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Theorem ttgelitv 28951

Description: Betweenness for a subcomplex Hilbert space augmented with betweenness. (Contributed by Thierry Arnoux, 25-Mar-2019.)

**Hypotheses**
Ref	Expression
ttgval.n	⊢ 𝐺 = (toTG‘𝐻)
ttgitvval.i	⊢ 𝐼 = (Itv‘𝐺)
ttgitvval.b	⊢ 𝑃 = (Base‘𝐻)
ttgitvval.m	⊢ − = (-_g‘𝐻)
ttgitvval.s	⊢ · = ( ·_𝑠 ‘𝐻)
ttgelitv.x	⊢ (𝜑 → 𝑋 ∈ 𝑃)
ttgelitv.y	⊢ (𝜑 → 𝑌 ∈ 𝑃)
ttgelitv.h	⊢ (𝜑 → 𝐻 ∈ 𝑉)
ttgelitv.z	⊢ (𝜑 → 𝑍 ∈ 𝑃)

**Assertion**
Ref	Expression
ttgelitv	⊢ (𝜑 → (𝑍 ∈ (𝑋𝐼𝑌) ↔ ∃𝑘 ∈ (0[,]1)(𝑍 − 𝑋) = (𝑘 · (𝑌 − 𝑋))))

Distinct variable groups: − ,𝑘 𝑘,𝐻 𝑃,𝑘 𝑘,𝑉 𝑘,𝑋 𝑘,𝑌 𝑘,𝑍 Allowed substitution hints: 𝜑(𝑘) · (𝑘) 𝐺(𝑘) 𝐼(𝑘)

Proof of Theorem ttgelitv Dummy variable 𝑧 is distinct from all other variables.

Step	Hyp	Ref	Expression
1		ttgelitv.z	. 2 ⊢ (𝜑 → 𝑍 ∈ 𝑃)
2		ttgelitv.h	. . . . 5 ⊢ (𝜑 → 𝐻 ∈ 𝑉)
3		ttgelitv.x	. . . . 5 ⊢ (𝜑 → 𝑋 ∈ 𝑃)
4		ttgelitv.y	. . . . 5 ⊢ (𝜑 → 𝑌 ∈ 𝑃)
5		ttgval.n	. . . . . 6 ⊢ 𝐺 = (toTG‘𝐻)
6		ttgitvval.i	. . . . . 6 ⊢ 𝐼 = (Itv‘𝐺)
7		ttgitvval.b	. . . . . 6 ⊢ 𝑃 = (Base‘𝐻)
8		ttgitvval.m	. . . . . 6 ⊢ − = (-_g‘𝐻)
9		ttgitvval.s	. . . . . 6 ⊢ · = ( ·_𝑠 ‘𝐻)
10	5, 6, 7, 8, 9	ttgitvval 28950	. . . . 5 ⊢ ((𝐻 ∈ 𝑉 ∧ 𝑋 ∈ 𝑃 ∧ 𝑌 ∈ 𝑃) → (𝑋𝐼𝑌) = {𝑧 ∈ 𝑃 ∣ ∃𝑘 ∈ (0[,]1)(𝑧 − 𝑋) = (𝑘 · (𝑌 − 𝑋))})
11	2, 3, 4, 10	syl3anc 1374	. . . 4 ⊢ (𝜑 → (𝑋𝐼𝑌) = {𝑧 ∈ 𝑃 ∣ ∃𝑘 ∈ (0[,]1)(𝑧 − 𝑋) = (𝑘 · (𝑌 − 𝑋))})
12	11	eleq2d 2822	. . 3 ⊢ (𝜑 → (𝑍 ∈ (𝑋𝐼𝑌) ↔ 𝑍 ∈ {𝑧 ∈ 𝑃 ∣ ∃𝑘 ∈ (0[,]1)(𝑧 − 𝑋) = (𝑘 · (𝑌 − 𝑋))}))
13		oveq1 7374	. . . . . 6 ⊢ (𝑧 = 𝑍 → (𝑧 − 𝑋) = (𝑍 − 𝑋))
14	13	eqeq1d 2738	. . . . 5 ⊢ (𝑧 = 𝑍 → ((𝑧 − 𝑋) = (𝑘 · (𝑌 − 𝑋)) ↔ (𝑍 − 𝑋) = (𝑘 · (𝑌 − 𝑋))))
15	14	rexbidv 3161	. . . 4 ⊢ (𝑧 = 𝑍 → (∃𝑘 ∈ (0[,]1)(𝑧 − 𝑋) = (𝑘 · (𝑌 − 𝑋)) ↔ ∃𝑘 ∈ (0[,]1)(𝑍 − 𝑋) = (𝑘 · (𝑌 − 𝑋))))
16	15	elrab 3634	. . 3 ⊢ (𝑍 ∈ {𝑧 ∈ 𝑃 ∣ ∃𝑘 ∈ (0[,]1)(𝑧 − 𝑋) = (𝑘 · (𝑌 − 𝑋))} ↔ (𝑍 ∈ 𝑃 ∧ ∃𝑘 ∈ (0[,]1)(𝑍 − 𝑋) = (𝑘 · (𝑌 − 𝑋))))
17	12, 16	bitrdi 287	. 2 ⊢ (𝜑 → (𝑍 ∈ (𝑋𝐼𝑌) ↔ (𝑍 ∈ 𝑃 ∧ ∃𝑘 ∈ (0[,]1)(𝑍 − 𝑋) = (𝑘 · (𝑌 − 𝑋)))))
18	1, 17	mpbirand 708	1 ⊢ (𝜑 → (𝑍 ∈ (𝑋𝐼𝑌) ↔ ∃𝑘 ∈ (0[,]1)(𝑍 − 𝑋) = (𝑘 · (𝑌 − 𝑋))))

