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Theorem isperp2 28400

Description: Property for 2 lines A, B, intersecting at a point X to be perpendicular. Item (i) of definition 8.13 of [Schwabhauser] p. 59. (Contributed by Thierry Arnoux, 16-Oct-2019.)

**Hypotheses**
Ref	Expression
isperp.p	⊢ 𝑃 = (Base‘𝐺)
isperp.d	⊢ − = (dist‘𝐺)
isperp.i	⊢ 𝐼 = (Itv‘𝐺)
isperp.l	⊢ 𝐿 = (LineG‘𝐺)
isperp.g	⊢ (𝜑 → 𝐺 ∈ TarskiG)
isperp.a	⊢ (𝜑 → 𝐴 ∈ ran 𝐿)
isperp2.b	⊢ (𝜑 → 𝐵 ∈ ran 𝐿)
isperp2.x	⊢ (𝜑 → 𝑋 ∈ (𝐴 ∩ 𝐵))

**Assertion**
Ref	Expression
isperp2	⊢ (𝜑 → (𝐴(⟂G‘𝐺)𝐵 ↔ ∀𝑢 ∈ 𝐴 ∀𝑣 ∈ 𝐵 ⟨“𝑢𝑋𝑣”⟩ ∈ (∟G‘𝐺)))

Distinct variable groups: 𝑣,𝑢,𝐴 𝑢,𝐵,𝑣 𝑢,𝐺,𝑣 𝜑,𝑢,𝑣 𝑢,𝑋,𝑣 Allowed substitution hints: 𝑃(𝑣,𝑢) 𝐼(𝑣,𝑢) 𝐿(𝑣,𝑢) − (𝑣,𝑢)

Proof of Theorem isperp2 Dummy variable 𝑥 is distinct from all other variables.

