isipodrs - Metamath Proof Explorer

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Theorem isipodrs 18492

Description: Condition for a family of sets to be directed by inclusion. (Contributed by Stefan O'Rear, 2-Apr-2015.)

**Assertion**
Ref	Expression
isipodrs	⊢ ((toInc‘𝐴) ∈ Dirset ↔ (𝐴 ∈ V ∧ 𝐴 ≠ ∅ ∧ ∀𝑥 ∈ 𝐴 ∀𝑦 ∈ 𝐴 ∃𝑧 ∈ 𝐴 (𝑥 ∪ 𝑦) ⊆ 𝑧))

Distinct variable group: 𝑧,𝐴,𝑥,𝑦

**Proof of Theorem isipodrs**
Step	Hyp	Ref	Expression
1		eqid 2732	. . . . 5 ⊢ (Base‘(toInc‘𝐴)) = (Base‘(toInc‘𝐴))
2	1	drsbn0 18259	. . . 4 ⊢ ((toInc‘𝐴) ∈ Dirset → (Base‘(toInc‘𝐴)) ≠ ∅)
3	2	neneqd 2945	. . 3 ⊢ ((toInc‘𝐴) ∈ Dirset → ¬ (Base‘(toInc‘𝐴)) = ∅)
4		fvprc 6883	. . . . 5 ⊢ (¬ 𝐴 ∈ V → (toInc‘𝐴) = ∅)
5	4	fveq2d 6895	. . . 4 ⊢ (¬ 𝐴 ∈ V → (Base‘(toInc‘𝐴)) = (Base‘∅))
6		base0 17151	. . . 4 ⊢ ∅ = (Base‘∅)
7	5, 6	eqtr4di 2790	. . 3 ⊢ (¬ 𝐴 ∈ V → (Base‘(toInc‘𝐴)) = ∅)
8	3, 7	nsyl2 141	. 2 ⊢ ((toInc‘𝐴) ∈ Dirset → 𝐴 ∈ V)
9		simp1 1136	. 2 ⊢ ((𝐴 ∈ V ∧ 𝐴 ≠ ∅ ∧ ∀𝑥 ∈ 𝐴 ∀𝑦 ∈ 𝐴 ∃𝑧 ∈ 𝐴 (𝑥 ∪ 𝑦) ⊆ 𝑧) → 𝐴 ∈ V)
10		eqid 2732	. . . 4 ⊢ (le‘(toInc‘𝐴)) = (le‘(toInc‘𝐴))
11	1, 10	isdrs 18256	. . 3 ⊢ ((toInc‘𝐴) ∈ Dirset ↔ ((toInc‘𝐴) ∈ Proset ∧ (Base‘(toInc‘𝐴)) ≠ ∅ ∧ ∀𝑥 ∈ (Base‘(toInc‘𝐴))∀𝑦 ∈ (Base‘(toInc‘𝐴))∃𝑧 ∈ (Base‘(toInc‘𝐴))(𝑥(le‘(toInc‘𝐴))𝑧 ∧ 𝑦(le‘(toInc‘𝐴))𝑧)))
12		eqid 2732	. . . . . . . 8 ⊢ (toInc‘𝐴) = (toInc‘𝐴)
13	12	ipopos 18491	. . . . . . 7 ⊢ (toInc‘𝐴) ∈ Poset
14		posprs 18271	. . . . . . 7 ⊢ ((toInc‘𝐴) ∈ Poset → (toInc‘𝐴) ∈ Proset )
15	13, 14	mp1i 13	. . . . . 6 ⊢ (𝐴 ∈ V → (toInc‘𝐴) ∈ Proset )
