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Mirrors > Home > MPE Home > Th. List > grpoidcl | Structured version Visualization version GIF version |
Description: The identity element of a group belongs to the group. (Contributed by NM, 24-Oct-2006.) (Revised by Mario Carneiro, 15-Dec-2013.) (New usage is discouraged.) |
Ref | Expression |
---|---|
grpoidval.1 | ⊢ 𝑋 = ran 𝐺 |
grpoidval.2 | ⊢ 𝑈 = (GId‘𝐺) |
Ref | Expression |
---|---|
grpoidcl | ⊢ (𝐺 ∈ GrpOp → 𝑈 ∈ 𝑋) |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | grpoidval.1 | . . 3 ⊢ 𝑋 = ran 𝐺 | |
2 | grpoidval.2 | . . 3 ⊢ 𝑈 = (GId‘𝐺) | |
3 | 1, 2 | grpoidval 28292 | . 2 ⊢ (𝐺 ∈ GrpOp → 𝑈 = (℩𝑢 ∈ 𝑋 ∀𝑥 ∈ 𝑋 (𝑢𝐺𝑥) = 𝑥)) |
4 | 1 | grpoideu 28288 | . . 3 ⊢ (𝐺 ∈ GrpOp → ∃!𝑢 ∈ 𝑋 ∀𝑥 ∈ 𝑋 (𝑢𝐺𝑥) = 𝑥) |
5 | riotacl 7133 | . . 3 ⊢ (∃!𝑢 ∈ 𝑋 ∀𝑥 ∈ 𝑋 (𝑢𝐺𝑥) = 𝑥 → (℩𝑢 ∈ 𝑋 ∀𝑥 ∈ 𝑋 (𝑢𝐺𝑥) = 𝑥) ∈ 𝑋) | |
6 | 4, 5 | syl 17 | . 2 ⊢ (𝐺 ∈ GrpOp → (℩𝑢 ∈ 𝑋 ∀𝑥 ∈ 𝑋 (𝑢𝐺𝑥) = 𝑥) ∈ 𝑋) |
7 | 3, 6 | eqeltrd 2915 | 1 ⊢ (𝐺 ∈ GrpOp → 𝑈 ∈ 𝑋) |
Colors of variables: wff setvar class |
Syntax hints: → wi 4 = wceq 1537 ∈ wcel 2114 ∀wral 3140 ∃!wreu 3142 ran crn 5558 ‘cfv 6357 ℩crio 7115 (class class class)co 7158 GrpOpcgr 28268 GIdcgi 28269 |
This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1796 ax-4 1810 ax-5 1911 ax-6 1970 ax-7 2015 ax-8 2116 ax-9 2124 ax-10 2145 ax-11 2161 ax-12 2177 ax-ext 2795 ax-sep 5205 ax-nul 5212 ax-pr 5332 ax-un 7463 |
This theorem depends on definitions: df-bi 209 df-an 399 df-or 844 df-3an 1085 df-tru 1540 df-ex 1781 df-nf 1785 df-sb 2070 df-mo 2622 df-eu 2654 df-clab 2802 df-cleq 2816 df-clel 2895 df-nfc 2965 df-ral 3145 df-rex 3146 df-reu 3147 df-rab 3149 df-v 3498 df-sbc 3775 df-csb 3886 df-dif 3941 df-un 3943 df-in 3945 df-ss 3954 df-nul 4294 df-if 4470 df-sn 4570 df-pr 4572 df-op 4576 df-uni 4841 df-iun 4923 df-br 5069 df-opab 5131 df-mpt 5149 df-id 5462 df-xp 5563 df-rel 5564 df-cnv 5565 df-co 5566 df-dm 5567 df-rn 5568 df-iota 6316 df-fun 6359 df-fn 6360 df-f 6361 df-fo 6363 df-fv 6365 df-riota 7116 df-ov 7161 df-grpo 28272 df-gid 28273 |
This theorem is referenced by: grpoid 28299 vczcl 28351 nvzcl 28413 ghomidOLD 35169 grpokerinj 35173 rngo0cl 35199 rngolz 35202 rngorz 35203 gidsn 35232 keridl 35312 |
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