ∈ 𝐵 ∃𝑐 ∈ 𝐵 (𝑎 ∪ 𝑏) ⊆ 𝑐))
5	3, 4	sylib 217	. . . 4 ⊢ (𝜑 → (𝐵 ∈ V ∧ 𝐵 ≠ ∅ ∧ ∀𝑎 ∈ 𝐵 ∀𝑏 ∈ 𝐵 ∃𝑐 ∈ 𝐵 (𝑎 ∪ 𝑏) ⊆ 𝑐))
6	5	simp2d 1142	. . 3 ⊢ (𝜑 → 𝐵 ≠ ∅)
7		ipodrsima.f	. . . . 5 ⊢ (𝜑 → 𝐹 Fn 𝒫 𝐴)
8		ipodrsima.s	. . . . 5 ⊢ (𝜑 → 𝐵 ⊆ 𝒫 𝐴)
9		fnimaeq0 6683	. . . . 5 ⊢ ((𝐹 Fn 𝒫 𝐴 ∧ 𝐵 ⊆ 𝒫 𝐴) → ((𝐹 “ 𝐵) = ∅ ↔ 𝐵 = ∅))
10	7, 8, 9	syl2anc 583	. . . 4 ⊢ (𝜑 → ((𝐹 “ 𝐵) = ∅ ↔ 𝐵 = ∅))
11	10	necon3bid 2984	. . 3 ⊢ (𝜑 → ((𝐹 “ 𝐵) ≠ ∅ ↔ 𝐵 ≠ ∅))
12	6, 11	mpbird 257	. 2 ⊢ (𝜑 → (𝐹 “ 𝐵) ≠ ∅)
13	5	simp3d 1143	. . . 4 ⊢ (𝜑 → ∀𝑎 ∈ 𝐵 ∀𝑏 ∈ 𝐵 ∃𝑐 ∈ 𝐵 (𝑎 ∪ 𝑏) ⊆ 𝑐)
14		simplll 772	. . . . . . . . . . . 12 ⊢ ((((𝜑 ∧ 𝑎 ∈ 𝐵) ∧ (𝑏 ∈ 𝐵 ∧ 𝑐 ∈ 𝐵)) ∧ 𝑎 ⊆ 𝑐) → 𝜑)
15		simpr 484	. . . . . . . . . . . 12 ⊢ ((((𝜑 ∧ 𝑎 ∈ 𝐵) ∧ (𝑏 ∈ 𝐵 ∧ 𝑐 ∈ 𝐵)) ∧ 𝑎 ⊆ 𝑐) → 𝑎 ⊆ 𝑐)
16	8	ad2antrr 723	. . . . . . . . . . . . . . 15 ⊢ (((𝜑 ∧ 𝑎 ∈ 𝐵) ∧ (𝑏 ∈ 𝐵 ∧ 𝑐 ∈ 𝐵)) → 𝐵 ⊆ 𝒫 𝐴)
17		simprr 770	. . . . . . . . . . . . . . 15 ⊢ (((𝜑 ∧ 𝑎 ∈ 𝐵) ∧ (𝑏 ∈ 𝐵 ∧ 𝑐 ∈ 𝐵)) → 𝑐 ∈ 𝐵)
18	16, 17	sseldd 3983	. . . . . . . . . . . . . 14 ⊢ (((𝜑 ∧ 𝑎 ∈ 𝐵) ∧ (𝑏 ∈ 𝐵 ∧ 𝑐 ∈ 𝐵)) → 𝑐 ∈ 𝒫 𝐴)
19	18	elpwid 4611	. . . . . . . . . . . . 13 ⊢ (((𝜑 ∧ 𝑎 ∈ 𝐵) ∧ (𝑏 ∈ 𝐵 ∧ 𝑐 ∈ 𝐵)) → 𝑐 ⊆ 𝐴)
20	19	adantr 480	. . . . . . . . . . . 12 ⊢ ((((𝜑 ∧ 𝑎 ∈ 𝐵) ∧ (𝑏 ∈ 𝐵 ∧ 𝑐 ∈ 𝐵)) ∧ 𝑎 ⊆ 𝑐) → 𝑐 ⊆ 𝐴)
21		vex 3477	. . . . . . . . . . . . 13 ⊢ 𝑎 ∈ V