Step	Hyp	Ref	Expression
1		eqidd 2732	. . . . . . . . 9 ⊢ (((((𝜑 ∧ 𝐴(⟂G‘𝐺)𝐵) ∧ 𝑥 ∈ (𝐴 ∩ 𝐵)) ∧ 𝑢 ∈ 𝐴) ∧ 𝑣 ∈ 𝐵) → 𝑢 = 𝑢)
2		isperp.p	. . . . . . . . . 10 ⊢ 𝑃 = (Base‘𝐺)
3		isperp.i	. . . . . . . . . 10 ⊢ 𝐼 = (Itv‘𝐺)
4		isperp.l	. . . . . . . . . 10 ⊢ 𝐿 = (LineG‘𝐺)
5		isperp.g	. . . . . . . . . . 11 ⊢ (𝜑 → 𝐺 ∈ TarskiG)
6	5	ad4antr 729	. . . . . . . . . 10 ⊢ (((((𝜑 ∧ 𝐴(⟂G‘𝐺)𝐵) ∧ 𝑥 ∈ (𝐴 ∩ 𝐵)) ∧ 𝑢 ∈ 𝐴) ∧ 𝑣 ∈ 𝐵) → 𝐺 ∈ TarskiG)
7		isperp.a	. . . . . . . . . . 11 ⊢ (𝜑 → 𝐴 ∈ ran 𝐿)
8	7	ad4antr 729	. . . . . . . . . 10 ⊢ (((((𝜑 ∧ 𝐴(⟂G‘𝐺)𝐵) ∧ 𝑥 ∈ (𝐴 ∩ 𝐵)) ∧ 𝑢 ∈ 𝐴) ∧ 𝑣 ∈ 𝐵) → 𝐴 ∈ ran 𝐿)
9		isperp2.b	. . . . . . . . . . 11 ⊢ (𝜑 → 𝐵 ∈ ran 𝐿)
10	9	ad4antr 729	. . . . . . . . . 10 ⊢ (((((𝜑 ∧ 𝐴(⟂G‘𝐺)𝐵) ∧ 𝑥 ∈ (𝐴 ∩ 𝐵)) ∧ 𝑢 ∈ 𝐴) ∧ 𝑣 ∈ 𝐵) → 𝐵 ∈ ran 𝐿)
11		isperp.d	. . . . . . . . . . 11 ⊢ − = (dist‘𝐺)
12		simp-4r 781	. . . . . . . . . . 11 ⊢ (((((𝜑 ∧ 𝐴(⟂G‘𝐺)𝐵) ∧ 𝑥 ∈ (𝐴 ∩ 𝐵)) ∧ 𝑢 ∈ 𝐴) ∧ 𝑣 ∈ 𝐵) → 𝐴(⟂G‘𝐺)𝐵)
13	2, 11, 3, 4, 6, 8, 10, 12	perpneq 28399	. . . . . . . . . 10 ⊢ (((((𝜑 ∧ 𝐴(⟂G‘𝐺)𝐵) ∧ 𝑥 ∈ (𝐴 ∩ 𝐵)) ∧ 𝑢 ∈ 𝐴) ∧ 𝑣 ∈ 𝐵) → 𝐴 ≠ 𝐵)
14		simpllr 773	. . . . . . . . . 10 ⊢ (((((𝜑 ∧ 𝐴(⟂G‘𝐺)𝐵) ∧ 𝑥 ∈ (𝐴 ∩ 𝐵)) ∧ 𝑢 ∈ 𝐴) ∧ 𝑣 ∈ 𝐵) → 𝑥 ∈ (𝐴 ∩ 𝐵))
15		isperp2.x	. . . . . . . . . . 11 ⊢ (𝜑 → 𝑋 ∈ (𝐴 ∩ 𝐵))
16	15	ad4antr 729	. . . . . . . . . 10 ⊢ (((((𝜑 ∧ 𝐴(⟂G‘𝐺)𝐵) ∧ 𝑥 ∈ (𝐴 ∩ 𝐵)) ∧ 𝑢 ∈ 𝐴) ∧ 𝑣 ∈ 𝐵) → 𝑋 ∈ (𝐴 ∩ 𝐵))
17	2, 3, 4, 6, 8, 10, 13, 14, 16	tglineineq 28328	. . . . . . . . 9 ⊢ (((((𝜑 ∧ 𝐴(⟂G‘𝐺)𝐵) ∧ 𝑥 ∈ (𝐴 ∩ 𝐵)) ∧ 𝑢 ∈ 𝐴) ∧ 𝑣 ∈ 𝐵) → 𝑥 = 𝑋)
18		eqidd 2732	. . . . . . . . 9 ⊢ (((((𝜑 ∧ 𝐴(⟂G‘𝐺)𝐵) ∧ 𝑥 ∈ (𝐴 ∩ 𝐵)) ∧ 𝑢 ∈ 𝐴) ∧ 𝑣 ∈ 𝐵) → 𝑣 = 𝑣)
19	1, 17, 18	s3eqd 14822	. . . . . . . 8 ⊢ (((((𝜑 ∧ 𝐴(⟂G‘𝐺)𝐵) ∧ 𝑥 ∈ (𝐴 ∩ 𝐵)) ∧ 𝑢 ∈ 𝐴) ∧ 𝑣 ∈ 𝐵) → ⟨“𝑢𝑥𝑣”⟩ = ⟨“𝑢𝑋𝑣”⟩)
