Theorem plngval 29110

Description: The plane defined by a line 𝐴 and a point 𝑅 outside of 𝐴. This is defined as the union of 3 parts: the line itself, the open half-plane containing 𝑅, and the points opposite to 𝑅 (see islnopp 29071). (Contributed by Thierry Arnoux, 17-Jun-2026.)

Hypotheses

Ref	Expression
plngval.p	⊢ 𝑃 = (Base‘𝐺)
plngval.i	⊢ 𝐼 = (Itv‘𝐺)
plngval.1	⊢ 𝐿 = (LineG‘𝐺)
plngval.e	⊢ 𝐸 = (hlG‘𝐺)
plngval.g	⊢ (𝜑 → 𝐺 ∈ TarskiG)
plngval.a	⊢ (𝜑 → 𝐴 ∈ ran 𝐿)
plngval.r	⊢ (𝜑 → 𝑅 ∈ (𝑃 ∖ 𝐴))

Assertion

Ref	Expression
plngval	⊢ (𝜑 → (𝐴𝐸𝑅) = {𝑥 ∈ 𝑃 ∣ (𝑥 ∈ 𝐴 ∨ 𝑥((hpG‘𝐺)‘𝐴)𝑅 ∨ ∃𝑡 ∈ 𝐴 𝑡 ∈ (𝑥𝐼𝑅))})

Distinct variable groups:   𝑡,𝐴,𝑥   𝑡,𝐺,𝑥   𝑥,𝑃   𝑡,𝑅,𝑥   𝜑,𝑡,𝑥

Allowed substitution hints:   𝑃(𝑡)   𝐸(𝑥, 𝑡)   𝐼(𝑥, 𝑡)   𝐿(𝑥, 𝑡)

Proof of Theorem plngval

Dummy variables 𝑎 𝑟 𝑔 are mutually distinct and distinct from all other variables.