Colors of variables: wff setvar class

Syntax hints: → wi 4 ↔ wb 206 ∧ wa 395 = wceq 1542 ∈ wcel 2114 ∃wrex 3061 {crab 3389 ‘cfv 6498 (class class class)co 7367 0cc0 11038 1c1 11039 [,]cicc 13301 Basecbs 17179 ·_𝑠 cvsca 17224 -_gcsg 18911 Itvcitv 28501 toTGcttg 28941

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 1912 ax-6 1969 ax-7 2010 ax-8 2116 ax-9 2124 ax-10 2147 ax-11 2163 ax-12 2185 ax-ext 2708 ax-rep 5212 ax-sep 5231 ax-nul 5241 ax-pow 5307 ax-pr 5375 ax-un 7689 ax-cnex 11094 ax-resscn 11095 ax-1cn 11096 ax-icn 11097 ax-addcl 11098 ax-addrcl 11099 ax-mulcl 11100 ax-mulrcl 11101 ax-mulcom 11102 ax-addass 11103 ax-mulass 11104 ax-distr 11105 ax-i2m1 11106 ax-1ne0 11107 ax-1rid 11108 ax-rnegex 11109 ax-rrecex 11110 ax-cnre 11111 ax-pre-lttri 11112 ax-pre-lttrn 11113 ax-pre-ltadd 11114 ax-pre-mulgt0 11115

This theorem depends on definitions: df-bi 207 df-an 396 df-or 849 df-3or 1088 df-3an 1089 df-tru 1545 df-fal 1555 df-ex 1782 df-nf 1786 df-sb 2069 df-mo 2539 df-eu 2569 df-clab 2715 df-cleq 2728 df-clel 2811 df-nfc 2885 df-ne 2933 df-nel 3037 df-ral 3052 df-rex 3062 df-reu 3343 df-rab 3390 df-v 3431 df-sbc 3729 df-csb 3838 df-dif 3892 df-un 3894 df-in 3896 df-ss 3906 df-pss 3909 df-nul 4274 df-if 4467 df-pw 4543 df-sn 4568 df-pr 4570 df-op 4574 df-uni 4851 df-iun 4935 df-br 5086 df-opab 5148 df-mpt 5167 df-tr 5193 df-id 5526 df-eprel 5531 df-po 5539 df-so 5540 df-fr 5584 df-we 5586 df-xp 5637 df-rel 5638 df-cnv 5639 df-co 5640 df-dm 5641 df-rn 5642 df-res 5643 df-ima 5644 df-pred 6265 df-ord 6326 df-on 6327 df-lim 6328 df-suc 6329 df-iota 6454 df-fun 6500 df-fn 6501 df-f 6502 df-f1 6503 df-fo 6504 df-f1o 6505 df-fv 6506 df-riota 7324 df-ov 7370 df-oprab 7371 df-mpo 7372 df-om 7818 df-1st 7942 df-2nd 7943 df-frecs 8231 df-wrecs 8262 df-recs 8311 df-rdg 8349 df-er 8643 df-en 8894 df-dom 8895 df-sdom 8896 df-pnf 11181 df-mnf 11182 df-xr 11183 df-ltxr 11184 df-le 11185 df-sub 11379 df-neg 11380 df-nn 12175 df-2 12244 df-3 12245 df-4 12246 df-5 12247 df-6 12248 df-7 12249 df-8 12250 df-9 12251 df-n0 12438 df-dec 12645 df-sets 17134 df-slot 17152 df-ndx 17164 df-itv 28503 df-lng 28504 df-ttg 28942

This theorem is referenced by: ttgbtwnid 28952 ttgcontlem1 28953

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