22		vex 3477	. . . . . . . . . . . . 13 ⊢ 𝑐 ∈ V
23		sseq12 4009	. . . . . . . . . . . . . . . 16 ⊢ ((𝑢 = 𝑎 ∧ 𝑣 = 𝑐) → (𝑢 ⊆ 𝑣 ↔ 𝑎 ⊆ 𝑐))
24		sseq1 4007	. . . . . . . . . . . . . . . . 17 ⊢ (𝑣 = 𝑐 → (𝑣 ⊆ 𝐴 ↔ 𝑐 ⊆ 𝐴))
25	24	adantl 481	. . . . . . . . . . . . . . . 16 ⊢ ((𝑢 = 𝑎 ∧ 𝑣 = 𝑐) → (𝑣 ⊆ 𝐴 ↔ 𝑐 ⊆ 𝐴))
26	23, 25	anbi12d 630	. . . . . . . . . . . . . . 15 ⊢ ((𝑢 = 𝑎 ∧ 𝑣 = 𝑐) → ((𝑢 ⊆ 𝑣 ∧ 𝑣 ⊆ 𝐴) ↔ (𝑎 ⊆ 𝑐 ∧ 𝑐 ⊆ 𝐴)))
27	26	anbi2d 628	. . . . . . . . . . . . . 14 ⊢ ((𝑢 = 𝑎 ∧ 𝑣 = 𝑐) → ((𝜑 ∧ (𝑢 ⊆ 𝑣 ∧ 𝑣 ⊆ 𝐴)) ↔ (𝜑 ∧ (𝑎 ⊆ 𝑐 ∧ 𝑐 ⊆ 𝐴))))
28		fveq2 6891	. . . . . . . . . . . . . . 15 ⊢ (𝑢 = 𝑎 → (𝐹‘𝑢) = (𝐹‘𝑎))
29		fveq2 6891	. . . . . . . . . . . . . . 15 ⊢ (𝑣 = 𝑐 → (𝐹‘𝑣) = (𝐹‘𝑐))
30		sseq12 4009	. . . . . . . . . . . . . . 15 ⊢ (((𝐹‘𝑢) = (𝐹‘𝑎) ∧ (𝐹‘𝑣) = (𝐹‘𝑐)) → ((𝐹‘𝑢) ⊆ (𝐹‘𝑣) ↔ (𝐹‘𝑎) ⊆ (𝐹‘𝑐)))
31	28, 29, 30	syl2an 595	. . . . . . . . . . . . . 14 ⊢ ((𝑢 = 𝑎 ∧ 𝑣 = 𝑐) → ((𝐹‘𝑢) ⊆ (𝐹‘𝑣) ↔ (𝐹‘𝑎) ⊆ (𝐹‘𝑐)))
32	27, 31	imbi12d 344	. . . . . . . . . . . . 13 ⊢ ((𝑢 = 𝑎 ∧ 𝑣 = 𝑐) → (((𝜑 ∧ (𝑢 ⊆ 𝑣 ∧ 𝑣 ⊆ 𝐴)) → (𝐹‘𝑢) ⊆ (𝐹‘𝑣)) ↔ ((𝜑 ∧ (𝑎 ⊆ 𝑐 ∧ 𝑐 ⊆ 𝐴)) → (𝐹‘𝑎) ⊆ (𝐹‘𝑐))))
33		ipodrsima.m	. . . . . . . . . . . . 13 ⊢ ((𝜑 ∧ (𝑢 ⊆ 𝑣 ∧ 𝑣 ⊆ 𝐴)) → (𝐹‘𝑢) ⊆ (𝐹‘𝑣))
34	21, 22, 32, 33	vtocl2 3554	. . . . . . . . . . . 12 ⊢ ((𝜑 ∧ (𝑎 ⊆ 𝑐 ∧ 𝑐 ⊆ 𝐴)) → (𝐹‘𝑎) ⊆ (𝐹‘𝑐))
