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Theorem ipodrsima 18498

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 3493	. 2 ⊢ (𝜑 → (𝐹 “ 𝐵) ∈ V)
3		ipodrsima.d	. . . . 5 ⊢ (𝜑 → (toInc‘𝐵) ∈ Dirset)
4		isipodrs 18494	. . . . 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 1141	. . 3 ⊢ (𝜑 → 𝐵 ≠ ∅)
7		ipodrsima.f	. . . . 5 ⊢ (𝜑 → 𝐹 Fn 𝒫 𝐴)
8		ipodrsima.s	. . . . 5 ⊢ (𝜑 → 𝐵 ⊆ 𝒫 𝐴)
9		fnimaeq0 6682	. . . . 5 ⊢ ((𝐹 Fn 𝒫 𝐴 ∧ 𝐵 ⊆ 𝒫 𝐴) → ((𝐹 “ 𝐵) = ∅ ↔ 𝐵 = ∅))
10	7, 8, 9	syl2anc 582	. . . 4 ⊢ (𝜑 → ((𝐹 “ 𝐵) = ∅ ↔ 𝐵 = ∅))
11	10	necon3bid 2983	. . 3 ⊢ (𝜑 → ((𝐹 “ 𝐵) ≠ ∅ ↔ 𝐵 ≠ ∅))
12	6, 11	mpbird 256	. 2 ⊢ (𝜑 → (𝐹 “ 𝐵) ≠ ∅)
13	5	simp3d 1142	. . . 4 ⊢ (𝜑 → ∀𝑎 ∈ 𝐵 ∀𝑏 ∈ 𝐵 ∃𝑐 ∈ 𝐵 (𝑎 ∪ 𝑏) ⊆ 𝑐)
14		simplll 771	. . . . . . . . . . . 12 ⊢ ((((𝜑 ∧ 𝑎 ∈ 𝐵) ∧ (𝑏 ∈ 𝐵 ∧ 𝑐 ∈ 𝐵)) ∧ 𝑎 ⊆ 𝑐) → 𝜑)
15		simpr 483	. . . . . . . . . . . 12 ⊢ ((((𝜑 ∧ 𝑎 ∈ 𝐵) ∧ (𝑏 ∈ 𝐵 ∧ 𝑐 ∈ 𝐵)) ∧ 𝑎 ⊆ 𝑐) → 𝑎 ⊆ 𝑐)
16	8	ad2antrr 722	. . . . . . . . . . . . . . 15 ⊢ (((𝜑 ∧ 𝑎 ∈ 𝐵) ∧ (𝑏 ∈ 𝐵 ∧ 𝑐 ∈ 𝐵)) → 𝐵 ⊆ 𝒫 𝐴)
17		simprr 769	. . . . . . . . . . . . . . 15 ⊢ (((𝜑 ∧ 𝑎 ∈ 𝐵) ∧ (𝑏 ∈ 𝐵 ∧ 𝑐 ∈ 𝐵)) → 𝑐 ∈ 𝐵)
18	16, 17	sseldd 3982	. . . . . . . . . . . . . 14 ⊢ (((𝜑 ∧ 𝑎 ∈ 𝐵) ∧ (𝑏 ∈ 𝐵 ∧ 𝑐 ∈ 𝐵)) → 𝑐 ∈ 𝒫 𝐴)
19	18	elpwid 4610	. . . . . . . . . . . . 13 ⊢ (((𝜑 ∧ 𝑎 ∈ 𝐵) ∧ (𝑏 ∈ 𝐵 ∧ 𝑐 ∈ 𝐵)) → 𝑐 ⊆ 𝐴)
20	19	adantr 479	. . . . . . . . . . . 12 ⊢ ((((𝜑 ∧ 𝑎 ∈ 𝐵) ∧ (𝑏 ∈ 𝐵 ∧ 𝑐 ∈ 𝐵)) ∧ 𝑎 ⊆ 𝑐) → 𝑐 ⊆ 𝐴)
21		vex 3476	. . . . . . . . . . . . 13 ⊢ 𝑎 ∈ V
22		vex 3476	. . . . . . . . . . . . 13 ⊢ 𝑐 ∈ V
