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Theorem tglowdim2l 29176

Description: Reformulation of the lower dimension axiom for dimension two. There exist three non-colinear points. Theorem 6.24 of [Schwabhauser] p. 46. (Contributed by Thierry Arnoux, 30-May-2019.)

**Hypotheses**
Ref	Expression
tglineintmo.p	⊢ 𝑃 = (Base‘𝐺)
tglineintmo.i	⊢ 𝐼 = (Itv‘𝐺)
tglineintmo.l	⊢ 𝐿 = (LineG‘𝐺)
tglineintmo.g	⊢ (𝜑 → 𝐺 ∈ TarskiG)
tglowdim2l.1	⊢ (𝜑 → 𝐺Dim_TarskiG≥2)

**Assertion**
Ref	Expression
tglowdim2l	⊢ (𝜑 → ∃𝑎 ∈ 𝑃 ∃𝑏 ∈ 𝑃 ∃𝑐 ∈ 𝑃 ¬ (𝑐 ∈ (𝑎𝐿𝑏) ∨ 𝑎 = 𝑏))

Distinct variable groups: 𝑎,𝑏,𝑐,𝐺 𝐼,𝑎,𝑏,𝑐 𝑃,𝑎,𝑏,𝑐 𝜑,𝑎,𝑏,𝑐 Allowed substitution hints: 𝐿(𝑎, 𝑏, 𝑐)

**Proof of Theorem tglowdim2l**
Step	Hyp	Ref	Expression
1		tglineintmo.p	. . 3 ⊢ 𝑃 = (Base‘𝐺)
2		eqid 2763	. . 3 ⊢ (dist‘𝐺) = (dist‘𝐺)
3		tglineintmo.i	. . 3 ⊢ 𝐼 = (Itv‘𝐺)
4		tglineintmo.g	. . 3 ⊢ (𝜑 → 𝐺 ∈ TarskiG)
5		tglowdim2l.1	. . 3 ⊢ (𝜑 → 𝐺Dim_TarskiG≥2)
6	1, 2, 3, 4, 5	axtglowdim2 28989	. 2 ⊢ (𝜑 → ∃𝑎 ∈ 𝑃 ∃𝑏 ∈ 𝑃 ∃𝑐 ∈ 𝑃 ¬ (𝑐 ∈ (𝑎𝐼𝑏) ∨ 𝑎 ∈ (𝑐𝐼𝑏) ∨ 𝑏 ∈ (𝑎𝐼𝑐)))
7		tglineintmo.l	. . . . . . 7 ⊢ 𝐿 = (LineG‘𝐺)
8	4	ad3antrrr 743	. . . . . . 7 ⊢ ((((𝜑 ∧ 𝑎 ∈ 𝑃) ∧ 𝑏 ∈ 𝑃) ∧ 𝑐 ∈ 𝑃) → 𝐺 ∈ TarskiG)
9		simpllr 788	. . . . . . 7 ⊢ ((((𝜑 ∧ 𝑎 ∈ 𝑃) ∧ 𝑏 ∈ 𝑃) ∧ 𝑐 ∈ 𝑃) → 𝑎 ∈ 𝑃)
10		simplr 781	. . . . . . 7 ⊢ ((((𝜑 ∧ 𝑎 ∈ 𝑃) ∧ 𝑏 ∈ 𝑃) ∧ 𝑐 ∈ 𝑃) → 𝑏 ∈ 𝑃)
11		simpr 490	. . . . . . 7 ⊢ ((((𝜑 ∧ 𝑎 ∈ 𝑃) ∧ 𝑏 ∈ 𝑃) ∧ 𝑐 ∈ 𝑃) → 𝑐 ∈ 𝑃)
12	1, 7, 3, 8, 9, 10, 11	tgcolg 29074	. . . . . 6 ⊢ ((((𝜑 ∧ 𝑎 ∈ 𝑃) ∧ 𝑏 ∈ 𝑃) ∧ 𝑐 ∈ 𝑃) → ((𝑐 ∈ (𝑎𝐿𝑏) ∨ 𝑎 = 𝑏) ↔ (𝑐 ∈ (𝑎𝐼𝑏) ∨ 𝑎 ∈ (𝑐𝐼𝑏) ∨ 𝑏 ∈ (𝑎𝐼𝑐))))
13	12	notbid 321	. . . . 5 ⊢ ((((𝜑 ∧ 𝑎 ∈ 𝑃) ∧ 𝑏 ∈ 𝑃) ∧ 𝑐 ∈ 𝑃) → (¬ (𝑐 ∈ (𝑎𝐿𝑏) ∨ 𝑎 = 𝑏) ↔ ¬ (𝑐 ∈ (𝑎𝐼𝑏) ∨ 𝑎 ∈ (𝑐𝐼𝑏) ∨ 𝑏 ∈ (𝑎𝐼𝑐))))
14	13	rexbidva 3188	. . . 4 ⊢ (((𝜑 ∧ 𝑎 ∈ 𝑃) ∧ 𝑏 ∈ 𝑃) → (∃𝑐 ∈ 𝑃 ¬ (𝑐 ∈ (𝑎𝐿𝑏) ∨ 𝑎 = 𝑏) ↔ ∃𝑐 ∈ 𝑃 ¬ (𝑐 ∈ (𝑎𝐼𝑏) ∨ 𝑎 ∈ (𝑐𝐼𝑏) ∨ 𝑏 ∈ (𝑎𝐼𝑐))))
15	14	rexbidva 3188	. . 3 ⊢ ((𝜑 ∧ 𝑎 ∈ 𝑃) → (∃𝑏 ∈ 𝑃 ∃𝑐 ∈ 𝑃 ¬ (𝑐 ∈ (𝑎𝐿𝑏) ∨ 𝑎 = 𝑏) ↔ ∃𝑏 ∈ 𝑃 ∃𝑐 ∈ 𝑃 ¬ (𝑐 ∈ (𝑎𝐼𝑏) ∨ 𝑎 ∈ (𝑐𝐼𝑏) ∨ 𝑏 ∈ (𝑎𝐼𝑐))))
16	15	rexbidva 3188	. 2 ⊢ (𝜑 → (∃𝑎 ∈ 𝑃 ∃𝑏 ∈ 𝑃 ∃𝑐 ∈ 𝑃 ¬ (𝑐 ∈ (𝑎𝐿𝑏) ∨ 𝑎 = 𝑏) ↔ ∃𝑎 ∈ 𝑃 ∃𝑏 ∈ 𝑃 ∃𝑐 ∈ 𝑃 ¬ (𝑐 ∈ (𝑎𝐼𝑏) ∨ 𝑎 ∈ (𝑐𝐼𝑏) ∨ 𝑏 ∈ (𝑎𝐼𝑐))))
17	6, 16	mpbird 260	1 ⊢ (𝜑 → ∃𝑎 ∈ 𝑃 ∃𝑏 ∈ 𝑃 ∃𝑐 ∈ 𝑃 ¬ (𝑐 ∈ (𝑎𝐿𝑏) ∨ 𝑎 = 𝑏))