35	14, 15, 20, 34	syl12anc 834	. . . . . . . . . . 11 ⊢ ((((𝜑 ∧ 𝑎 ∈ 𝐵) ∧ (𝑏 ∈ 𝐵 ∧ 𝑐 ∈ 𝐵)) ∧ 𝑎 ⊆ 𝑐) → (𝐹‘𝑎) ⊆ (𝐹‘𝑐))
36	35	ex 412	. . . . . . . . . 10 ⊢ (((𝜑 ∧ 𝑎 ∈ 𝐵) ∧ (𝑏 ∈ 𝐵 ∧ 𝑐 ∈ 𝐵)) → (𝑎 ⊆ 𝑐 → (𝐹‘𝑎) ⊆ (𝐹‘𝑐)))
37		simplll 772	. . . . . . . . . . . 12 ⊢ ((((𝜑 ∧ 𝑎 ∈ 𝐵) ∧ (𝑏 ∈ 𝐵 ∧ 𝑐 ∈ 𝐵)) ∧ 𝑏 ⊆ 𝑐) → 𝜑)
38		simpr 484	. . . . . . . . . . . 12 ⊢ ((((𝜑 ∧ 𝑎 ∈ 𝐵) ∧ (𝑏 ∈ 𝐵 ∧ 𝑐 ∈ 𝐵)) ∧ 𝑏 ⊆ 𝑐) → 𝑏 ⊆ 𝑐)
39	19	adantr 480	. . . . . . . . . . . 12 ⊢ ((((𝜑 ∧ 𝑎 ∈ 𝐵) ∧ (𝑏 ∈ 𝐵 ∧ 𝑐 ∈ 𝐵)) ∧ 𝑏 ⊆ 𝑐) → 𝑐 ⊆ 𝐴)
40		vex 3477	. . . . . . . . . . . . 13 ⊢ 𝑏 ∈ V
41		sseq12 4009	. . . . . . . . . . . . . . . 16 ⊢ ((𝑢 = 𝑏 ∧ 𝑣 = 𝑐) → (𝑢 ⊆ 𝑣 ↔ 𝑏 ⊆ 𝑐))
42	24	adantl 481	. . . . . . . . . . . . . . . 16 ⊢ ((𝑢 = 𝑏 ∧ 𝑣 = 𝑐) → (𝑣 ⊆ 𝐴 ↔ 𝑐 ⊆ 𝐴))
43	41, 42	anbi12d 630	. . . . . . . . . . . . . . 15 ⊢ ((𝑢 = 𝑏 ∧ 𝑣 = 𝑐) → ((𝑢 ⊆ 𝑣 ∧ 𝑣 ⊆ 𝐴) ↔ (𝑏 ⊆ 𝑐 ∧ 𝑐 ⊆ 𝐴)))
44	43	anbi2d 628	. . . . . . . . . . . . . 14 ⊢ ((𝑢 = 𝑏 ∧ 𝑣 = 𝑐) → ((𝜑 ∧ (𝑢 ⊆ 𝑣 ∧ 𝑣 ⊆ 𝐴)) ↔ (𝜑 ∧ (𝑏 ⊆ 𝑐 ∧ 𝑐 ⊆ 𝐴))))
45		fveq2 6891	. . . . . . . . . . . . . . 15 ⊢ (𝑢 = 𝑏 → (𝐹‘𝑢) = (𝐹‘𝑏))
46		sseq12 4009	. . . . . . . . . . . . . . 15 ⊢ (((𝐹‘𝑢) = (𝐹‘𝑏) ∧ (𝐹‘𝑣) = (𝐹‘𝑐)) → ((𝐹‘𝑢) ⊆ (𝐹‘𝑣) ↔ (𝐹‘𝑏) ⊆ (𝐹‘𝑐)))
47	45, 29, 46	syl2an 595	. . . . . . . . . . . . . 14 ⊢ ((𝑢 = 𝑏 ∧ 𝑣 = 𝑐) → ((𝐹‘𝑢) ⊆ (𝐹‘𝑣) ↔ (𝐹‘𝑏) ⊆ (𝐹‘𝑐)))