Step	Hyp	Ref	Expression
1		plngval.e	. . 3 ⊢ 𝐸 = (hlG‘𝐺)
2		df-plng 29107	. . . 4 ⊢ hlG = (𝑔 ∈ V ↦ (𝑎 ∈ ran (LineG‘𝑔), 𝑟 ∈ ((Base‘𝑔) ∖ 𝑎) ↦ {𝑥 ∈ (Base‘𝑔) ∣ (𝑥 ∈ 𝑎 ∨ 𝑥((hpG‘𝑔)‘𝑎)𝑟 ∨ ∃𝑡 ∈ 𝑎 𝑡 ∈ (𝑥(Itv‘𝑔)𝑟))}))
3		fveq2 6885	. . . . . . 7 ⊢ (𝑔 = 𝐺 → (LineG‘𝑔) = (LineG‘𝐺))
4		plngval.1	. . . . . . 7 ⊢ 𝐿 = (LineG‘𝐺)
5	3, 4	eqtr4di 2818	. . . . . 6 ⊢ (𝑔 = 𝐺 → (LineG‘𝑔) = 𝐿)
6	5	rneqd 5930	. . . . 5 ⊢ (𝑔 = 𝐺 → ran (LineG‘𝑔) = ran 𝐿)
7		fveq2 6885	. . . . . . 7 ⊢ (𝑔 = 𝐺 → (Base‘𝑔) = (Base‘𝐺))
8		plngval.p	. . . . . . 7 ⊢ 𝑃 = (Base‘𝐺)
9	7, 8	eqtr4di 2818	. . . . . 6 ⊢ (𝑔 = 𝐺 → (Base‘𝑔) = 𝑃)
10	9	difeq1d 4080	. . . . 5 ⊢ (𝑔 = 𝐺 → ((Base‘𝑔) ∖ 𝑎) = (𝑃 ∖ 𝑎))
11		biidd 265	. . . . . . 7 ⊢ (𝑔 = 𝐺 → (𝑥 ∈ 𝑎 ↔ 𝑥 ∈ 𝑎))
12		fveq2 6885	. . . . . . . . 9 ⊢ (𝑔 = 𝐺 → (hpG‘𝑔) = (hpG‘𝐺))
13	12	fveq1d 6887	. . . . . . . 8 ⊢ (𝑔 = 𝐺 → ((hpG‘𝑔)‘𝑎) = ((hpG‘𝐺)‘𝑎))
14	13	breqd 5122	. . . . . . 7 ⊢ (𝑔 = 𝐺 → (𝑥((hpG‘𝑔)‘𝑎)𝑟 ↔ 𝑥((hpG‘𝐺)‘𝑎)𝑟))
15		fveq2 6885	. . . . . . . . . . 11 ⊢ (𝑔 = 𝐺 → (Itv‘𝑔) = (Itv‘𝐺))
16		plngval.i	. . . . . . . . . . 11 ⊢ 𝐼 = (Itv‘𝐺)
17	15, 16	eqtr4di 2818	. . . . . . . . . 10 ⊢ (𝑔 = 𝐺 → (Itv‘𝑔) = 𝐼)
18	17	oveqd 7436	. . . . . . . . 9 ⊢ (𝑔 = 𝐺 → (𝑥(Itv‘𝑔)𝑟) = (𝑥𝐼𝑟))
19	18	eleq2d 2851	. . . . . . . 8 ⊢ (𝑔 = 𝐺 → (𝑡 ∈ (𝑥(Itv‘𝑔)𝑟) ↔ 𝑡 ∈ (𝑥𝐼𝑟)))
20	19	rexbidv 3191	. . . . . . 7 ⊢ (𝑔 = 𝐺 → (∃𝑡 ∈ 𝑎 𝑡 ∈ (𝑥(Itv‘𝑔)𝑟) ↔ ∃𝑡 ∈ 𝑎 𝑡 ∈ (𝑥𝐼𝑟)))
21	11, 14, 20	3orbi123d 1463	. . . . . 6 ⊢ (𝑔 = 𝐺 → ((𝑥 ∈ 𝑎 ∨ 𝑥((hpG‘𝑔)‘𝑎)𝑟 ∨ ∃𝑡 ∈ 𝑎 𝑡 ∈ (𝑥(Itv‘𝑔)𝑟)) ↔ (𝑥 ∈ 𝑎 ∨ 𝑥((hpG‘𝐺)‘𝑎)𝑟 ∨ ∃𝑡 ∈ 𝑎 𝑡 ∈ (𝑥𝐼𝑟))))
