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Theorem angmgm0g 29426

Description: The identity element of the angle addition magma. (Contributed by Thierry Arnoux, 31-Aug-2026.)

**Hypotheses**
Ref	Expression
angmgmval.p	⊢ 𝑃 = (Base‘𝐺)
angmgmval.a	⊢ 𝐴 = {𝑑 ∈ (𝑃 ↑_m (0..^3)) ∣ ((𝑑‘0) ≠ (𝑑‘1) ∧ (𝑑‘1) ≠ (𝑑‘2))}
angmgmval.i	⊢ 𝐼 = (Itv‘𝐺)
angmgmval.d	⊢ − = (dist‘𝐺)
angmgmval.c	⊢ ∼ = (cgrA‘𝐺)
angmgmval.l	⊢ 𝐿 = (LineG‘𝐺)
angmgmval.o	⊢ + = (𝑒 ∈ 𝐴, 𝑓 ∈ 𝐴 ↦ if((𝑒‘0) ∈ ((𝑒‘1)𝐿(𝑒‘2)), ⟨“(𝑓‘0)(𝑓‘1)(℩𝑠 ∈ 𝑃 (⟨“(𝑓‘2)(𝑓‘1)𝑠”⟩ ∼ 𝑒 ∧ ((𝑓‘1) − 𝑠) = ((𝑒‘1) − (𝑒‘0))))”⟩, ⟨“(𝑒‘0)(𝑒‘1)(℩𝑠 ∈ 𝑃 (⟨“(𝑒‘2)(𝑒‘1)𝑠”⟩ ∼ 𝑓 ∧ ((𝑒‘1) − 𝑠) = ((𝑓‘1) − (𝑓‘0)) ∧ (((𝑒‘1)𝐿(𝑒‘2)) ∩ (𝑠𝐼(𝑒‘0))) ≠ ∅))”⟩))
angmgmval.j	⊢ 𝐽 = (AngMgm‘𝐺)
angmgmlem.g	⊢ (𝜑 → 𝐺 ∈ TarskiG)
angmgmlem.x	⊢ (𝜑 → 𝑋 ∈ 𝑃)
angmgmlem.y	⊢ (𝜑 → 𝑌 ∈ (𝑃 ∖ {𝑋}))

**Assertion**
Ref	Expression
angmgm0g	⊢ (𝜑 → [⟨“𝑋𝑌𝑋”⟩] ∼ = (0_g‘𝐽))

Distinct variable groups: 𝐴,𝑒,𝑓,𝑠 𝑒,𝐺,𝑓,𝑠 𝑃,𝑑,𝑒,𝑓,𝑠 + ,𝑑,𝑒,𝑓,𝑠 − ,𝑑,𝑒,𝑓,𝑠 ∼ ,𝑑,𝑒,𝑓,𝑠 𝐴,𝑑 𝐺,𝑑 𝐼,𝑑,𝑒,𝑓,𝑠 𝑒,𝐽,𝑓 𝐿,𝑑,𝑒,𝑓,𝑠 𝑋,𝑑,𝑒,𝑓,𝑠 𝑌,𝑑,𝑒,𝑓,𝑠 𝜑,𝑑,𝑒,𝑓,𝑠 Allowed substitution hints: 𝐽(𝑠, 𝑑)

**Proof of Theorem angmgm0g**
Step	Hyp	Ref	Expression
1		angmgmval.p	. . 3 ⊢ 𝑃 = (Base‘𝐺)
2		angmgmval.a	. . 3 ⊢ 𝐴 = {𝑑 ∈ (𝑃 ↑_m (0..^3)) ∣ ((𝑑‘0) ≠ (𝑑‘1) ∧ (𝑑‘1) ≠ (𝑑‘2))}
3		angmgmval.i	. . 3 ⊢ 𝐼 = (Itv‘𝐺)
4		angmgmval.d	. . 3 ⊢ − = (dist‘𝐺)
5		angmgmval.c	. . 3 ⊢ ∼ = (cgrA‘𝐺)
6		angmgmval.l	. . 3 ⊢ 𝐿 = (LineG‘𝐺)
7		angmgmval.o	. . 3 ⊢ + = (𝑒 ∈ 𝐴, 𝑓 ∈ 𝐴 ↦ if((𝑒‘0) ∈ ((𝑒‘1)𝐿(𝑒‘2)), ⟨“(𝑓‘0)(𝑓‘1)(℩𝑠 ∈ 𝑃 (⟨“(𝑓‘2)(𝑓‘1)𝑠”⟩ ∼ 𝑒 ∧ ((𝑓‘1) − 𝑠) = ((𝑒‘1) − (𝑒‘0))))”⟩, ⟨“(𝑒‘0)(𝑒‘1)(℩𝑠 ∈ 𝑃 (⟨“(𝑒‘2)(𝑒‘1)𝑠”⟩ ∼ 𝑓 ∧ ((𝑒‘1) − 𝑠) = ((𝑓‘1) − (𝑓‘0)) ∧ (((𝑒‘1)𝐿(𝑒‘2)) ∩ (𝑠𝐼(𝑒‘0))) ≠ ∅))”⟩))
8		angmgmval.j	. . 3 ⊢ 𝐽 = (AngMgm‘𝐺)
9		angmgmlem.g	. . 3 ⊢ (𝜑 → 𝐺 ∈ TarskiG)
10		angmgmlem.x	. . 3 ⊢ (𝜑 → 𝑋 ∈ 𝑃)
11		angmgmlem.y	. . 3 ⊢ (𝜑 → 𝑌 ∈ (𝑃 ∖ {𝑋}))
12	1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11	angmgmlem 29425	. 2 ⊢ (𝜑 → (𝐽 ∈ Mgm ∧ [⟨“𝑋𝑌𝑋”⟩] ∼ = (0_g‘𝐽)))
13	12	simprd 501	1 ⊢ (𝜑 → [⟨“𝑋𝑌𝑋”⟩] ∼ = (0_g‘𝐽))