48	44, 47	imbi12d 344	. . . . . . . . . . . . 13 ⊢ ((𝑢 = 𝑏 ∧ 𝑣 = 𝑐) → (((𝜑 ∧ (𝑢 ⊆ 𝑣 ∧ 𝑣 ⊆ 𝐴)) → (𝐹‘𝑢) ⊆ (𝐹‘𝑣)) ↔ ((𝜑 ∧ (𝑏 ⊆ 𝑐 ∧ 𝑐 ⊆ 𝐴)) → (𝐹‘𝑏) ⊆ (𝐹‘𝑐))))
49	40, 22, 48, 33	vtocl2 3554	. . . . . . . . . . . 12 ⊢ ((𝜑 ∧ (𝑏 ⊆ 𝑐 ∧ 𝑐 ⊆ 𝐴)) → (𝐹‘𝑏) ⊆ (𝐹‘𝑐))
50	37, 38, 39, 49	syl12anc 834	. . . . . . . . . . 11 ⊢ ((((𝜑 ∧ 𝑎 ∈ 𝐵) ∧ (𝑏 ∈ 𝐵 ∧ 𝑐 ∈ 𝐵)) ∧ 𝑏 ⊆ 𝑐) → (𝐹‘𝑏) ⊆ (𝐹‘𝑐))
51	50	ex 412	. . . . . . . . . 10 ⊢ (((𝜑 ∧ 𝑎 ∈ 𝐵) ∧ (𝑏 ∈ 𝐵 ∧ 𝑐 ∈ 𝐵)) → (𝑏 ⊆ 𝑐 → (𝐹‘𝑏) ⊆ (𝐹‘𝑐)))
52	36, 51	anim12d 608	. . . . . . . . 9 ⊢ (((𝜑 ∧ 𝑎 ∈ 𝐵) ∧ (𝑏 ∈ 𝐵 ∧ 𝑐 ∈ 𝐵)) → ((𝑎 ⊆ 𝑐 ∧ 𝑏 ⊆ 𝑐) → ((𝐹‘𝑎) ⊆ (𝐹‘𝑐) ∧ (𝐹‘𝑏) ⊆ (𝐹‘𝑐))))
53		unss 4184	. . . . . . . . 9 ⊢ ((𝑎 ⊆ 𝑐 ∧ 𝑏 ⊆ 𝑐) ↔ (𝑎 ∪ 𝑏) ⊆ 𝑐)
54		unss 4184	. . . . . . . . 9 ⊢ (((𝐹‘𝑎) ⊆ (𝐹‘𝑐) ∧ (𝐹‘𝑏) ⊆ (𝐹‘𝑐)) ↔ ((𝐹‘𝑎) ∪ (𝐹‘𝑏)) ⊆ (𝐹‘𝑐))
55	52, 53, 54	3imtr3g 295	. . . . . . . 8 ⊢ (((𝜑 ∧ 𝑎 ∈ 𝐵) ∧ (𝑏 ∈ 𝐵 ∧ 𝑐 ∈ 𝐵)) → ((𝑎 ∪ 𝑏) ⊆ 𝑐 → ((𝐹‘𝑎) ∪ (𝐹‘𝑏)) ⊆ (𝐹‘𝑐)))
56	55	anassrs 467	. . . . . . 7 ⊢ ((((𝜑 ∧ 𝑎 ∈ 𝐵) ∧ 𝑏 ∈ 𝐵) ∧ 𝑐 ∈ 𝐵) → ((𝑎 ∪ 𝑏) ⊆ 𝑐 → ((𝐹‘𝑎) ∪ (𝐹‘𝑏)) ⊆ (𝐹‘𝑐)))
57	56	reximdva 3167	. . . . . 6 ⊢ (((𝜑 ∧ 𝑎 ∈ 𝐵) ∧ 𝑏 ∈ 𝐵) → (∃𝑐 ∈ 𝐵 (𝑎 ∪ 𝑏) ⊆ 𝑐 → ∃𝑐 ∈ 𝐵 ((𝐹‘𝑎) ∪ (𝐹‘𝑏)) ⊆ (𝐹‘𝑐)))
58	57	ralimdva 3166	. . . . 5 ⊢ ((𝜑 ∧ 𝑎 ∈ 𝐵) → (∀𝑏 ∈ 𝐵 ∃𝑐 ∈ 𝐵 (𝑎 ∪ 𝑏) ⊆ 𝑐 → ∀𝑏 ∈ 𝐵 ∃𝑐 ∈ 𝐵 ((𝐹‘𝑎) ∪ (𝐹‘𝑏)) ⊆ (𝐹‘𝑐)))