23		sseq12 4008	. . . . . . . . . . . . . . . 16 ⊢ ((𝑢 = 𝑎 ∧ 𝑣 = 𝑐) → (𝑢 ⊆ 𝑣 ↔ 𝑎 ⊆ 𝑐))
24		sseq1 4006	. . . . . . . . . . . . . . . . 17 ⊢ (𝑣 = 𝑐 → (𝑣 ⊆ 𝐴 ↔ 𝑐 ⊆ 𝐴))
25	24	adantl 480	. . . . . . . . . . . . . . . 16 ⊢ ((𝑢 = 𝑎 ∧ 𝑣 = 𝑐) → (𝑣 ⊆ 𝐴 ↔ 𝑐 ⊆ 𝐴))
26	23, 25	anbi12d 629	. . . . . . . . . . . . . . 15 ⊢ ((𝑢 = 𝑎 ∧ 𝑣 = 𝑐) → ((𝑢 ⊆ 𝑣 ∧ 𝑣 ⊆ 𝐴) ↔ (𝑎 ⊆ 𝑐 ∧ 𝑐 ⊆ 𝐴)))
27	26	anbi2d 627	. . . . . . . . . . . . . 14 ⊢ ((𝑢 = 𝑎 ∧ 𝑣 = 𝑐) → ((𝜑 ∧ (𝑢 ⊆ 𝑣 ∧ 𝑣 ⊆ 𝐴)) ↔ (𝜑 ∧ (𝑎 ⊆ 𝑐 ∧ 𝑐 ⊆ 𝐴))))
28		fveq2 6890	. . . . . . . . . . . . . . 15 ⊢ (𝑢 = 𝑎 → (𝐹‘𝑢) = (𝐹‘𝑎))
29		fveq2 6890	. . . . . . . . . . . . . . 15 ⊢ (𝑣 = 𝑐 → (𝐹‘𝑣) = (𝐹‘𝑐))
30		sseq12 4008	. . . . . . . . . . . . . . 15 ⊢ (((𝐹‘𝑢) = (𝐹‘𝑎) ∧ (𝐹‘𝑣) = (𝐹‘𝑐)) → ((𝐹‘𝑢) ⊆ (𝐹‘𝑣) ↔ (𝐹‘𝑎) ⊆ (𝐹‘𝑐)))
31	28, 29, 30	syl2an 594	. . . . . . . . . . . . . 14 ⊢ ((𝑢 = 𝑎 ∧ 𝑣 = 𝑐) → ((𝐹‘𝑢) ⊆ (𝐹‘𝑣) ↔ (𝐹‘𝑎) ⊆ (𝐹‘𝑐)))
32	27, 31	imbi12d 343	. . . . . . . . . . . . 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 3553	. . . . . . . . . . . 12 ⊢ ((𝜑 ∧ (𝑎 ⊆ 𝑐 ∧ 𝑐 ⊆ 𝐴)) → (𝐹‘𝑎) ⊆ (𝐹‘𝑐))
35	14, 15, 20, 34	syl12anc 833	. . . . . . . . . . 11 ⊢ ((((𝜑 ∧ 𝑎 ∈ 𝐵) ∧ (𝑏 ∈ 𝐵 ∧ 𝑐 ∈ 𝐵)) ∧ 𝑎 ⊆ 𝑐) → (𝐹‘𝑎) ⊆ (𝐹‘𝑐))
36	35	ex 411	. . . . . . . . . 10 ⊢ (((𝜑 ∧ 𝑎 ∈ 𝐵) ∧ (𝑏 ∈ 𝐵 ∧ 𝑐 ∈ 𝐵)) → (𝑎 ⊆ 𝑐 → (𝐹‘𝑎) ⊆ (𝐹‘𝑐)))
37		simplll 771	. . . . . . . . . . . 12 ⊢ ((((𝜑 ∧ 𝑎 ∈ 𝐵) ∧ (𝑏 ∈ 𝐵 ∧ 𝑐 ∈ 𝐵)) ∧ 𝑏 ⊆ 𝑐) → 𝜑)
38		simpr 483	. . . . . . . . . . . 12 ⊢ ((((𝜑 ∧ 𝑎 ∈ 𝐵) ∧ (𝑏 ∈ 𝐵 ∧ 𝑐 ∈ 𝐵)) ∧ 𝑏 ⊆ 𝑐) → 𝑏 ⊆ 𝑐)
39	19	adantr 479	. . . . . . . . . . . 12 ⊢ ((((𝜑 ∧ 𝑎 ∈ 𝐵) ∧ (𝑏 ∈ 𝐵 ∧ 𝑐 ∈ 𝐵)) ∧ 𝑏 ⊆ 𝑐) → 𝑐 ⊆ 𝐴)