16		id 22	. . . . . 6 ⊢ (𝐴 ∈ V → 𝐴 ∈ V)
17	15, 16	2thd 264	. . . . 5 ⊢ (𝐴 ∈ V → ((toInc‘𝐴) ∈ Proset ↔ 𝐴 ∈ V))
18	12	ipobas 18486	. . . . . . 7 ⊢ (𝐴 ∈ V → 𝐴 = (Base‘(toInc‘𝐴)))
19		neeq1 3003	. . . . . . . 8 ⊢ (𝐴 = (Base‘(toInc‘𝐴)) → (𝐴 ≠ ∅ ↔ (Base‘(toInc‘𝐴)) ≠ ∅))
20		rexeq 3321	. . . . . . . . . 10 ⊢ (𝐴 = (Base‘(toInc‘𝐴)) → (∃𝑧 ∈ 𝐴 (𝑥(le‘(toInc‘𝐴))𝑧 ∧ 𝑦(le‘(toInc‘𝐴))𝑧) ↔ ∃𝑧 ∈ (Base‘(toInc‘𝐴))(𝑥(le‘(toInc‘𝐴))𝑧 ∧ 𝑦(le‘(toInc‘𝐴))𝑧)))
21	20	raleqbi1dv 3333	. . . . . . . . 9 ⊢ (𝐴 = (Base‘(toInc‘𝐴)) → (∀𝑦 ∈ 𝐴 ∃𝑧 ∈ 𝐴 (𝑥(le‘(toInc‘𝐴))𝑧 ∧ 𝑦(le‘(toInc‘𝐴))𝑧) ↔ ∀𝑦 ∈ (Base‘(toInc‘𝐴))∃𝑧 ∈ (Base‘(toInc‘𝐴))(𝑥(le‘(toInc‘𝐴))𝑧 ∧ 𝑦(le‘(toInc‘𝐴))𝑧)))
22	21	raleqbi1dv 3333	. . . . . . . 8 ⊢ (𝐴 = (Base‘(toInc‘𝐴)) → (∀𝑥 ∈ 𝐴 ∀𝑦 ∈ 𝐴 ∃𝑧 ∈ 𝐴 (𝑥(le‘(toInc‘𝐴))𝑧 ∧ 𝑦(le‘(toInc‘𝐴))𝑧) ↔ ∀𝑥 ∈ (Base‘(toInc‘𝐴))∀𝑦 ∈ (Base‘(toInc‘𝐴))∃𝑧 ∈ (Base‘(toInc‘𝐴))(𝑥(le‘(toInc‘𝐴))𝑧 ∧ 𝑦(le‘(toInc‘𝐴))𝑧)))
23	19, 22	anbi12d 631	. . . . . . 7 ⊢ (𝐴 = (Base‘(toInc‘𝐴)) → ((𝐴 ≠ ∅ ∧ ∀𝑥 ∈ 𝐴 ∀𝑦 ∈ 𝐴 ∃𝑧 ∈ 𝐴 (𝑥(le‘(toInc‘𝐴))𝑧 ∧ 𝑦(le‘(toInc‘𝐴))𝑧)) ↔ ((Base‘(toInc‘𝐴)) ≠ ∅ ∧ ∀𝑥 ∈ (Base‘(toInc‘𝐴))∀𝑦 ∈ (Base‘(toInc‘𝐴))∃𝑧 ∈ (Base‘(toInc‘𝐴))(𝑥(le‘(toInc‘𝐴))𝑧 ∧ 𝑦(le‘(toInc‘𝐴))𝑧))))
24	18, 23	syl 17	. . . . . 6 ⊢ (𝐴 ∈ V → ((𝐴 ≠ ∅ ∧ ∀𝑥 ∈ 𝐴 ∀𝑦 ∈ 𝐴 ∃𝑧 ∈ 𝐴 (𝑥(le‘(toInc‘𝐴))𝑧 ∧ 𝑦(le‘(toInc‘𝐴))𝑧)) ↔ ((Base‘(toInc‘𝐴)) ≠ ∅ ∧ ∀𝑥 ∈ (Base‘(toInc‘𝐴))∀𝑦 ∈ (Base‘(toInc‘𝐴))∃𝑧 ∈ (Base‘(toInc‘𝐴))(𝑥(le‘(toInc‘𝐴))𝑧 ∧ 𝑦(le‘(toInc‘𝐴))𝑧))))
25		simpll 765	. . . . . . . . . . . 12 ⊢ (((𝐴 ∈ V ∧ (𝑥 ∈ 𝐴 ∧ 𝑦 ∈ 𝐴)) ∧ 𝑧 ∈ 𝐴) → 𝐴 ∈ V)