59	58	ralimdva 3166	. . . 4 ⊢ (𝜑 → (∀𝑎 ∈ 𝐵 ∀𝑏 ∈ 𝐵 ∃𝑐 ∈ 𝐵 (𝑎 ∪ 𝑏) ⊆ 𝑐 → ∀𝑎 ∈ 𝐵 ∀𝑏 ∈ 𝐵 ∃𝑐 ∈ 𝐵 ((𝐹‘𝑎) ∪ (𝐹‘𝑏)) ⊆ (𝐹‘𝑐)))
60	13, 59	mpd 15	. . 3 ⊢ (𝜑 → ∀𝑎 ∈ 𝐵 ∀𝑏 ∈ 𝐵 ∃𝑐 ∈ 𝐵 ((𝐹‘𝑎) ∪ (𝐹‘𝑏)) ⊆ (𝐹‘𝑐))
61		uneq1 4156	. . . . . . . . 9 ⊢ (𝑥 = (𝐹‘𝑎) → (𝑥 ∪ 𝑦) = ((𝐹‘𝑎) ∪ 𝑦))
62	61	sseq1d 4013	. . . . . . . 8 ⊢ (𝑥 = (𝐹‘𝑎) → ((𝑥 ∪ 𝑦) ⊆ 𝑧 ↔ ((𝐹‘𝑎) ∪ 𝑦) ⊆ 𝑧))
63	62	rexbidv 3177	. . . . . . 7 ⊢ (𝑥 = (𝐹‘𝑎) → (∃𝑧 ∈ (𝐹 “ 𝐵)(𝑥 ∪ 𝑦) ⊆ 𝑧 ↔ ∃𝑧 ∈ (𝐹 “ 𝐵)((𝐹‘𝑎) ∪ 𝑦) ⊆ 𝑧))
64	63	ralbidv 3176	. . . . . 6 ⊢ (𝑥 = (𝐹‘𝑎) → (∀𝑦 ∈ (𝐹 “ 𝐵)∃𝑧 ∈ (𝐹 “ 𝐵)(𝑥 ∪ 𝑦) ⊆ 𝑧 ↔ ∀𝑦 ∈ (𝐹 “ 𝐵)∃𝑧 ∈ (𝐹 “ 𝐵)((𝐹‘𝑎) ∪ 𝑦) ⊆ 𝑧))
65	64	ralima 7242	. . . . 5 ⊢ ((𝐹 Fn 𝒫 𝐴 ∧ 𝐵 ⊆ 𝒫 𝐴) → (∀𝑥 ∈ (𝐹 “ 𝐵)∀𝑦 ∈ (𝐹 “ 𝐵)∃𝑧 ∈ (𝐹 “ 𝐵)(𝑥 ∪ 𝑦) ⊆ 𝑧 ↔ ∀𝑎 ∈ 𝐵 ∀𝑦 ∈ (𝐹 “ 𝐵)∃𝑧 ∈ (𝐹 “ 𝐵)((𝐹‘𝑎) ∪ 𝑦) ⊆ 𝑧))
66	7, 8, 65	syl2anc 583	. . . 4 ⊢ (𝜑 → (∀𝑥 ∈ (𝐹 “ 𝐵)∀𝑦 ∈ (𝐹 “ 𝐵)∃𝑧 ∈ (𝐹 “ 𝐵)(𝑥 ∪ 𝑦) ⊆ 𝑧 ↔ ∀𝑎 ∈ 𝐵 ∀𝑦 ∈ (𝐹 “ 𝐵)∃𝑧 ∈ (𝐹 “ 𝐵)((𝐹‘𝑎) ∪ 𝑦) ⊆ 𝑧))
67		uneq2 4157	. . . . . . . . . 10 ⊢ (𝑦 = (𝐹‘𝑏) → ((𝐹‘𝑎) ∪ 𝑦) = ((𝐹‘𝑎) ∪ (𝐹‘𝑏)))
68	67	sseq1d 4013	. . . . . . . . 9 ⊢ (𝑦 = (𝐹‘𝑏) → (((𝐹‘𝑎) ∪ 𝑦) ⊆ 𝑧 ↔ ((𝐹‘𝑎) ∪ (𝐹‘𝑏)) ⊆ 𝑧))
69	68	rexbidv 3177	. . . . . . . 8 ⊢ (𝑦 = (𝐹‘𝑏) → (∃𝑧 ∈ (𝐹 “ 𝐵)((𝐹‘𝑎) ∪ 𝑦) ⊆ 𝑧 ↔ ∃𝑧 ∈ (𝐹 “ 𝐵)((𝐹‘𝑎) ∪ (𝐹‘𝑏)) ⊆ 𝑧))