40		vex 3476	. . . . . . . . . . . . 13 ⊢ 𝑏 ∈ V
41		sseq12 4008	. . . . . . . . . . . . . . . 16 ⊢ ((𝑢 = 𝑏 ∧ 𝑣 = 𝑐) → (𝑢 ⊆ 𝑣 ↔ 𝑏 ⊆ 𝑐))
42	24	adantl 480	. . . . . . . . . . . . . . . 16 ⊢ ((𝑢 = 𝑏 ∧ 𝑣 = 𝑐) → (𝑣 ⊆ 𝐴 ↔ 𝑐 ⊆ 𝐴))
43	41, 42	anbi12d 629	. . . . . . . . . . . . . . 15 ⊢ ((𝑢 = 𝑏 ∧ 𝑣 = 𝑐) → ((𝑢 ⊆ 𝑣 ∧ 𝑣 ⊆ 𝐴) ↔ (𝑏 ⊆ 𝑐 ∧ 𝑐 ⊆ 𝐴)))
44	43	anbi2d 627	. . . . . . . . . . . . . 14 ⊢ ((𝑢 = 𝑏 ∧ 𝑣 = 𝑐) → ((𝜑 ∧ (𝑢 ⊆ 𝑣 ∧ 𝑣 ⊆ 𝐴)) ↔ (𝜑 ∧ (𝑏 ⊆ 𝑐 ∧ 𝑐 ⊆ 𝐴))))
45		fveq2 6890	. . . . . . . . . . . . . . 15 ⊢ (𝑢 = 𝑏 → (𝐹‘𝑢) = (𝐹‘𝑏))
46		sseq12 4008	. . . . . . . . . . . . . . 15 ⊢ (((𝐹‘𝑢) = (𝐹‘𝑏) ∧ (𝐹‘𝑣) = (𝐹‘𝑐)) → ((𝐹‘𝑢) ⊆ (𝐹‘𝑣) ↔ (𝐹‘𝑏) ⊆ (𝐹‘𝑐)))
47	45, 29, 46	syl2an 594	. . . . . . . . . . . . . 14 ⊢ ((𝑢 = 𝑏 ∧ 𝑣 = 𝑐) → ((𝐹‘𝑢) ⊆ (𝐹‘𝑣) ↔ (𝐹‘𝑏) ⊆ (𝐹‘𝑐)))
48	44, 47	imbi12d 343	. . . . . . . . . . . . 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 3553	. . . . . . . . . . . 12 ⊢ ((𝜑 ∧ (𝑏 ⊆ 𝑐 ∧ 𝑐 ⊆ 𝐴)) → (𝐹‘𝑏) ⊆ (𝐹‘𝑐))
50	37, 38, 39, 49	syl12anc 833	. . . . . . . . . . 11 ⊢ ((((𝜑 ∧ 𝑎 ∈ 𝐵) ∧ (𝑏 ∈ 𝐵 ∧ 𝑐 ∈ 𝐵)) ∧ 𝑏 ⊆ 𝑐) → (𝐹‘𝑏) ⊆ (𝐹‘𝑐))
51	50	ex 411	. . . . . . . . . 10 ⊢ (((𝜑 ∧ 𝑎 ∈ 𝐵) ∧ (𝑏 ∈ 𝐵 ∧ 𝑐 ∈ 𝐵)) → (𝑏 ⊆ 𝑐 → (𝐹‘𝑏) ⊆ (𝐹‘𝑐)))
52	36, 51	anim12d 607	. . . . . . . . 9 ⊢ (((𝜑 ∧ 𝑎 ∈ 𝐵) ∧ (𝑏 ∈ 𝐵 ∧ 𝑐 ∈ 𝐵)) → ((𝑎 ⊆ 𝑐 ∧ 𝑏 ⊆ 𝑐) → ((𝐹‘𝑎) ⊆ (𝐹‘𝑐) ∧ (𝐹‘𝑏) ⊆ (𝐹‘𝑐))))
53		unss 4183	. . . . . . . . 9 ⊢ ((𝑎 ⊆ 𝑐 ∧ 𝑏 ⊆ 𝑐) ↔ (𝑎 ∪ 𝑏) ⊆ 𝑐)
54		unss 4183	. . . . . . . . 9 ⊢ (((𝐹‘𝑎) ⊆ (𝐹‘𝑐) ∧ (𝐹‘𝑏) ⊆ (𝐹‘𝑐)) ↔ ((𝐹‘𝑎) ∪ (𝐹‘𝑏)) ⊆ (𝐹‘𝑐))
55	52, 53, 54	3imtr3g 294	. . . . . . . 8 ⊢ (((𝜑 ∧ 𝑎 ∈ 𝐵) ∧ (𝑏 ∈ 𝐵 ∧ 𝑐 ∈ 𝐵)) → ((𝑎 ∪ 𝑏) ⊆ 𝑐 → ((𝐹‘𝑎) ∪ (𝐹‘𝑏)) ⊆ (𝐹‘𝑐)))
