Metamath Proof Explorer |
< Previous
Next >
Nearby theorems |
||
Mirrors > Home > MPE Home > Th. List > grpolid | Structured version Visualization version GIF version |
Description: The identity element of a group is a left identity. (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 |
---|---|
grpolid | ⊢ ((𝐺 ∈ GrpOp ∧ 𝐴 ∈ 𝑋) → (𝑈𝐺𝐴) = 𝐴) |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | grpoidval.1 | . . 3 ⊢ 𝑋 = ran 𝐺 | |
2 | grpoidval.2 | . . 3 ⊢ 𝑈 = (GId‘𝐺) | |
3 | 1, 2 | grpoidinv2 28294 | . 2 ⊢ ((𝐺 ∈ GrpOp ∧ 𝐴 ∈ 𝑋) → (((𝑈𝐺𝐴) = 𝐴 ∧ (𝐴𝐺𝑈) = 𝐴) ∧ ∃𝑦 ∈ 𝑋 ((𝑦𝐺𝐴) = 𝑈 ∧ (𝐴𝐺𝑦) = 𝑈))) |
4 | 3 | simplld 766 | 1 ⊢ ((𝐺 ∈ GrpOp ∧ 𝐴 ∈ 𝑋) → (𝑈𝐺𝐴) = 𝐴) |
Colors of variables: wff setvar class |
Syntax hints: → wi 4 ∧ wa 398 = wceq 1537 ∈ wcel 2114 ∃wrex 3141 ran crn 5558 ‘cfv 6357 (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 grpoinvid1 28307 grpoinvid2 28308 grpolcan 28309 grpoinvop 28312 ablonncan 28335 vcm 28355 nv0lid 28415 hhssabloilem 29040 grpoeqdivid 35161 ghomidOLD 35169 rngo0lid 35201 rngolz 35202 rngorz 35203 keridl 35312 |
Copyright terms: Public domain | W3C validator |