70	69	ralima 7242	. . . . . . 7 ⊢ ((𝐹 Fn 𝒫 𝐴 ∧ 𝐵 ⊆ 𝒫 𝐴) → (∀𝑦 ∈ (𝐹 “ 𝐵)∃𝑧 ∈ (𝐹 “ 𝐵)((𝐹‘𝑎) ∪ 𝑦) ⊆ 𝑧 ↔ ∀𝑏 ∈ 𝐵 ∃𝑧 ∈ (𝐹 “ 𝐵)((𝐹‘𝑎) ∪ (𝐹‘𝑏)) ⊆ 𝑧))
71	7, 8, 70	syl2anc 583	. . . . . 6 ⊢ (𝜑 → (∀𝑦 ∈ (𝐹 “ 𝐵)∃𝑧 ∈ (𝐹 “ 𝐵)((𝐹‘𝑎) ∪ 𝑦) ⊆ 𝑧 ↔ ∀𝑏 ∈ 𝐵 ∃𝑧 ∈ (𝐹 “ 𝐵)((𝐹‘𝑎) ∪ (𝐹‘𝑏)) ⊆ 𝑧))
72		sseq2 4008	. . . . . . . . 9 ⊢ (𝑧 = (𝐹‘𝑐) → (((𝐹‘𝑎) ∪ (𝐹‘𝑏)) ⊆ 𝑧 ↔ ((𝐹‘𝑎) ∪ (𝐹‘𝑏)) ⊆ (𝐹‘𝑐)))
73	72	rexima 7241	. . . . . . . 8 ⊢ ((𝐹 Fn 𝒫 𝐴 ∧ 𝐵 ⊆ 𝒫 𝐴) → (∃𝑧 ∈ (𝐹 “ 𝐵)((𝐹‘𝑎) ∪ (𝐹‘𝑏)) ⊆ 𝑧 ↔ ∃𝑐 ∈ 𝐵 ((𝐹‘𝑎) ∪ (𝐹‘𝑏)) ⊆ (𝐹‘𝑐)))
74	7, 8, 73	syl2anc 583	. . . . . . 7 ⊢ (𝜑 → (∃𝑧 ∈ (𝐹 “ 𝐵)((𝐹‘𝑎) ∪ (𝐹‘𝑏)) ⊆ 𝑧 ↔ ∃𝑐 ∈ 𝐵 ((𝐹‘𝑎) ∪ (𝐹‘𝑏)) ⊆ (𝐹‘𝑐)))
75	74	ralbidv 3176	. . . . . 6 ⊢ (𝜑 → (∀𝑏 ∈ 𝐵 ∃𝑧 ∈ (𝐹 “ 𝐵)((𝐹‘𝑎) ∪ (𝐹‘𝑏)) ⊆ 𝑧 ↔ ∀𝑏 ∈ 𝐵 ∃𝑐 ∈ 𝐵 ((𝐹‘𝑎) ∪ (𝐹‘𝑏)) ⊆ (𝐹‘𝑐)))
76	71, 75	bitrd 279	. . . . 5 ⊢ (𝜑 → (∀𝑦 ∈ (𝐹 “ 𝐵)∃𝑧 ∈ (𝐹 “ 𝐵)((𝐹‘𝑎) ∪ 𝑦) ⊆ 𝑧 ↔ ∀𝑏 ∈ 𝐵 ∃𝑐 ∈ 𝐵 ((𝐹‘𝑎) ∪ (𝐹‘𝑏)) ⊆ (𝐹‘𝑐)))
77	76	ralbidv 3176	. . . 4 ⊢ (𝜑 → (∀𝑎 ∈ 𝐵 ∀𝑦 ∈ (𝐹 “ 𝐵)∃𝑧 ∈ (𝐹 “ 𝐵)((𝐹‘𝑎) ∪ 𝑦) ⊆ 𝑧 ↔ ∀𝑎 ∈ 𝐵 ∀𝑏 ∈ 𝐵 ∃𝑐 ∈ 𝐵 ((𝐹‘𝑎) ∪ (𝐹‘𝑏)) ⊆ (𝐹‘𝑐)))
78	66, 77	bitrd 279	. . 3 ⊢ (𝜑 → (∀𝑥 ∈ (𝐹 “ 𝐵)∀𝑦 ∈ (𝐹 “ 𝐵)∃𝑧 ∈ (𝐹 “ 𝐵)(𝑥 ∪ 𝑦) ⊆ 𝑧 ↔ ∀𝑎 ∈ 𝐵 ∀𝑏 ∈ 𝐵 ∃𝑐 ∈ 𝐵 ((𝐹‘𝑎) ∪ (𝐹‘𝑏)) ⊆ (𝐹‘𝑐)))
79	60, 78	mpbird 257	. 2 ⊢ (𝜑 → ∀𝑥 ∈ (𝐹 “ 𝐵)∀𝑦 ∈ (𝐹 “ 𝐵)∃𝑧 ∈ (𝐹 “ 𝐵)(𝑥 ∪ 𝑦) ⊆ 𝑧)
80		isipodrs 18495	. 2 ⊢ ((toInc‘(𝐹 “ 𝐵)) ∈ Dirset ↔ ((𝐹 “ 𝐵) ∈ V ∧ (𝐹 “ 𝐵) ≠ ∅ ∧ ∀𝑥 ∈ (𝐹 “ 𝐵)∀𝑦 ∈ (𝐹 “ 𝐵)∃𝑧 ∈ (𝐹 “ 𝐵)(𝑥 ∪ 𝑦) ⊆ 𝑧))