56	55	anassrs 466	. . . . . . 7 ⊢ ((((𝜑 ∧ 𝑎 ∈ 𝐵) ∧ 𝑏 ∈ 𝐵) ∧ 𝑐 ∈ 𝐵) → ((𝑎 ∪ 𝑏) ⊆ 𝑐 → ((𝐹‘𝑎) ∪ (𝐹‘𝑏)) ⊆ (𝐹‘𝑐)))
57	56	reximdva 3166	. . . . . 6 ⊢ (((𝜑 ∧ 𝑎 ∈ 𝐵) ∧ 𝑏 ∈ 𝐵) → (∃𝑐 ∈ 𝐵 (𝑎 ∪ 𝑏) ⊆ 𝑐 → ∃𝑐 ∈ 𝐵 ((𝐹‘𝑎) ∪ (𝐹‘𝑏)) ⊆ (𝐹‘𝑐)))
58	57	ralimdva 3165	. . . . 5 ⊢ ((𝜑 ∧ 𝑎 ∈ 𝐵) → (∀𝑏 ∈ 𝐵 ∃𝑐 ∈ 𝐵 (𝑎 ∪ 𝑏) ⊆ 𝑐 → ∀𝑏 ∈ 𝐵 ∃𝑐 ∈ 𝐵 ((𝐹‘𝑎) ∪ (𝐹‘𝑏)) ⊆ (𝐹‘𝑐)))
59	58	ralimdva 3165	. . . 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 4155	. . . . . . . . 9 ⊢ (𝑥 = (𝐹‘𝑎) → (𝑥 ∪ 𝑦) = ((𝐹‘𝑎) ∪ 𝑦))
62	61	sseq1d 4012	. . . . . . . 8 ⊢ (𝑥 = (𝐹‘𝑎) → ((𝑥 ∪ 𝑦) ⊆ 𝑧 ↔ ((𝐹‘𝑎) ∪ 𝑦) ⊆ 𝑧))
63	62	rexbidv 3176	. . . . . . 7 ⊢ (𝑥 = (𝐹‘𝑎) → (∃𝑧 ∈ (𝐹 “ 𝐵)(𝑥 ∪ 𝑦) ⊆ 𝑧 ↔ ∃𝑧 ∈ (𝐹 “ 𝐵)((𝐹‘𝑎) ∪ 𝑦) ⊆ 𝑧))
64	63	ralbidv 3175	. . . . . 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 7241	. . . . 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 582	. . . 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 4156	. . . . . . . . . 10 ⊢ (𝑦 = (𝐹‘𝑏) → ((𝐹‘𝑎) ∪ 𝑦) = ((𝐹‘𝑎) ∪ (𝐹‘𝑏)))
68	67	sseq1d 4012	. . . . . . . . 9 ⊢ (𝑦 = (𝐹‘𝑏) → (((𝐹‘𝑎) ∪ 𝑦) ⊆ 𝑧 ↔ ((𝐹‘𝑎) ∪ (𝐹‘𝑏)) ⊆ 𝑧))
69	68	rexbidv 3176	. . . . . . . 8 ⊢ (𝑦 = (𝐹‘𝑏) → (∃𝑧 ∈ (𝐹 “ 𝐵)((𝐹‘𝑎) ∪ 𝑦) ⊆ 𝑧 ↔ ∃𝑧 ∈ (𝐹 “ 𝐵)((𝐹‘𝑎) ∪ (𝐹‘𝑏)) ⊆ 𝑧))
70	69	ralima 7241	. . . . . . 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 582	. . . . . 6 ⊢ (𝜑 → (∀𝑦 ∈ (𝐹 “ 𝐵)∃𝑧 ∈ (𝐹 “ 𝐵)((𝐹‘𝑎) ∪ 𝑦) ⊆ 𝑧 ↔ ∀𝑏 ∈ 𝐵 ∃𝑧 ∈ (𝐹 “ 𝐵)((𝐹‘𝑎) ∪ (𝐹‘𝑏)) ⊆ 𝑧))
72		sseq2 4007	. . . . . . . . 9 ⊢ (𝑧 = (𝐹‘𝑐) → (((𝐹‘𝑎) ∪ (𝐹‘𝑏)) ⊆ 𝑧 ↔ ((𝐹‘𝑎) ∪ (𝐹‘𝑏)) ⊆ (𝐹‘𝑐)))