26		simplrl 775	. . . . . . . . . . . 12 ⊢ (((𝐴 ∈ V ∧ (𝑥 ∈ 𝐴 ∧ 𝑦 ∈ 𝐴)) ∧ 𝑧 ∈ 𝐴) → 𝑥 ∈ 𝐴)
27		simpr 485	. . . . . . . . . . . 12 ⊢ (((𝐴 ∈ V ∧ (𝑥 ∈ 𝐴 ∧ 𝑦 ∈ 𝐴)) ∧ 𝑧 ∈ 𝐴) → 𝑧 ∈ 𝐴)
28	12, 10	ipole 18489	. . . . . . . . . . . 12 ⊢ ((𝐴 ∈ V ∧ 𝑥 ∈ 𝐴 ∧ 𝑧 ∈ 𝐴) → (𝑥(le‘(toInc‘𝐴))𝑧 ↔ 𝑥 ⊆ 𝑧))
29	25, 26, 27, 28	syl3anc 1371	. . . . . . . . . . 11 ⊢ (((𝐴 ∈ V ∧ (𝑥 ∈ 𝐴 ∧ 𝑦 ∈ 𝐴)) ∧ 𝑧 ∈ 𝐴) → (𝑥(le‘(toInc‘𝐴))𝑧 ↔ 𝑥 ⊆ 𝑧))
30		simplrr 776	. . . . . . . . . . . 12 ⊢ (((𝐴 ∈ V ∧ (𝑥 ∈ 𝐴 ∧ 𝑦 ∈ 𝐴)) ∧ 𝑧 ∈ 𝐴) → 𝑦 ∈ 𝐴)
31	12, 10	ipole 18489	. . . . . . . . . . . 12 ⊢ ((𝐴 ∈ V ∧ 𝑦 ∈ 𝐴 ∧ 𝑧 ∈ 𝐴) → (𝑦(le‘(toInc‘𝐴))𝑧 ↔ 𝑦 ⊆ 𝑧))
32	25, 30, 27, 31	syl3anc 1371	. . . . . . . . . . 11 ⊢ (((𝐴 ∈ V ∧ (𝑥 ∈ 𝐴 ∧ 𝑦 ∈ 𝐴)) ∧ 𝑧 ∈ 𝐴) → (𝑦(le‘(toInc‘𝐴))𝑧 ↔ 𝑦 ⊆ 𝑧))
33	29, 32	anbi12d 631	. . . . . . . . . 10 ⊢ (((𝐴 ∈ V ∧ (𝑥 ∈ 𝐴 ∧ 𝑦 ∈ 𝐴)) ∧ 𝑧 ∈ 𝐴) → ((𝑥(le‘(toInc‘𝐴))𝑧 ∧ 𝑦(le‘(toInc‘𝐴))𝑧) ↔ (𝑥 ⊆ 𝑧 ∧ 𝑦 ⊆ 𝑧)))
34		unss 4184	. . . . . . . . . 10 ⊢ ((𝑥 ⊆ 𝑧 ∧ 𝑦 ⊆ 𝑧) ↔ (𝑥 ∪ 𝑦) ⊆ 𝑧)
35	33, 34	bitrdi 286	. . . . . . . . 9 ⊢ (((𝐴 ∈ V ∧ (𝑥 ∈ 𝐴 ∧ 𝑦 ∈ 𝐴)) ∧ 𝑧 ∈ 𝐴) → ((𝑥(le‘(toInc‘𝐴))𝑧 ∧ 𝑦(le‘(toInc‘𝐴))𝑧) ↔ (𝑥 ∪ 𝑦) ⊆ 𝑧))
36	35	rexbidva 3176	. . . . . . . 8 ⊢ ((𝐴 ∈ V ∧ (𝑥 ∈ 𝐴 ∧ 𝑦 ∈ 𝐴)) → (∃𝑧 ∈ 𝐴 (𝑥(le‘(toInc‘𝐴))𝑧 ∧ 𝑦(le‘(toInc‘𝐴))𝑧) ↔ ∃𝑧 ∈ 𝐴 (𝑥 ∪ 𝑦) ⊆ 𝑧))
37	36	2ralbidva 3216	. . . . . . 7 ⊢ (𝐴 ∈ V → (∀𝑥 ∈ 𝐴 ∀𝑦 ∈ 𝐴 ∃𝑧 ∈ 𝐴 (𝑥(le‘(toInc‘𝐴))𝑧 ∧ 𝑦(le‘(toInc‘𝐴))𝑧) ↔ ∀𝑥 ∈ 𝐴 ∀𝑦 ∈ 𝐴 ∃𝑧 ∈ 𝐴 (𝑥 ∪ 𝑦) ⊆ 𝑧))
38	37	anbi2d 629	. . . . . 6 ⊢ (𝐴 ∈ V → ((𝐴 ≠ ∅ ∧ ∀𝑥 ∈ 𝐴 ∀𝑦 ∈ 𝐴 ∃𝑧 ∈ 𝐴 (𝑥(le‘(toInc‘𝐴))𝑧 ∧ 𝑦(le‘(toInc‘𝐴))𝑧)) ↔ (𝐴 ≠ ∅ ∧ ∀𝑥 ∈ 𝐴 ∀𝑦 ∈ 𝐴 ∃𝑧 ∈ 𝐴 (𝑥 ∪ 𝑦) ⊆ 𝑧)))