81	2, 12, 79, 80	syl3anbrc 1342	1 ⊢ (𝜑 → (toInc‘(𝐹 “ 𝐵)) ∈ Dirset)

Colors of variables: wff setvar class

Syntax hints: → wi 4 ↔ wb 205 ∧ wa 395 ∧ w3a 1086 = wceq 1540 ∈ wcel 2105 ≠ wne 2939 ∀wral 3060 ∃wrex 3069 Vcvv 3473 ∪ cun 3946 ⊆ wss 3948 ∅c0 4322 𝒫 cpw 4602 “ cima 5679 Fn wfn 6538 ‘cfv 6543 Dirsetcdrs 18252 toInccipo 18485

This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1796 ax-4 1810 ax-5 1912 ax-6 1970 ax-7 2010 ax-8 2107 ax-9 2115 ax-10 2136 ax-11 2153 ax-12 2170 ax-ext 2702 ax-sep 5299 ax-nul 5306 ax-pow 5363 ax-pr 5427 ax-un 7729 ax-cnex 11170 ax-resscn 11171 ax-1cn 11172 ax-icn 11173 ax-addcl 11174 ax-addrcl 11175 ax-mulcl 11176 ax-mulrcl 11177 ax-mulcom 11178 ax-addass 11179 ax-mulass 11180 ax-distr 11181 ax-i2m1 11182 ax-1ne0 11183 ax-1rid 11184 ax-rnegex 11185 ax-rrecex 11186 ax-cnre 11187 ax-pre-lttri 11188 ax-pre-lttrn 11189 ax-pre-ltadd 11190 ax-pre-mulgt0 11191

This theorem depends on definitions: df-bi 206 df-an 396 df-or 845 df-3or 1087 df-3an 1088 df-tru 1543 df-fal 1553 df-ex 1781 df-nf 1785 df-sb 2067 df-mo 2533 df-eu 2562 df-clab 2709 df-cleq 2723 df-clel 2809 df-nfc 2884 df-ne 2940 df-nel 3046 df-ral 3061 df-rex 3070 df-reu 3376 df-rab 3432 df-v 