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Theorem isperp2 27956

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 2734	. . . . . . . . 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 731	. . . . . . . . . 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 731	. . . . . . . . . 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 731	. . . . . . . . . 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 783	. . . . . . . . . . 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 27955	. . . . . . . . . 10 ⊢ (((((𝜑 ∧ 𝐴(⟂G‘𝐺)𝐵) ∧ 𝑥 ∈ (𝐴 ∩ 𝐵)) ∧ 𝑢 ∈ 𝐴) ∧ 𝑣 ∈ 𝐵) → 𝐴 ≠ 𝐵)
14		simpllr 775	. . . . . . . . . 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 731	. . . . . . . . . 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 27884	. . . . . . . . 9 ⊢ (((((𝜑 ∧ 𝐴(⟂G‘𝐺)𝐵) ∧ 𝑥 ∈ (𝐴 ∩ 𝐵)) ∧ 𝑢 ∈ 𝐴) ∧ 𝑣 ∈ 𝐵) → 𝑥 = 𝑋)
18		eqidd 2734	. . . . . . . . 9 ⊢ (((((𝜑 ∧ 𝐴(⟂G‘𝐺)𝐵) ∧ 𝑥 ∈ (𝐴 ∩ 𝐵)) ∧ 𝑢 ∈ 𝐴) ∧ 𝑣 ∈ 𝐵) → 𝑣 = 𝑣)
19	1, 17, 18	s3eqd 14812	. . . . . . . 8 ⊢ (((((𝜑 ∧ 𝐴(⟂G‘𝐺)𝐵) ∧ 𝑥 ∈ (𝐴 ∩ 𝐵)) ∧ 𝑢 ∈ 𝐴) ∧ 𝑣 ∈ 𝐵) → ⟨“𝑢𝑥𝑣”⟩ = ⟨“𝑢𝑋𝑣”⟩)
20	19	eleq1d 2819	. . . . . . 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 3168	. . . . 5 ⊢ ((((𝜑 ∧ 𝐴(⟂G‘𝐺)𝐵) ∧ 𝑥 ∈ (𝐴 ∩ 𝐵)) ∧ 𝑢 ∈ 𝐴) → (∀𝑣 ∈ 𝐵 ⟨“𝑢𝑥𝑣”⟩ ∈ (∟G‘𝐺) → ∀𝑣 ∈ 𝐵 ⟨“𝑢𝑋𝑣”⟩ ∈ (∟G‘𝐺)))
23	22	ralimdva 3168	. . . 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 408	. . 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 27953	. . . 4 ⊢ (𝜑 → (𝐴(⟂G‘𝐺)𝐵 ↔ ∃𝑥 ∈ (𝐴 ∩ 𝐵)∀𝑢 ∈ 𝐴 ∀𝑣 ∈ 𝐵 ⟨“𝑢𝑥𝑣”⟩ ∈ (∟G‘𝐺)))
26	25	biimpa 478	. . 3 ⊢ ((𝜑 ∧ 𝐴(⟂G‘𝐺)𝐵) → ∃𝑥 ∈ (𝐴 ∩ 𝐵)∀𝑢 ∈ 𝐴 ∀𝑣 ∈ 𝐵 ⟨“𝑢𝑥𝑣”⟩ ∈ (∟G‘𝐺))
27	24, 26	r19.29a 3163	. 2 ⊢ ((𝜑 ∧ 𝐴(⟂G‘𝐺)𝐵) → ∀𝑢 ∈ 𝐴 ∀𝑣 ∈ 𝐵 ⟨“𝑢𝑋𝑣”⟩ ∈ (∟G‘𝐺))
28		s3eq2 14818	. . . . . . 7 ⊢ (𝑥 = 𝑋 → ⟨“𝑢𝑥𝑣”⟩ = ⟨“𝑢𝑋𝑣”⟩)
29	28	eleq1d 2819	. . . . . 6 ⊢ (𝑥 = 𝑋 → (⟨“𝑢𝑥𝑣”⟩ ∈ (∟G‘𝐺) ↔ ⟨“𝑢𝑋𝑣”⟩ ∈ (∟G‘𝐺)))
30	29	2ralbidv 3219	. . . . 5 ⊢ (𝑥 = 𝑋 → (∀𝑢 ∈ 𝐴 ∀𝑣 ∈ 𝐵 ⟨“𝑢𝑥𝑣”⟩ ∈ (∟G‘𝐺) ↔ ∀𝑢 ∈ 𝐴 ∀𝑣 ∈ 𝐵 ⟨“𝑢𝑋𝑣”⟩ ∈ (∟G‘𝐺)))
31	30	rspcev 3613	. . . 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 581	. . 3 ⊢ ((𝜑 ∧ ∀𝑢 ∈ 𝐴 ∀𝑣 ∈ 𝐵 ⟨“𝑢𝑋𝑣”⟩ ∈ (∟G‘𝐺)) → ∃𝑥 ∈ (𝐴 ∩ 𝐵)∀𝑢 ∈ 𝐴 ∀𝑣 ∈ 𝐵 ⟨“𝑢𝑥𝑣”⟩ ∈ (∟G‘𝐺))
33	25	adantr 482	. . 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 800	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 397 = wceq 1542 ∈ wcel 2107 ∀wral 3062 ∃wrex 3071 ∩ cin 3947 class class class wbr 5148 ran crn 5677 ‘cfv 6541 ⟨“cs3 14790 Basecbs 17141 distcds 17203 TarskiGcstrkg 27668 Itvcitv 27674 LineGclng 27675 ∟Gcrag 27934 ⟂Gcperpg 27936

