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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 2760 | . . 3 ⊢ (0g‘𝐺) = (0g‘𝐺) | |
| 3 | 1, 2 | grpidcl 19089 | . 2 ⊢ (𝐺 ∈ Grp → (0g‘𝐺) ∈ 𝐵) |
| 4 | 3 | ne0d 4288 | 1 ⊢ (𝐺 ∈ Grp → 𝐵 ≠ ∅) |
| Colors of variables: wff setvar class |
| This proof depends on syntax axioms: → wi 4 = wceq 1570 ∈ wcel 2145 ≠ wne 2955 ∅c0 4279 ‘cfv 6533 Basecbs 17301 0gc0g 17524 Grpcgrp 19057 |
| 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 2147 ax-9 2155 ax-10 2178 ax-11 2194 ax-12 2213 ax-ext 2732 ax-sep 5251 ax-nul 5263 ax-pr 5398 |
| 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 2564 df-eu 2594 df-clab 2739 df-cleq 2752 df-clel 2835 df-nfc 2909 df-ne 2956 df-ral 3077 df-rex 3087 df-rmo 3365 df-reu 3366 df-rab 3413 df-v 3452 df-sbc 3740 df-dif 3902 df-un 3904 df-in 3906 df-ss 3916 df-nul 4280 df-if 4483 df-sn 4585 df-pr 4587 df-op 4591 df-uni 4868 df-br 5104 df-opab 5168 df-mpt 5187 df-id 5550 df-xp 5661 df-rel 5662 df-cnv 5663 df-co 5664 df-dm 5665 df-iota 6489 df-fun 6535 df-fv 6541 df-riota 7370 df-ov 7416 df-0g 17526 df-mgm 18730 df-sgrp 18821 df-mnd 18837 df-grp 19060 |
| This theorem is used by: grpn0 19095 dfgrp3 19162 issubg2 19265 grpissubg 19270 qustriv 19309 ghmrn 19356 gexcl3 19714 gexcl2 19716 sylow1lem1 19725 sylow1lem3 19727 sylow1lem5 19729 pgpfi 19732 pgpfi2 19733 sylow2blem3 19749 slwhash 19751 fislw 19752 gexex 19980 lt6abl 20022 ablfac1lem 20197 ablfac1b 20199 ablfac1c 20200 ablfac1eu 20202 pgpfac1lem2 20204 pgpfac1lem3a 20205 ablfaclem3 20216 dvdsr02 20513 0ringnnzr 20686 lmodbn0 21055 lmodsn0 21058 rmodislmodlem 21113 rmodislmod 21114 islss3 21143 rnglidl1 21421 isclmp 25325 dfacbasgrp 43949 |
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