20	19	eleq1d 2817	. . . . . . 7 ⊢ (((((𝜑 ∧ 𝐴(⟂G‘𝐺)𝐵) ∧ 𝑥 ∈ (𝐴 ∩ 𝐵)) ∧ 𝑢 ∈ 𝐴) ∧ 𝑣 ∈ 𝐵) → (⟨“𝑢𝑥𝑣”⟩ ∈ (∟G‘𝐺) ↔ ⟨“𝑢𝑋𝑣”⟩ ∈ (∟G‘𝐺)))
21	20	biimpd 228	. . . . . 6 ⊢ (((((𝜑 ∧ 𝐴(⟂G‘𝐺)𝐵) ∧ 𝑥 ∈ (𝐴 ∩ 𝐵)) ∧ 𝑢 ∈ 𝐴) ∧ 𝑣 ∈ 𝐵) → (⟨“𝑢𝑥𝑣”⟩ ∈ (∟G‘𝐺) → ⟨“𝑢𝑋𝑣”⟩ ∈ (∟G‘𝐺)))
22	21	ralimdva 3166	. . . . 5 ⊢ ((((𝜑 ∧ 𝐴(⟂G‘𝐺)𝐵) ∧ 𝑥 ∈ (𝐴 ∩ 𝐵)) ∧ 𝑢 ∈ 𝐴) → (∀𝑣 ∈ 𝐵 ⟨“𝑢𝑥𝑣”⟩ ∈ (∟G‘𝐺) → ∀𝑣 ∈ 𝐵 ⟨“𝑢𝑋𝑣”⟩ ∈ (∟G‘𝐺)))
23	22	ralimdva 3166	. . . 4 ⊢ (((𝜑 ∧ 𝐴(⟂G‘𝐺)𝐵) ∧ 𝑥 ∈ (𝐴 ∩ 𝐵)) → (∀𝑢 ∈ 𝐴 ∀𝑣 ∈ 𝐵 ⟨“𝑢𝑥𝑣”⟩ ∈ (∟G‘𝐺) → ∀𝑢 ∈ 𝐴 ∀𝑣 ∈ 𝐵 ⟨“𝑢𝑋𝑣”⟩ ∈ (∟G‘𝐺)))
24	23	imp 406	. . 3 ⊢ ((((𝜑 ∧ 𝐴(⟂G‘𝐺)𝐵) ∧ 𝑥 ∈ (𝐴 ∩ 𝐵)) ∧ ∀𝑢 ∈ 𝐴 ∀𝑣 ∈ 𝐵 ⟨“𝑢𝑥𝑣”⟩ ∈ (∟G‘𝐺)) → ∀𝑢 ∈ 𝐴 ∀𝑣 ∈ 𝐵 ⟨“𝑢𝑋𝑣”⟩ ∈ (∟G‘𝐺))
25	2, 11, 3, 4, 5, 7, 9	isperp 28397	. . . 4 ⊢ (𝜑 → (𝐴(⟂G‘𝐺)𝐵 ↔ ∃𝑥 ∈ (𝐴 ∩ 𝐵)∀𝑢 ∈ 𝐴 ∀𝑣 ∈ 𝐵 ⟨“𝑢𝑥𝑣”⟩ ∈ (∟G‘𝐺)))
26	25	biimpa 476	. . 3 ⊢ ((𝜑 ∧ 𝐴(⟂G‘𝐺)𝐵) → ∃𝑥 ∈ (𝐴 ∩ 𝐵)∀𝑢 ∈ 𝐴 ∀𝑣 ∈ 𝐵 ⟨“𝑢𝑥𝑣”⟩ ∈ (∟G‘𝐺))
27	24, 26	r19.29a 3161	. 2 ⊢ ((𝜑 ∧ 𝐴(⟂G‘𝐺)𝐵) → ∀𝑢 ∈ 𝐴 ∀𝑣 ∈ 𝐵 ⟨“𝑢𝑋𝑣”⟩ ∈ (∟G‘𝐺))
28		s3eq2 14828	. . . . . . 7 ⊢ (𝑥 = 𝑋 → ⟨“𝑢𝑥𝑣”⟩ = ⟨“𝑢𝑋𝑣”⟩)
29	28	eleq1d 2817	. . . . . 6 ⊢ (𝑥 = 𝑋 → (⟨“𝑢𝑥𝑣”⟩ ∈ (∟G‘𝐺) ↔ ⟨“𝑢𝑋𝑣”⟩ ∈ (∟G‘𝐺)))
30	29	2ralbidv 3217	. . . . 5 ⊢ (𝑥 = 𝑋 → (∀𝑢 ∈ 𝐴 ∀𝑣 ∈ 𝐵 ⟨“𝑢𝑥𝑣”⟩ ∈ (∟G‘𝐺) ↔ ∀𝑢 ∈ 𝐴 ∀𝑣 ∈ 𝐵 ⟨“𝑢𝑋𝑣”⟩ ∈ (∟G‘𝐺)))
31	30	rspcev 3612	. . . 4 ⊢ ((𝑋 ∈ (𝐴 ∩ 𝐵) ∧ ∀𝑢 ∈ 𝐴 ∀𝑣 ∈ 𝐵 ⟨“𝑢𝑋𝑣”⟩ ∈ (∟G‘𝐺)) → ∃𝑥 ∈ (𝐴 ∩ 𝐵)∀𝑢 ∈ 𝐴 ∀𝑣 ∈ 𝐵 ⟨“𝑢𝑥𝑣”⟩ ∈ (∟G‘𝐺))
32	15, 31	sylan 579	. . 3 ⊢ ((𝜑 ∧ ∀𝑢 ∈ 𝐴 ∀𝑣 ∈ 𝐵 ⟨“𝑢𝑋𝑣”⟩ ∈ (∟G‘𝐺)) → ∃𝑥 ∈ (𝐴 ∩ 𝐵)∀𝑢 ∈ 𝐴 ∀𝑣 ∈ 𝐵 ⟨“𝑢𝑥𝑣”⟩ ∈ (∟G‘𝐺))
33	25	adantr 480	. . 3 ⊢ ((𝜑 ∧ ∀𝑢 ∈ 𝐴 ∀𝑣 ∈ 𝐵 ⟨“𝑢𝑋𝑣”⟩ ∈ (∟G‘𝐺)) → (𝐴(⟂G‘𝐺)𝐵 ↔ ∃𝑥 ∈ (𝐴 ∩ 𝐵)∀𝑢 ∈ 𝐴 ∀𝑣 ∈ 𝐵 ⟨“𝑢𝑥𝑣”⟩ ∈ (∟G‘𝐺)))
34	32, 33	mpbird 257	. 2 ⊢ ((𝜑 ∧ ∀𝑢 ∈ 𝐴 ∀𝑣 ∈ 𝐵 ⟨“𝑢𝑋𝑣”⟩ ∈ (∟G‘𝐺)) → 𝐴(⟂G‘𝐺)𝐵)
35	27, 34	impbida 798	1 ⊢ (𝜑 → (𝐴(⟂G‘𝐺)𝐵 ↔ ∀𝑢 ∈ 𝐴 ∀𝑣 ∈ 𝐵 ⟨“𝑢𝑋𝑣”⟩ ∈ (∟G‘𝐺)))