39	24, 38	bitr3d 280	. . . . 5 ⊢ (𝐴 ∈ V → (((Base‘(toInc‘𝐴)) ≠ ∅ ∧ ∀𝑥 ∈ (Base‘(toInc‘𝐴))∀𝑦 ∈ (Base‘(toInc‘𝐴))∃𝑧 ∈ (Base‘(toInc‘𝐴))(𝑥(le‘(toInc‘𝐴))𝑧 ∧ 𝑦(le‘(toInc‘𝐴))𝑧)) ↔ (𝐴 ≠ ∅ ∧ ∀𝑥 ∈ 𝐴 ∀𝑦 ∈ 𝐴 ∃𝑧 ∈ 𝐴 (𝑥 ∪ 𝑦) ⊆ 𝑧)))
40	17, 39	anbi12d 631	. . . 4 ⊢ (𝐴 ∈ V → (((toInc‘𝐴) ∈ Proset ∧ ((Base‘(toInc‘𝐴)) ≠ ∅ ∧ ∀𝑥 ∈ (Base‘(toInc‘𝐴))∀𝑦 ∈ (Base‘(toInc‘𝐴))∃𝑧 ∈ (Base‘(toInc‘𝐴))(𝑥(le‘(toInc‘𝐴))𝑧 ∧ 𝑦(le‘(toInc‘𝐴))𝑧))) ↔ (𝐴 ∈ V ∧ (𝐴 ≠ ∅ ∧ ∀𝑥 ∈ 𝐴 ∀𝑦 ∈ 𝐴 ∃𝑧 ∈ 𝐴 (𝑥 ∪ 𝑦) ⊆ 𝑧))))
41		3anass 1095	. . . 4 ⊢ (((toInc‘𝐴) ∈ Proset ∧ (Base‘(toInc‘𝐴)) ≠ ∅ ∧ ∀𝑥 ∈ (Base‘(toInc‘𝐴))∀𝑦 ∈ (Base‘(toInc‘𝐴))∃𝑧 ∈ (Base‘(toInc‘𝐴))(𝑥(le‘(toInc‘𝐴))𝑧 ∧ 𝑦(le‘(toInc‘𝐴))𝑧)) ↔ ((toInc‘𝐴) ∈ Proset ∧ ((Base‘(toInc‘𝐴)) ≠ ∅ ∧ ∀𝑥 ∈ (Base‘(toInc‘𝐴))∀𝑦 ∈ (Base‘(toInc‘𝐴))∃𝑧 ∈ (Base‘(toInc‘𝐴))(𝑥(le‘(toInc‘𝐴))𝑧 ∧ 𝑦(le‘(toInc‘𝐴))𝑧))))
42		3anass 1095	. . . 4 ⊢ ((𝐴 ∈ V ∧ 𝐴 ≠ ∅ ∧ ∀𝑥 ∈ 𝐴 ∀𝑦 ∈ 𝐴 ∃𝑧 ∈ 𝐴 (𝑥 ∪ 𝑦) ⊆ 𝑧) ↔ (𝐴 ∈ V ∧ (𝐴 ≠ ∅ ∧ ∀𝑥 ∈ 𝐴 ∀𝑦 ∈ 𝐴 ∃𝑧 ∈ 𝐴 (𝑥 ∪ 𝑦) ⊆ 𝑧)))
43	40, 41, 42	3bitr4g 313	. . 3 ⊢ (𝐴 ∈ V → (((toInc‘𝐴) ∈ Proset ∧ (Base‘(toInc‘𝐴)) ≠ ∅ ∧ ∀𝑥 ∈ (Base‘(toInc‘𝐴))∀𝑦 ∈ (Base‘(toInc‘𝐴))∃𝑧 ∈ (Base‘(toInc‘𝐴))(𝑥(le‘(toInc‘𝐴))𝑧 ∧ 𝑦(le‘(toInc‘𝐴))𝑧)) ↔ (𝐴 ∈ V ∧ 𝐴 ≠ ∅ ∧ ∀𝑥 ∈ 𝐴 ∀𝑦 ∈ 𝐴 ∃𝑧 ∈ 𝐴 (𝑥 ∪ 𝑦) ⊆ 𝑧)))
44	11, 43	bitrid 282	. 2 ⊢ (𝐴 ∈ V → ((toInc‘𝐴) ∈ Dirset ↔ (𝐴 ∈ V ∧ 𝐴 ≠ ∅ ∧ ∀𝑥 ∈ 𝐴 ∀𝑦 ∈ 𝐴 ∃𝑧 ∈ 𝐴 (𝑥 ∪ 𝑦) ⊆ 𝑧)))
45	8, 9, 44	pm5.21nii 379	1 ⊢ ((toInc‘𝐴) ∈ Dirset ↔ (𝐴 ∈ V ∧ 𝐴 ≠ ∅ ∧ ∀𝑥 ∈ 𝐴 ∀𝑦 ∈ 𝐴 ∃𝑧 ∈ 𝐴 (𝑥 ∪ 𝑦) ⊆ 𝑧))