22	9, 21	rabeqbidv 3436	. . . . 5 ⊢ (𝑔 = 𝐺 → {𝑥 ∈ (Base‘𝑔) ∣ (𝑥 ∈ 𝑎 ∨ 𝑥((hpG‘𝑔)‘𝑎)𝑟 ∨ ∃𝑡 ∈ 𝑎 𝑡 ∈ (𝑥(Itv‘𝑔)𝑟))} = {𝑥 ∈ 𝑃 ∣ (𝑥 ∈ 𝑎 ∨ 𝑥((hpG‘𝐺)‘𝑎)𝑟 ∨ ∃𝑡 ∈ 𝑎 𝑡 ∈ (𝑥𝐼𝑟))})
23	6, 10, 22	mpoeq123dv 7494	. . . 4 ⊢ (𝑔 = 𝐺 → (𝑎 ∈ ran (LineG‘𝑔), 𝑟 ∈ ((Base‘𝑔) ∖ 𝑎) ↦ {𝑥 ∈ (Base‘𝑔) ∣ (𝑥 ∈ 𝑎 ∨ 𝑥((hpG‘𝑔)‘𝑎)𝑟 ∨ ∃𝑡 ∈ 𝑎 𝑡 ∈ (𝑥(Itv‘𝑔)𝑟))}) = (𝑎 ∈ ran 𝐿, 𝑟 ∈ (𝑃 ∖ 𝑎) ↦ {𝑥 ∈ 𝑃 ∣ (𝑥 ∈ 𝑎 ∨ 𝑥((hpG‘𝐺)‘𝑎)𝑟 ∨ ∃𝑡 ∈ 𝑎 𝑡 ∈ (𝑥𝐼𝑟))}))
24		plngval.g	. . . . 5 ⊢ (𝜑 → 𝐺 ∈ TarskiG)
25	24	elexd 3480	. . . 4 ⊢ (𝜑 → 𝐺 ∈ V)
26	4	fvexi 6899	. . . . . . 7 ⊢ 𝐿 ∈ V
27	26	rnex 7913	. . . . . 6 ⊢ ran 𝐿 ∈ V
28	27	a1i 11	. . . . 5 ⊢ (𝜑 → ran 𝐿 ∈ V)
29	8	fvexi 6899	. . . . . . 7 ⊢ 𝑃 ∈ V
30	29	difexi 5303	. . . . . 6 ⊢ (𝑃 ∖ 𝑎) ∈ V
31	30	a1i 11	. . . . 5 ⊢ ((𝜑 ∧ 𝑎 ∈ ran 𝐿) → (𝑃 ∖ 𝑎) ∈ V)
32	28, 31	mpoexd 8083	. . . 4 ⊢ (𝜑 → (𝑎 ∈ ran 𝐿, 𝑟 ∈ (𝑃 ∖ 𝑎) ↦ {𝑥 ∈ 𝑃 ∣ (𝑥 ∈ 𝑎 ∨ 𝑥((hpG‘𝐺)‘𝑎)𝑟 ∨ ∃𝑡 ∈ 𝑎 𝑡 ∈ (𝑥𝐼𝑟))}) ∈ V)
33	2, 23, 25, 32	fvmptd3 7017	. . 3 ⊢ (𝜑 → (hlG‘𝐺) = (𝑎 ∈ ran 𝐿, 𝑟 ∈ (𝑃 ∖ 𝑎) ↦ {𝑥 ∈ 𝑃 ∣ (𝑥 ∈ 𝑎 ∨ 𝑥((hpG‘𝐺)‘𝑎)𝑟 ∨ ∃𝑡 ∈ 𝑎 𝑡 ∈ (𝑥𝐼𝑟))}))
34	1, 33	eqtrid 2812	. 2 ⊢ (𝜑 → 𝐸 = (𝑎 ∈ ran 𝐿, 𝑟 ∈ (𝑃 ∖ 𝑎) ↦ {𝑥 ∈ 𝑃 ∣ (𝑥 ∈ 𝑎 ∨ 𝑥((hpG‘𝐺)‘𝑎)𝑟 ∨ ∃𝑡 ∈ 𝑎 𝑡 ∈ (𝑥𝐼𝑟))}))
35		plngval.a	. . 3 ⊢ (𝜑 → 𝐴 ∈ ran 𝐿)
36		plngval.r	. . . . 5 ⊢ (𝜑 → 𝑅 ∈ (𝑃 ∖ 𝐴))
37	36	adantr 486	. . . 4 ⊢ ((𝜑 ∧ 𝑎 = 𝐴) → 𝑅 ∈ (𝑃 ∖ 𝐴))
38		difeq2 4075	. . . . 5 ⊢ (𝑎 = 𝐴 → (𝑃 ∖ 𝑎) = (𝑃 ∖ 𝐴))
39	38	adantl 487	. . . 4 ⊢ ((𝜑 ∧ 𝑎 = 𝐴) → (𝑃 ∖ 𝑎) = (𝑃 ∖ 𝐴))
40	37, 39	eleqtrrd 2868	. . 3 ⊢ ((𝜑 ∧ 𝑎 = 𝐴) → 𝑅 ∈ (𝑃 ∖ 𝑎))
41		eqid 2765	. . . 4 ⊢ {𝑥 ∈ 𝑃 ∣ (𝑥 ∈ 𝑎 ∨ 𝑥((hpG‘𝐺)‘𝑎)𝑟 ∨ ∃𝑡 ∈ 𝑎 𝑡 ∈ (𝑥𝐼𝑟))} = {𝑥 ∈ 𝑃 ∣ (𝑥 ∈ 𝑎 ∨ 𝑥((hpG‘𝐺)‘𝑎)𝑟 ∨ ∃𝑡 ∈ 𝑎 𝑡 ∈ (𝑥𝐼𝑟))}
42	29	a1i 11	. . . 4 ⊢ ((𝜑 ∧ (𝑎 = 𝐴 ∧ 𝑟 = 𝑅)) → 𝑃 ∈ V)