This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1798 ax-4 1812 ax-5 1914 ax-6 1972 ax-7 2012 ax-8 2109 ax-9 2117 ax-10 2138 ax-11 2155 ax-12 2172 ax-ext 2704 ax-rep 5285 ax-sep 5299 ax-nul 5306 ax-pow 5363 ax-pr 5427 ax-un 7722 ax-cnex 11163 ax-resscn 11164 ax-1cn 11165 ax-icn 11166 ax-addcl 11167 ax-addrcl 11168 ax-mulcl 11169 ax-mulrcl 11170 ax-mulcom 11171 ax-addass 11172 ax-mulass 11173 ax-distr 11174 ax-i2m1 11175 ax-1ne0 11176 ax-1rid 11177 ax-rnegex 11178 ax-rrecex 11179 ax-cnre 11180 ax-pre-lttri 11181 ax-pre-lttrn 11182 ax-pre-ltadd 11183 ax-pre-mulgt0 11184

This theorem depends on definitions: df-bi 206 df-an 398 df-or 847 df-3or 1089 df-3an 1090 df-tru 1545 df-fal 1555 df-ex 1783 df-nf 1787 df-sb 2069 df-mo 2535 df-eu 2564 df-clab 2711 df-cleq 2725 df-clel 2811 df-nfc 2886 df-ne 2942 df-nel 3048 df-ral 3063 df-rex 3072 df-rmo 3377 df-reu 3378 df-rab 3434 df-v 3477 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 6298 df-ord 6365 df-on 6366 df-lim 6367 df-suc 6368 df-iota 6493 df-fun 6543 df-fn 6544 df-f 6545 df-f1 6546 df-fo 6547 df-f1o 6548 df-fv 6549 df-riota 7362 df-ov 7409 df-oprab 7410 df-mpo 7411 df-om 7853 df-1st 7972 df-2nd 7973 df-frecs 8263 df-wrecs 8294 df-recs 8368 df-rdg 8407 df-1o 8463 df-oadd 8467 df-er 8700 df-map 8819 df-pm 8820 df-en 8937 df-dom 8938 df-sdom 8939 df-fin 8940 df-dju 9893 df-card 9931 df-pnf 11247 df-mnf 11248 df-xr 11249 df-ltxr 11250 df-le 11251 df-sub 11443 df-neg 11444 df-nn 12210 df-2 12272 df-3 12273 df-n0 12470 df-xnn0 12542 df-z 12556 df-uz 12820 df-fz 13482 df-fzo 13625 df-hash 14288 df-word 14462 df-concat 14518 df-s1 14543 df-s2 14796 df-s3 14797 df-trkgc 27689 df-trkgb 27690 df-trkgcb 27691 df-trkg 27694 df-cgrg 27752 df-mir 27894 df-rag 27935 df-perpg 27937

This theorem is referenced by: isperp2d 27957 ragperp 27958 foot 27963

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