isipodrs - Metamath Proof Explorer

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Theorem isipodrs 18486

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 18253	. . . 4 ⊢ ((toInc‘𝐴) ∈ Dirset → (Base‘(toInc‘𝐴)) ≠ ∅)
3	2	neneqd 2945	. . 3 ⊢ ((toInc‘𝐴) ∈ Dirset → ¬ (Base‘(toInc‘𝐴)) = ∅)
4		fvprc 6880	. . . . 5 ⊢ (¬ 𝐴 ∈ V → (toInc‘𝐴) = ∅)
5	4	fveq2d 6892	. . . 4 ⊢ (¬ 𝐴 ∈ V → (Base‘(toInc‘𝐴)) = (Base‘∅))
6		base0 17145	. . . 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 18250	. . 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 18485	. . . . . . 7 ⊢ (toInc‘𝐴) ∈ Poset
14		posprs 18265	. . . . . . 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 18480	. . . . . . 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 18483	. . . . . . . . . . . 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 18483	. . . . . . . . . . . 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 4183	. . . . . . . . . 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 3945 ⊆ wss 3947 ∅c0 4321 class class class wbr 5147 ‘cfv 6540 Basecbs 17140 lecple 17200 Proset cproset 18242 Dirsetcdrs 18243 Posetcpo 18256 toInccipo 18476

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 5298 ax-nul 5305 ax-pow 5362 ax-pr 5426 ax-un 7721 ax-cnex 11162 ax-resscn 11163 ax-1cn 11164 ax-icn 11165 ax-addcl 11166 ax-addrcl 11167 ax-mulcl 11168 ax-mulrcl 11169 ax-mulcom 11170 ax-addass 11171 ax-mulass 11172 ax-distr 11173 ax-i2m1 11174 ax-1ne0 11175 ax-1rid 11176 ax-rnegex 11177 ax-rrecex 11178 ax-cnre 11179 ax-pre-lttri 11180 ax-pre-lttrn 11181 ax-pre-ltadd 11182 ax-pre-mulgt0 11183

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 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 6297 df-ord 6364 df-on 6365 df-lim 6366 df-suc 6367 df-iota 6492 df-fun 6542 df-fn 6543 df-f 6544 df-f1 6545 df-fo 6546 df-f1o 6547 df-fv 6548 df-riota 7361 df-ov 7408 df-oprab 7409 df-mpo 7410 df-om 7852 df-1st 7971 df-2nd 7972 df-frecs 8262 df-wrecs 8293 df-recs 8367 df-rdg 8406 df-1o 8462 df-er 8699 df-en 8936 df-dom 8937 df-sdom 8938 df-fin 8939 df-pnf 11246 df-mnf 11247 df-xr 11248 df-ltxr 11249 df-le 11250 df-sub 11442 df-neg 11443 df-nn 12209 df-2 12271 df-3 12272 df-4 12273 df-5 12274 df-6 12275 df-7 12276 df-8 12277 df-9 12278 df-n0 12469 df-z 12555 df-dec 12674 df-uz 12819 df-fz 13481 df-struct 17076 df-slot 17111 df-ndx 17123 df-base 17141 df-tset 17212 df-ple 17213 df-ocomp 17214 df-proset 18244 df-drs 18245 df-poset 18262 df-ipo 18477

This theorem is referenced by: ipodrscl 18487 fpwipodrs 18489 ipodrsima 18490 nacsfix 41435

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