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| Mirrors > Home > MPE Home > Th. List > grpbn0 | Structured version Visualization version GIF version | ||
| Description: The base set of a group is not empty. (Contributed by Szymon Jaroszewicz, 3-Apr-2007.) |
| Ref | Expression |
|---|---|
| grpbn0.b | ⊢ 𝐵 = (Base‘𝐺) |
| Ref | Expression |
|---|---|
| grpbn0 | ⊢ (𝐺 ∈ Grp → 𝐵 ≠ ∅) |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | grpbn0.b | . . 3 ⊢ 𝐵 = (Base‘𝐺) | |
| 2 | eqid 2765 | . . 3 ⊢ (0g‘𝐺) = (0g‘𝐺) | |
| 3 | 1, 2 | grpidcl 19055 | . 2 ⊢ (𝐺 ∈ Grp → (0g‘𝐺) ∈ 𝐵) |
| 4 | 3 | ne0d 4295 | 1 ⊢ (𝐺 ∈ Grp → 𝐵 ≠ ∅) |
| Colors of variables: wff setvar class |
| This proof depends on syntax axioms: → wi 4 = wceq 1570 ∈ wcel 2146 ≠ wne 2960 ∅c0 4286 ‘cfv 6540 Basecbs 17286 0gc0g 17509 Grpcgrp 19023 |
| 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 1943 ax-6 2000 ax-7 2041 ax-8 2148 ax-9 2156 ax-10 2179 ax-11 2195 ax-12 2216 ax-ext 2737 ax-sep 5259 ax-nul 5271 ax-pr 5406 |
| This proof depends on definitions: df-bi 210 df-an 402 df-or 862 df-3an 1105 df-tru 1573 df-fal 1583 df-ex 1813 df-nf 1817 df-sb 2100 df-mo 2569 df-eu 2599 df-clab 2744 df-cleq 2757 df-clel 2840 df-nfc 2914 df-ne 2961 df-ral 3082 df-rex 3092 df-rmo 3371 df-reu 3372 df-rab 3419 df-v 3459 df-sbc 3747 df-dif 3909 df-un 3911 df-in 3913 df-ss 3923 df-nul 4287 df-if 4490 df-sn 4592 df-pr 4594 df-op 4598 df-uni 4875 df-br 5112 df-opab 5176 df-mpt 5195 df-id 5558 df-xp 5669 df-rel 5670 df-cnv 5671 df-co 5672 df-dm 5673 df-iota 6496 df-fun 6542 df-fv 6548 df-riota 7373 df-ov 7419 df-0g 17511 df-mgm 18715 df-sgrp 18798 df-mnd 18814 df-grp 19026 |
| This theorem is used by: grpn0 19061 dfgrp3 19128 issubg2 19231 grpissubg 19236 qustriv 19275 ghmrn 19322 gexcl3 19680 gexcl2 19682 sylow1lem1 19691 sylow1lem3 19693 sylow1lem5 19695 pgpfi 19698 pgpfi2 19699 sylow2blem3 19715 slwhash 19717 fislw 19718 gexex 19946 lt6abl 19988 ablfac1lem 20163 ablfac1b 20165 ablfac1c 20166 ablfac1eu 20168 pgpfac1lem2 20170 pgpfac1lem3a 20171 ablfaclem3 20182 dvdsr02 20479 0ringnnzr 20652 lmodbn0 21021 lmodsn0 21024 rmodislmodlem 21079 rmodislmod 21080 islss3 21109 rnglidl1 21387 isclmp 25285 dfacbasgrp 43868 |
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