43	41, 42	rabexd 5312	. . 3 ⊢ ((𝜑 ∧ (𝑎 = 𝐴 ∧ 𝑟 = 𝑅)) → {𝑥 ∈ 𝑃 ∣ (𝑥 ∈ 𝑎 ∨ 𝑥((hpG‘𝐺)‘𝑎)𝑟 ∨ ∃𝑡 ∈ 𝑎 𝑡 ∈ (𝑥𝐼𝑟))} ∈ V)
44		eleq2w2 2761	. . . . . 6 ⊢ (𝑎 = 𝐴 → (𝑥 ∈ 𝑎 ↔ 𝑥 ∈ 𝐴))
45	44	ad2antrl 741	. . . . 5 ⊢ ((𝜑 ∧ (𝑎 = 𝐴 ∧ 𝑟 = 𝑅)) → (𝑥 ∈ 𝑎 ↔ 𝑥 ∈ 𝐴))
46		eqidd 2766	. . . . . 6 ⊢ ((𝜑 ∧ (𝑎 = 𝐴 ∧ 𝑟 = 𝑅)) → 𝑥 = 𝑥)
47		fveq2 6885	. . . . . . 7 ⊢ (𝑎 = 𝐴 → ((hpG‘𝐺)‘𝑎) = ((hpG‘𝐺)‘𝐴))
48	47	ad2antrl 741	. . . . . 6 ⊢ ((𝜑 ∧ (𝑎 = 𝐴 ∧ 𝑟 = 𝑅)) → ((hpG‘𝐺)‘𝑎) = ((hpG‘𝐺)‘𝐴))
49		simprr 785	. . . . . 6 ⊢ ((𝜑 ∧ (𝑎 = 𝐴 ∧ 𝑟 = 𝑅)) → 𝑟 = 𝑅)
50	46, 48, 49	breq123d 5125	. . . . 5 ⊢ ((𝜑 ∧ (𝑎 = 𝐴 ∧ 𝑟 = 𝑅)) → (𝑥((hpG‘𝐺)‘𝑎)𝑟 ↔ 𝑥((hpG‘𝐺)‘𝐴)𝑅))
51		simprl 783	. . . . . 6 ⊢ ((𝜑 ∧ (𝑎 = 𝐴 ∧ 𝑟 = 𝑅)) → 𝑎 = 𝐴)
52	49	oveq2d 7435	. . . . . . 7 ⊢ ((𝜑 ∧ (𝑎 = 𝐴 ∧ 𝑟 = 𝑅)) → (𝑥𝐼𝑟) = (𝑥𝐼𝑅))
53	52	eleq2d 2851	. . . . . 6 ⊢ ((𝜑 ∧ (𝑎 = 𝐴 ∧ 𝑟 = 𝑅)) → (𝑡 ∈ (𝑥𝐼𝑟) ↔ 𝑡 ∈ (𝑥𝐼𝑅)))
54	51, 53	rexeqbidv 3341	. . . . 5 ⊢ ((𝜑 ∧ (𝑎 = 𝐴 ∧ 𝑟 = 𝑅)) → (∃𝑡 ∈ 𝑎 𝑡 ∈ (𝑥𝐼𝑟) ↔ ∃𝑡 ∈ 𝐴 𝑡 ∈ (𝑥𝐼𝑅)))
55	45, 50, 54	3orbi123d 1463	. . . 4 ⊢ ((𝜑 ∧ (𝑎 = 𝐴 ∧ 𝑟 = 𝑅)) → ((𝑥 ∈ 𝑎 ∨ 𝑥((hpG‘𝐺)‘𝑎)𝑟 ∨ ∃𝑡 ∈ 𝑎 𝑡 ∈ (𝑥𝐼𝑟)) ↔ (𝑥 ∈ 𝐴 ∨ 𝑥((hpG‘𝐺)‘𝐴)𝑅 ∨ ∃𝑡 ∈ 𝐴 𝑡 ∈ (𝑥𝐼𝑅))))
56	55	rabbidv 3425	. . 3 ⊢ ((𝜑 ∧ (𝑎 = 𝐴 ∧ 𝑟 = 𝑅)) → {𝑥 ∈ 𝑃 ∣ (𝑥 ∈ 𝑎 ∨ 𝑥((hpG‘𝐺)‘𝑎)𝑟 ∨ ∃𝑡 ∈ 𝑎 𝑡 ∈ (𝑥𝐼𝑟))} = {𝑥 ∈ 𝑃 ∣ (𝑥 ∈ 𝐴 ∨ 𝑥((hpG‘𝐺)‘𝐴)𝑅 ∨ ∃𝑡 ∈ 𝐴 𝑡 ∈ (𝑥𝐼𝑅))})
57	35, 40, 43, 56	ovmpodv2 7577	. 2 ⊢ (𝜑 → (𝐸 = (𝑎 ∈ ran 𝐿, 𝑟 ∈ (𝑃 ∖ 𝑎) ↦ {𝑥 ∈ 𝑃 ∣ (𝑥 ∈ 𝑎 ∨ 𝑥((hpG‘𝐺)‘𝑎)𝑟 ∨ ∃𝑡 ∈ 𝑎 𝑡 ∈ (𝑥𝐼𝑟))}) → (𝐴𝐸𝑅) = {𝑥 ∈ 𝑃 ∣ (𝑥 ∈ 𝐴 ∨ 𝑥((hpG‘𝐺)‘𝐴)𝑅 ∨ ∃𝑡 ∈ 𝐴 𝑡 ∈ (𝑥𝐼𝑅))}))
58	34, 57	mpd 16	1 ⊢ (𝜑 → (𝐴𝐸𝑅) = {𝑥 ∈ 𝑃 ∣ (𝑥 ∈ 𝐴 ∨ 𝑥((hpG‘𝐺)‘𝐴)𝑅 ∨ ∃𝑡 ∈ 𝐴 𝑡 ∈ (𝑥𝐼𝑅))})