Colors of variables: wff setvar class

Syntax hints: → wi 4 ↔ wb 205 ∧ wa 395 = wceq 1540 ∈ wcel 2105 ∀wral 3060 ∃wrex 3069 ∩ cin 3947 class class class wbr 5148 ran crn 5677 ‘cfv 6543 ⟨“cs3 14800 Basecbs 17151 distcds 17213 TarskiGcstrkg 28112 Itvcitv 28118 LineGclng 28119 ∟Gcrag 28378 ⟂Gcperpg 28380

This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1796 ax-4 1810 ax-5 1912 ax-6 1970 ax-7 2010 ax-8 2107 ax-9 2115 ax-10 2136 ax-11 2153 ax-12 2170 ax-ext 2702 ax-rep 5285 ax-sep 5299 ax-nul 5306 ax-pow 5363 ax-pr 5427 ax-un 7729 ax-cnex 11172 ax-resscn 11173 ax-1cn 11174 ax-icn 11175 ax-addcl 11176 ax-addrcl 11177 ax-mulcl 11178 ax-mulrcl 11179 ax-mulcom 11180 ax-addass 11181 ax-mulass 11182 ax-distr 11183 ax-i2m1 11184 ax-1ne0 11185 ax-1rid 11186 ax-rnegex 11187 ax-rrecex 11188 ax-cnre 11189 ax-pre-lttri 11190 ax-pre-lttrn 11191 ax-pre-ltadd 11192 ax-pre-mulgt0 11193

This theorem depends on definitions: df-bi 206 df-an 396 df-or 845 df-3or 1087 df-3an 1088 df-tru 1543 df-fal 1553 df-ex 1781 df-nf 1785 df-sb 2067 df-mo 2533 df-eu 2562 df-clab 2709 df-cleq 2723 df-clel 2809 df-nfc 2884 df-ne 2940 df-nel 3046 df-ral 3061 df-rex 3070 df-rmo 3375 df-reu 3376 df-rab 3432 df-v 3475 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-tp 4633 df-op 4635 df-uni 4909 df-int 4951 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 7368 df-ov 7415 df-oprab 7416 df-mpo 7417 df-om 7860 df-1st 7979 df-2nd 7980 df-frecs 8272 df-wrecs 8303 df-recs 8377 df-rdg 8416 df-1o 8472 df-oadd 8476 df-er 8709 df-map 8828 df-pm 8829 df-en 8946 df-dom 8947 df-sdom 8948 df-fin 8949 df-dju 9902 df-card 9940 df-pnf 11257 df-mnf 11258 df-xr 11259 df-ltxr 11260 df-le 11261 df-sub 11453 df-neg 11454 df-nn 12220 df-2 12282 df-3 12283 df-n0 12480 df-xnn0 12552 df-z 12566 df-uz 12830 df-fz 13492 df-fzo 13635 df-hash 14298 df-word 14472 df-concat 14528 df-s1 14553 df-s2 14806 df-s3 14807 df-trkgc 28133 df-trkgb 28134 df-trkgcb 28135 df-trkg 28138 df-cgrg 28196 df-mir 28338 df-rag 28379 df-perpg 28381

This theorem is referenced by: isperp2d 28401 ragperp 28402 foot 28407

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