Colors of variables: wff setvar class

This proof depends on syntax axioms: ¬ wn 3 → wi 4 ∧ wa 401 ∨ wo 861 ∨ w3o 1102 = wceq 1570 ∈ wcel 2147 ∃wrex 3090 class class class wbr 5108 ‘cfv 6566 (class class class)co 7451 2c2 12437 Basecbs 17431 distcds 17481 TarskiGcstrkg 28946 Dim_TarskiG≥cstrkgld 28950 Itvcitv 28952 LineGclng 28953

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 1945 ax-6 2002 ax-7 2043 ax-8 2149 ax-9 2157 ax-10 2180 ax-11 2197 ax-12 2216 ax-ext 2735 ax-sep 5255 ax-nul 5266 ax-pow 5334 ax-pr 5398 ax-un 7783 ax-cnex 11295 ax-resscn 11296 ax-1cn 11297 ax-icn 11298 ax-addcl 11299 ax-addrcl 11300 ax-mulcl 11301 ax-mulrcl 11302 ax-mulcom 11303 ax-addass 11304 ax-mulass 11305 ax-distr 11306 ax-i2m1 11307 ax-1ne0 11308 ax-1rid 11309 ax-rnegex 11310 ax-rrecex 11311 ax-cnre 11312 ax-pre-lttri 11313 ax-pre-lttrn 11314 ax-pre-ltadd 11315 ax-pre-mulgt0 11316

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 2102 df-mo 2567 df-eu 2597 df-clab 2742 df-cleq 2755 df-clel 2839 df-nfc 2913 df-ne 2960 df-nel 3066 df-ral 3081 df-rex 3091 df-reu 3370 df-rab 3417 df-v 3456 df-sbc 3743 df-csb 3852 df-ss 3901 df-pss 4017 df-dif 4050 df-in 4094 df-un 4154 df-nul 4282 df-if 4486 df-pw 4562 df-sn 4589 df-pr 4591 df-op 4841 df-uni 4873 df-iun 4958 df-br 5109 df-opab 5174 df-mpt 5193 df-tr 5219 df-id 5553 df-eprel 5558 df-po 5566 df-so 5567 df-fr 5611 df-we 5613 df-xp 5664 df-rel 5665 df-cnv 5666 df-co 5667 df-dm 5668 df-rn 5669 df-res 5670 df-ima 5671 df-pred 6330 df-ord 6391 df-on 6392 df-lim 6393 df-suc 6394 df-iota 6520 df-fun 6568 df-fn 6569 df-f 6570 df-f1 6571 df-fo 6572 df-f1o 6573 df-fv 6574 df-riota 7408 df-ov 7454 df-oprab 7455 df-mpo 7456 df-om 7912 df-1st 8035 df-2nd 8036 df-frecs 8337 df-wrecs 8368 df-recs 8417 df-rdg 8456 df-er 8755 df-en 9012 df-dom 9013 df-sdom 9014 df-pnf 11384 df-mnf 11385 df-xr 11386 df-ltxr 11387 df-le 11388 df-sub 11582 df-neg 11583 df-nn 12376 df-2 12445 df-n0 12647 df-z 12734 df-uz 13006 df-fz 13680 df-fzo 13829 df-trkgc 28967 df-trkgcb 28969 df-trkgld 28971 df-trkg 28972

This theorem is used by: tglowdim2ln 29177

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