73	72	rexima 7240	. . . . . . . 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 582	. . . . . . 7 ⊢ (𝜑 → (∃𝑧 ∈ (𝐹 “ 𝐵)((𝐹‘𝑎) ∪ (𝐹‘𝑏)) ⊆ 𝑧 ↔ ∃𝑐 ∈ 𝐵 ((𝐹‘𝑎) ∪ (𝐹‘𝑏)) ⊆ (𝐹‘𝑐)))
75	74	ralbidv 3175	. . . . . 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 278	. . . . 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 3175	. . . 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 278	. . 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 256	. 2 ⊢ (𝜑 → ∀𝑥 ∈ (𝐹 “ 𝐵)∀𝑦 ∈ (𝐹 “ 𝐵)∃𝑧 ∈ (𝐹 “ 𝐵)(𝑥 ∪ 𝑦) ⊆ 𝑧)
80		isipodrs 18494	. 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 1341	1 ⊢ (𝜑 → (toInc‘(𝐹 “ 𝐵)) ∈ Dirset)

Colors of variables: wff setvar class

Syntax hints: → wi 4 ↔ wb 205 ∧ wa 394 ∧ w3a 1085 = wceq 1539 ∈ wcel 2104 ≠ wne 2938 ∀wral 3059 ∃wrex 3068 Vcvv 3472 ∪ cun 3945 ⊆ wss 3947 ∅c0 4321 𝒫 cpw 4601 “ cima 5678 Fn wfn 6537 ‘cfv 6542 Dirsetcdrs 18251 toInccipo 18484

This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1795 ax-4 1809 ax-5 1911 ax-6 1969 ax-7 2009 ax-8 2106 ax-9 2114 ax-10 2135 ax-11 2152 ax-12 2169 ax-ext 2701 ax-sep 5298 ax-nul 5305 ax-pow 5362 ax-pr 5426 ax-un 7727 ax-cnex 11168 ax-resscn 11169 ax-1cn 11170 ax-icn 11171 ax-addcl 11172 ax-addrcl 11173 ax-mulcl 11174 ax-mulrcl 11175 ax-mulcom 11176 ax-addass 11177 ax-mulass 11178 ax-distr 11179 ax-i2m1 11180 ax-1ne0 11181 ax-1rid 11182 ax-rnegex 11183 ax-rrecex 11184 ax-cnre 11185 ax-pre-lttri 11186 ax-pre-lttrn 11187 ax-pre-ltadd 11188 ax-pre-mulgt0 11189