3475 df-sbc 3778 df-csb 3894 df-dif 3951 df-un 3953 df-in 3955 df-ss 3965 df-pss 3967 df-nul 4323 df-if 4529 df-pw 4604 df-sn 4629 df-pr 4631 df-op 4635 df-uni 4909 df-iun 4999 df-br 5149 df-opab 5211 df-mpt 5232 df-tr 5266 df-id 5574 df-eprel 5580 df-po 5588 df-so 5589 df-fr 5631 df-we 5633 df-xp 5682 df-rel 5683 df-cnv 5684 df-co 5685 df-dm 5686 df-rn 5687 df-res 5688 df-ima 5689 df-pred 6300 df-ord 6367 df-on 6368 df-lim 6369 df-suc 6370 df-iota 6495 df-fun 6545 df-fn 6546 df-f 6547 df-f1 6548 df-fo 6549 df-f1o 6550 df-fv 6551 df-riota 7368 df-ov 7415 df-oprab 7416 df-mpo 7417 df-om 7860 df-1st 7979 df-2nd 7980 df-frecs 8270 df-wrecs 8301 df-recs 8375 df-rdg 8414 df-1o 8470 df-er 8707 df-en 8944 df-dom 8945 df-sdom 8946 df-fin 8947 df-pnf 11255 df-mnf 11256 df-xr 11257 df-ltxr 11258 df-le 11259 df-sub 11451 df-neg 11452 df-nn 12218 df-2 12280 df-3 12281 df-4 12282 df-5 12283 df-6 12284 df-7 12285 df-8 12286 df-9 12287 df-n0 12478 df-z 12564 df-dec 12683 df-uz 12828 df-fz 13490 df-struct 17085 df-slot 17120 df-ndx 17132 df-base 17150 df-tset 17221 df-ple 17222 df-ocomp 17223 df-proset 18253 df-drs 18254 df-poset 18271 df-ipo 18486

This theorem is referenced by: isacs4lem 18502 isnacs3 41751

W3C validator