Colors of variables: wff setvar class

This proof depends on syntax axioms: → wi 4 ∧ wa 401 ∧ w3a 1103 = wceq 1570 ∈ wcel 2147 ≠ wne 2959 {crab 3416 ∖ cdif 4048 ∩ cin 4092 ∅c0 4281 ifcif 4485 {csn 4588 class class class wbr 5106 ‘cfv 6558 ℩crio 7399 (class class class)co 7443 ∈ cmpo 7445 [cec 8743 ↑_m cmap 8875 0cc0 11227 1c1 11228 2c2 12424 3c3 12425 ..^cfzo 13815 ⟨“cs3 15021 Basecbs 17416 distcds 17466 0_gc0g 17639 Mgmcmgm 18843 TarskiGcstrkg 28919 Itvcitv 28925 LineGclng 28926 cgrAccgra 29344 AngMgmcangmgm 29403

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-rep 5235 ax-sep 5252 ax-nul 5263 ax-pow 5331 ax-pr 5395 ax-un 7775 ax-cnex 11283 ax-resscn 11284 ax-1cn 11285 ax-icn 11286 ax-addcl 11287 ax-addrcl 11288 ax-mulcl 11289 ax-mulrcl 11290 ax-mulcom 11291 ax-addass 11292 ax-mulass 11293 ax-distr 11294 ax-i2m1 11295 ax-1ne0 11296 ax-1rid 11297 ax-rnegex 11298 ax-rrecex 11299 ax-cnre 11300 ax-pre-lttri 11301 ax-pre-lttrn 11302 ax-pre-ltadd 11303 ax-pre-mulgt0 11304

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-rmo 3369 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-tp 4593 df-op 4839 df-uni 4871 df-int 4911 df-iun 4956 df-br 5107 df-opab 5171 df-mpt 5190 df-tr 5216 df-id 5550 df-eprel 5555 df-po 5563 df-so 5564 df-fr 5608 df-we 5610 df-xp 5661 df-rel 5662 df-cnv 5663 df-co 5664 df-dm 5665 df-rn 5666 df-res 5667 df-ima 5668 df-pred 6322 df-ord 6383 df-on 6384 df-lim 6385 df-suc 6386 df-iota 6512 df-fun 6560 df-fn 6561 df-f 6562 df-f1 6563 df-fo 6564 df-f1o 6565 df-fv 6566 df-riota 7400 df-ov 7446 df-oprab 7447 df-mpo 7448 df-om 7902 df-1st 8025 df-2nd 8026 df-frecs 8327 df-wrecs 8358 df-recs 8407 df-rdg 8446 df-1o 8504 df-oadd 8508 df-er 8745 df-ec 8747 df-qs 8751 df-map 8877 df-pm 8878 df-en 9002 df-dom 9003 df-sdom 9004 df-fin 9005 df-sup 9461 df-inf 9462 df-dju 10009 df-card 10047 df-pnf 11372 df-mnf 11373 df-xr 11374 df-ltxr 11375 df-le 11376 df-sub 11570 df-neg 11571 df-nn 12363 df-2 12432 df-3 12433 df-4 12434 df-5 12435 df-6 12436 df-7 12437 df-8 12438 df-9 12439 df-n0 12634 df-xnn0 12707 df-z 12721 df-dec 12842 df-uz 12993 df-fz 13667 df-fzo 13816 df-hash 14502 df-word 14686 df-concat 14743 df-s1 14770 df-s2 15027 df-s3 15028 df-struct 17354 df-slot 17389 df-ndx 17401 df-base 17417 df-plusg 17470 df-mulr 17471 df-sca 17473 df-vsca 17474 df-ip 17475 df-tset 17476 df-ple 17477 df-ds 17479 df-0g 17641 df-imas 17709 df-qus 17710 df-mgm 18845 df-trkgc 28940 df-trkgb 28941 df-trkgcb 28942 df-trkgld 28944 df-trkg 28945 df-cgrg 29004 df-ismt 29026 df-leg 29076 df-hlg 29094 df-mir 29155 df-rag 29199 df-perpg 29201 df-hpg 29266 df-mid 29309 df-lmi 29310 df-cgra 29345 df-angmgm 29404

This theorem is used by: (None)

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