This proof depends on syntax axioms:   → wi 4   ↔ wb 209   ∧ wa 401   ∨ w3o 1102   = wceq 1570   ∈ wcel 2146  ∃wrex 3091  {crab 3418  Vcvv 3457   ∖ cdif 3903   class class class wbr 5111  ran crn 5664  ‘cfv 6540  (class class class)co 7419   ∈ cmpo 7421  Basecbs 17291  TarskiGcstrkg 28747  Itvcitv 28753  LineGclng 28754  hpGchpg 29090  hlGcplng 29106

This proof depends on axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1828  ax-4 1842  ax-5 1943  ax-6 2000  ax-7 2041  ax-8 2148  ax-9 2156  ax-10 2179  ax-11 2195  ax-12 2216  ax-ext 2737  ax-rep 5240  ax-sep 5259  ax-nul 5271  ax-pow 5338  ax-pr 5406  ax-un 7742

This proof depends on definitions:  df-bi 210  df-an 402  df-or 862  df-3or 1104  df-3an 1105  df-tru 1573  df-fal 1583  df-ex 1813  df-nf 1817  df-sb 2100  df-mo 2569  df-eu 2599  df-clab 2744  df-cleq 2757  df-clel 2840  df-nfc 2914  df-ne 2961  df-ral 3082  df-rex 3092  df-reu 3372  df-rab 3419  df-v 3459  df-sbc 3747  df-csb 3855  df-dif 3909  df-un 3911  df-in 3913  df-ss 3923  df-nul 4287  df-if 4490  df-pw 4566  df-sn 4592  df-pr 4594  df-op 4598  df-uni 4875  df-iun 4960  df-br 5112  df-opab 5176  df-mpt 5195  df-id 5558  df-xp 5669  df-rel 5670  df-cnv 5671  df-co 5672  df-dm 5673  df-rn 5674  df-res 5675  df-ima 5676  df-iota 6496  df-fun 6542  df-fn 6543  df-f 6544  df-f1 6545  df-fo 6546  df-f1o 6547  df-fv 6548  df-ov 7422  df-oprab 7423  df-mpo 7424  df-1st 7992  df-2nd 7993  df-plng 29107

This theorem is used by:  isplng  29111  plngrnssp  29112  elplng  29113  plngssp  29114  plngcplem  29118