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Theorem ncoltgdim2 28655

Description: If there are three non-colinear points, then the dimension is at least two. Converse of tglowdim2l 28740. (Contributed by Thierry Arnoux, 23-Feb-2020.)

**Hypotheses**
Ref	Expression
tglngval.p	⊢ 𝑃 = (Base‘𝐺)
tglngval.l	⊢ 𝐿 = (LineG‘𝐺)
tglngval.i	⊢ 𝐼 = (Itv‘𝐺)
tglngval.g	⊢ (𝜑 → 𝐺 ∈ TarskiG)
tglngval.x	⊢ (𝜑 → 𝑋 ∈ 𝑃)
tglngval.y	⊢ (𝜑 → 𝑌 ∈ 𝑃)
tgcolg.z	⊢ (𝜑 → 𝑍 ∈ 𝑃)
ncoltgdim2.1	⊢ (𝜑 → ¬ (𝑍 ∈ (𝑋𝐿𝑌) ∨ 𝑋 = 𝑌))

**Assertion**
Ref	Expression
ncoltgdim2	⊢ (𝜑 → 𝐺Dim_TarskiG≥2)

**Proof of Theorem ncoltgdim2**
Step	Hyp	Ref	Expression
1		ncoltgdim2.1	. . 3 ⊢ (𝜑 → ¬ (𝑍 ∈ (𝑋𝐿𝑌) ∨ 𝑋 = 𝑌))
2		tglngval.p	. . . 4 ⊢ 𝑃 = (Base‘𝐺)
3		tglngval.l	. . . 4 ⊢ 𝐿 = (LineG‘𝐺)
4		tglngval.i	. . . 4 ⊢ 𝐼 = (Itv‘𝐺)
5		tglngval.g	. . . . 5 ⊢ (𝜑 → 𝐺 ∈ TarskiG)
6	5	adantr 482	. . . 4 ⊢ ((𝜑 ∧ ¬ 𝐺Dim_TarskiG≥2) → 𝐺 ∈ TarskiG)
7		tglngval.x	. . . . 5 ⊢ (𝜑 → 𝑋 ∈ 𝑃)
8	7	adantr 482	. . . 4 ⊢ ((𝜑 ∧ ¬ 𝐺Dim_TarskiG≥2) → 𝑋 ∈ 𝑃)
9		tglngval.y	. . . . 5 ⊢ (𝜑 → 𝑌 ∈ 𝑃)
10	9	adantr 482	. . . 4 ⊢ ((𝜑 ∧ ¬ 𝐺Dim_TarskiG≥2) → 𝑌 ∈ 𝑃)
11		tgcolg.z	. . . . 5 ⊢ (𝜑 → 𝑍 ∈ 𝑃)
12	11	adantr 482	. . . 4 ⊢ ((𝜑 ∧ ¬ 𝐺Dim_TarskiG≥2) → 𝑍 ∈ 𝑃)
13		simpr 486	. . . 4 ⊢ ((𝜑 ∧ ¬ 𝐺Dim_TarskiG≥2) → ¬ 𝐺Dim_TarskiG≥2)
14	2, 3, 4, 6, 8, 10, 12, 13	tgdim01ln 28654	. . 3 ⊢ ((𝜑 ∧ ¬ 𝐺Dim_TarskiG≥2) → (𝑍 ∈ (𝑋𝐿𝑌) ∨ 𝑋 = 𝑌))
15	1, 14	mtand 822	. 2 ⊢ (𝜑 → ¬ ¬ 𝐺Dim_TarskiG≥2)
16	15	notnotrd 133	1 ⊢ (𝜑 → 𝐺Dim_TarskiG≥2)

Colors of variables: wff setvar class

Syntax hints: ¬ wn 3 → wi 4 ∧ wa 397 ∨ wo 854 = wceq 1548 ∈ wcel 2121 class class class wbr 5075 ‘cfv 6489 (class class class)co 7360 2c2 12231 Basecbs 17174 TarskiGcstrkg 28517 Dim_TarskiG≥cstrkgld 28521 Itvcitv 28523 LineGclng 28524

This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1803 ax-4 1817 ax-5 1918 ax-6 1975 ax-7 2016 ax-8 2123 ax-9 2131 ax-10 2154 ax-11 2170 ax-12 2191 ax-ext 2713 ax-sep 5221 ax-nul 5231 ax-pow 5297 ax-pr 5365 ax-un 7682 ax-cnex 11089 ax-resscn 11090 ax-1cn 11091 ax-icn 11092 ax-addcl 11093 ax-addrcl 11094 ax-mulcl 11095 ax-mulrcl 11096 ax-mulcom 11097 ax-addass 11098 ax-mulass 11099 ax-distr 11100 ax-i2m1 11101 ax-1ne0 11102 ax-1rid 11103 ax-rnegex 11104 ax-rrecex 11105 ax-cnre 11106 ax-pre-lttri 11107 ax-pre-lttrn 11108 ax-pre-ltadd 11109 ax-pre-mulgt0 11110

This theorem depends on definitions: df-bi 209 df-an 398 df-or 855 df-3or 1094 df-3an 1095 df-tru 1551 df-fal 1561 df-ex 1788 df-nf 1792 df-sb 2075 df-mo 2545 df-eu 2575 df-clab 2720 df-cleq 2733 df-clel 2816 df-nfc 2890 df-ne 2937 df-nel 3041 df-ral 3056 df-rex 3066 df-reu 3347 df-rab 3394 df-v 3435 df-sbc 3726 df-csb 3834 df-dif 3888 df-un 3890 df-in 3892 df-ss 3902 df-pss 3905 df-nul 4265 df-if 4458 df-pw 4534 df-sn 4559 df-pr 4561 df-op 4565 df-uni 4842 df-iun 4926 df-br 5076 df-opab 5138 df-mpt 5157 df-tr 5183 df-id 5516 df-eprel 5521 df-po 5529 df-so 5530 df-fr 5574 df-we 5576 df-xp 5627 df-rel 5628 df-cnv 5629 df-co 5630 df-dm 5631 df-rn 5632 df-res 5633 df-ima 5634 df-pred 6256 df-ord 6317 df-on 6318 df-lim 6319 df-suc 6320 df-iota 6445 df-fun 6491 df-fn 6492 df-f 6493 df-f1 6494 df-fo 6495 df-f1o 6496 df-fv 6497 df-riota 7317 df-ov 7363 df-oprab 7364 df-mpo 7365 df-om 7811 df-1st 7935 df-2nd 7936 df-frecs 8225 df-wrecs 8256 df-recs 8305 df-rdg 8343 df-er 8637 df-en 8888 df-dom 8889 df-sdom 8890 df-pnf 11176 df-mnf 11177 df-xr 11178 df-ltxr 11179 df-le 11180 df-sub 11374 df-neg 11375 df-nn 12170 df-2 12239 df-n0 12433 df-z 12520 df-uz 12784 df-fz 13457 df-fzo 13604 df-trkgc 28538 df-trkgcb 28540 df-trkgld 28542 df-trkg 28543

This theorem is referenced by: opptgdim2 28835 trgcopy 28894 trgcopyeulem 28895 cgrg3col4 28943

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