isipodrs - Metamath Proof Explorer

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Theorem isipodrs 18520

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 2727	. . . . 5 ⊢ (Base‘(toInc‘𝐴)) = (Base‘(toInc‘𝐴))
2	1	drsbn0 18287	. . . 4 ⊢ ((toInc‘𝐴) ∈ Dirset → (Base‘(toInc‘𝐴)) ≠ ∅)
3	2	neneqd 2940	. . 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 17176	. . . 4 ⊢ ∅ = (Base‘∅)
7	5, 6	eqtr4di 2785	. . 3 ⊢ (¬ 𝐴 ∈ V → (Base‘(toInc‘𝐴)) = ∅)
8	3, 7	nsyl2 141	. 2 ⊢ ((toInc‘𝐴) ∈ Dirset → 𝐴 ∈ V)
9		simp1 1134	. 2 ⊢ ((𝐴 ∈ V ∧ 𝐴 ≠ ∅ ∧ ∀𝑥 ∈ 𝐴 ∀𝑦 ∈ 𝐴 ∃𝑧 ∈ 𝐴 (𝑥 ∪ 𝑦) ⊆ 𝑧) → 𝐴 ∈ V)
10		eqid 2727	. . . 4 ⊢ (le‘(toInc‘𝐴)) = (le‘(toInc‘𝐴))
11	1, 10	isdrs 18284	. . 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 2727	. . . . . . . 8 ⊢ (toInc‘𝐴) = (toInc‘𝐴)
13	12	ipopos 18519	. . . . . . 7 ⊢ (toInc‘𝐴) ∈ Poset
14		posprs 18299	. . . . . . 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 265	. . . . 5 ⊢ (𝐴 ∈ V → ((toInc‘𝐴) ∈ Proset ↔ 𝐴 ∈ V))
18	12	ipobas 18514	. . . . . . 7 ⊢ (𝐴 ∈ V → 𝐴 = (Base‘(toInc‘𝐴)))
19		neeq1 2998	. . . . . . . 8 ⊢ (𝐴 = (Base‘(toInc‘𝐴)) → (𝐴 ≠ ∅ ↔ (Base‘(toInc‘𝐴)) ≠ ∅))
20		rexeq 3316	. . . . . . . . . 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 3328	. . . . . . . . 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 3328	. . . . . . . 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 630	. . . . . . 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 766	. . . . . . . . . . . 12 ⊢ (((𝐴 ∈ V ∧ (𝑥 ∈ 𝐴 ∧ 𝑦 ∈ 𝐴)) ∧ 𝑧 ∈ 𝐴) → 𝐴 ∈ V)
26		simplrl 776	. . . . . . . . . . . 12 ⊢ (((𝐴 ∈ V ∧ (𝑥 ∈ 𝐴 ∧ 𝑦 ∈ 𝐴)) ∧ 𝑧 ∈ 𝐴) → 𝑥 ∈ 𝐴)
27		simpr 484	. . . . . . . . . . . 12 ⊢ (((𝐴 ∈ V ∧ (𝑥 ∈ 𝐴 ∧ 𝑦 ∈ 𝐴)) ∧ 𝑧 ∈ 𝐴) → 𝑧 ∈ 𝐴)
28	12, 10	ipole 18517	. . . . . . . . . . . 12 ⊢ ((𝐴 ∈ V ∧ 𝑥 ∈ 𝐴 ∧ 𝑧 ∈ 𝐴) → (𝑥(le‘(toInc‘𝐴))𝑧 ↔ 𝑥 ⊆ 𝑧))
29	25, 26, 27, 28	syl3anc 1369	. . . . . . . . . . 11 ⊢ (((𝐴 ∈ V ∧ (𝑥 ∈ 𝐴 ∧ 𝑦 ∈ 𝐴)) ∧ 𝑧 ∈ 𝐴) → (𝑥(le‘(toInc‘𝐴))𝑧 ↔ 𝑥 ⊆ 𝑧))
30		simplrr 777	. . . . . . . . . . . 12 ⊢ (((𝐴 ∈ V ∧ (𝑥 ∈ 𝐴 ∧ 𝑦 ∈ 𝐴)) ∧ 𝑧 ∈ 𝐴) → 𝑦 ∈ 𝐴)
31	12, 10	ipole 18517	. . . . . . . . . . . 12 ⊢ ((𝐴 ∈ V ∧ 𝑦 ∈ 𝐴 ∧ 𝑧 ∈ 𝐴) → (𝑦(le‘(toInc‘𝐴))𝑧 ↔ 𝑦 ⊆ 𝑧))
32	25, 30, 27, 31	syl3anc 1369	. . . . . . . . . . 11 ⊢ (((𝐴 ∈ V ∧ (𝑥 ∈ 𝐴 ∧ 𝑦 ∈ 𝐴)) ∧ 𝑧 ∈ 𝐴) → (𝑦(le‘(toInc‘𝐴))𝑧 ↔ 𝑦 ⊆ 𝑧))
33	29, 32	anbi12d 630	. . . . . . . . . 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 4180	. . . . . . . . . 10 ⊢ ((𝑥 ⊆ 𝑧 ∧ 𝑦 ⊆ 𝑧) ↔ (𝑥 ∪ 𝑦) ⊆ 𝑧)
35	33, 34	bitrdi 287	. . . . . . . . 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 3171	. . . . . . . 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 3211	. . . . . . 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 628	. . . . . 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 281	. . . . 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 630	. . . 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 1093	. . . 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 1093	. . . 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 314	. . 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 283	. 2 ⊢ (𝐴 ∈ V → ((toInc‘𝐴) ∈ Dirset ↔ (𝐴 ∈ V ∧ 𝐴 ≠ ∅ ∧ ∀𝑥 ∈ 𝐴 ∀𝑦 ∈ 𝐴 ∃𝑧 ∈ 𝐴 (𝑥 ∪ 𝑦) ⊆ 𝑧)))
45	8, 9, 44	pm5.21nii 378	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 395 ∧ w3a 1085 = wceq 1534 ∈ wcel 2099 ≠ wne 2935 ∀wral 3056 ∃wrex 3065 Vcvv 3469 ∪ cun 3942 ⊆ wss 3944 ∅c0 4318 class class class wbr 5142 ‘cfv 6542 Basecbs 17171 lecple 17231 Proset cproset 18276 Dirsetcdrs 18277 Posetcpo 18290 toInccipo 18510