Colors of variables: wff setvar class

Syntax hints: ¬ wn 3 ↔ wb 205 ∧ wa 396 ∧ w3a 1087 = wceq 1541 ∈ wcel 2106 ≠ wne 2940 ∀wral 3061 ∃wrex 3070 Vcvv 3474 ∪ cun 3946 ⊆ wss 3948 ∅c0 4322 class class class wbr 5148 ‘cfv 6543 Basecbs 17146 lecple 17206 Proset cproset 18248 Dirsetcdrs 18249 Posetcpo 18262 toInccipo 18482

This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1797 ax-4 1811 ax-5 1913 ax-6 1971 ax-7 2011 ax-8 2108 ax-9 2116 ax-10 2137 ax-11 2154 ax-12 2171 ax-ext 2703 ax-sep 5299 ax-nul 5306 ax-pow 5363 ax-pr 5427 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 397 df-or 846 df-3or 1088 df-3an 1089 df-tru 1544 df-fal 1554 df-ex 1782 df-nf 1786 df-sb 2068 df-mo 2534 df-eu 2563 df-clab 2710 df-cleq 2724 df-clel 2810 df-nfc 2885 df-ne 2941 df-nel 3047 df-ral 3062 df-rex 3071 df-reu 3377 df-rab 3433 df-v 3476 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 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 11252 df-mnf 11253 df-xr 11254 df-ltxr 11255 df-le 11256 df-sub 11448 df-neg 11449 df-nn 12215 df-2 12277 df-3 12278 df-4 12279 df-5 12280 df-6 12281 df-7 12282 df-8 12283 df-9 12284 df-n0 12475 df-z 12561 df-dec 12680 df-uz 12825 df-fz 13487 df-struct 17082 df-slot 17117 df-ndx 17129 df-base 17147 df-tset 17218 df-ple 17219 df-ocomp 17220 df-proset 18250 df-drs 18251 df-poset 18268 df-ipo 18483

This theorem is referenced by: ipodrscl 18493 fpwipodrs 18495 ipodrsima 18496 nacsfix 41532

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