This theorem depends on definitions: df-bi 206 df-an 395 df-or 844 df-3or 1086 df-3an 1087 df-tru 1542 df-fal 1552 df-ex 1780 df-nf 1784 df-sb 2066 df-mo 2532 df-eu 2561 df-clab 2708 df-cleq 2722 df-clel 2808 df-nfc 2883 df-ne 2939 df-nel 3045 df-ral 3060 df-rex 3069 df-reu 3375 df-rab 3431 df-v 3474 df-sbc 3777 df-csb 3893 df-dif 3950 df-un 3952 df-in 3954 df-ss 3964 df-pss 3966 df-nul 4322 df-if 4528 df-pw 4603 df-sn 4628 df-pr 4630 df-op 4634 df-uni 4908 df-iun 4998 df-br 5148 df-opab 5210 df-mpt 5231 df-tr 5265 df-id 5573 df-eprel 5579 df-po 5587 df-so 5588 df-fr 5630 df-we 5632 df-xp 5681 df-rel 5682 df-cnv 5683 df-co 5684 df-dm 5685 df-rn 5686 df-res 5687 df-ima 5688 df-pred 6299 df-ord 6366 df-on 6367 df-lim 6368 df-suc 6369 df-iota 6494 df-fun 6544 df-fn 6545 df-f 6546 df-f1 6547 df-fo 6548 df-f1o 6549 df-fv 6550 df-riota 7367 df-ov 7414 df-oprab 7415 df-mpo 7416 df-om 7858 df-1st 7977 df-2nd 7978 df-frecs 8268 df-wrecs 8299 df-recs 8373 df-rdg 8412 df-1o 8468 df-er 8705 df-en 8942 df-dom 8943 df-sdom 8944 df-fin 8945 df-pnf 11254 df-mnf 11255 df-xr 11256 df-ltxr 11257 df-le 11258 df-sub 11450 df-neg 11451 df-nn 12217 df-2 12279 df-3 12280 df-4 12281 df-5 12282 df-6 12283 df-7 12284 df-8 12285 df-9 12286 df-n0 12477 df-z 12563 df-dec 12682 df-uz 12827 df-fz 13489 df-struct 17084 df-slot 17119 df-ndx 17131 df-base 17149 df-tset 17220 df-ple 17221 df-ocomp 17222 df-proset 18252 df-drs 18253 df-poset 18270 df-ipo 18485

This theorem is referenced by: isacs4lem 18501 isnacs3 41750

W3C validator