This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1790 ax-4 1804 ax-5 1906 ax-6 1964 ax-7 2004 ax-8 2101 ax-9 2109 ax-10 2130 ax-11 2147 ax-12 2164 ax-ext 2698 ax-sep 5293 ax-nul 5300 ax-pow 5359 ax-pr 5423 ax-un 7734 ax-cnex 11186 ax-resscn 11187 ax-1cn 11188 ax-icn 11189 ax-addcl 11190 ax-addrcl 11191 ax-mulcl 11192 ax-mulrcl 11193 ax-mulcom 11194 ax-addass 11195 ax-mulass 11196 ax-distr 11197 ax-i2m1 11198 ax-1ne0 11199 ax-1rid 11200 ax-rnegex 11201 ax-rrecex 11202 ax-cnre 11203 ax-pre-lttri 11204 ax-pre-lttrn 11205 ax-pre-ltadd 11206 ax-pre-mulgt0 11207

This theorem depends on definitions: df-bi 206 df-an 396 df-or 847 df-3or 1086 df-3an 1087 df-tru 1537 df-fal 1547 df-ex 1775 df-nf 1779 df-sb 2061 df-mo 2529 df-eu 2558 df-clab 2705 df-cleq 2719 df-clel 2805 df-nfc 2880 df-ne 2936 df-nel 3042 df-ral 3057 df-rex 3066 df-reu 3372 df-rab 3428 df-v 3471 df-sbc 3775 df-csb 3890 df-dif 3947 df-un 3949 df-in 3951 df-ss 3961 df-pss 3963 df-nul 4319 df-if 4525 df-pw 4600 df-sn 4625 df-pr 4627 df-op 4631 df-uni 4904 df-iun 4993 df-br 5143 df-opab 5205 df-mpt 5226 df-tr 5260 df-id 5570 df-eprel 5576 df-po 5584 df-so 5585 df-fr 5627 df-we 5629 df-xp 5678 df-rel 5679 df-cnv 5680 df-co 5681 df-dm 5682 df-rn 5683 df-res 5684 df-ima 5685 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 7370 df-ov 7417 df-oprab 7418 df-mpo 7419 df-om 7865 df-1st 7987 df-2nd 7988 df-frecs 8280 df-wrecs 8311 df-recs 8385 df-rdg 8424 df-1o 8480 df-er 8718 df-en 8956 df-dom 8957 df-sdom 8958 df-fin 8959 df-pnf 11272 df-mnf 11273 df-xr 11274 df-ltxr 11275 df-le 11276 df-sub 11468 df-neg 11469 df-nn 12235 df-2 12297 df-3 12298 df-4 12299 df-5 12300 df-6 12301 df-7 12302 df-8 12303 df-9 12304 df-n0 12495 df-z 12581 df-dec 12700 df-uz 12845 df-fz 13509 df-struct 17107 df-slot 17142 df-ndx 17154 df-base 17172 df-tset 17243 df-ple 17244 df-ocomp 17245 df-proset 18278 df-drs 18279 df-poset 18296 df-ipo 18511

This theorem is referenced by: ipodrscl 18521 fpwipodrs 18523 ipodrsima 18524 nacsfix 42054

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