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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 2735 | . . 3 ⊢ (0g‘𝐺) = (0g‘𝐺) | |
| 3 | 1, 2 | grpidcl 18948 | . 2 ⊢ (𝐺 ∈ Grp → (0g‘𝐺) ∈ 𝐵) |
| 4 | 3 | ne0d 4317 | 1 ⊢ (𝐺 ∈ Grp → 𝐵 ≠ ∅) |
| Colors of variables: wff setvar class |
| Syntax hints: → wi 4 = wceq 1540 ∈ wcel 2108 ≠ wne 2932 ∅c0 4308 ‘cfv 6531 Basecbs 17228 0gc0g 17453 Grpcgrp 18916 |
| This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1795 ax-4 1809 ax-5 1910 ax-6 1967 ax-7 2007 ax-8 2110 ax-9 2118 ax-10 2141 ax-11 2157 ax-12 2177 ax-ext 2707 ax-sep 5266 ax-nul 5276 ax-pr 5402 |
| This theorem depends on definitions: df-bi 207 df-an 396 df-or 848 df-3an 1088 df-tru 1543 df-fal 1553 df-ex 1780 df-nf 1784 df-sb 2065 df-mo 2539 df-eu 2568 df-clab 2714 df-cleq 2727 df-clel 2809 df-nfc 2885 df-ne 2933 df-ral 3052 df-rex 3061 df-rmo 3359 df-reu 3360 df-rab 3416 df-v 3461 df-sbc 3766 df-dif 3929 df-un 3931 df-ss 3943 df-nul 4309 df-if 4501 df-sn 4602 df-pr 4604 df-op 4608 df-uni 4884 df-br 5120 df-opab 5182 df-mpt 5202 df-id 5548 df-xp 5660 df-rel 5661 df-cnv 5662 df-co 5663 df-dm 5664 df-iota 6484 df-fun 6533 df-fv 6539 df-riota 7362 df-ov 7408 df-0g 17455 df-mgm 18618 df-sgrp 18697 df-mnd 18713 df-grp 18919 |
| This theorem is referenced by: grpn0 18954 dfgrp3 19022 issubg2 19124 grpissubg 19129 ghmrn 19212 gexcl3 19568 gexcl2 19570 sylow1lem1 19579 sylow1lem3 19581 sylow1lem5 19583 pgpfi 19586 pgpfi2 19587 sylow2blem3 19603 slwhash 19605 fislw 19606 gexex 19834 lt6abl 19876 ablfac1lem 20051 ablfac1b 20053 ablfac1c 20054 ablfac1eu 20056 pgpfac1lem2 20058 pgpfac1lem3a 20059 ablfaclem3 20070 dvdsr02 20332 0ringnnzr 20485 lmodbn0 20828 lmodsn0 20831 rmodislmodlem 20886 rmodislmod 20887 islss3 20916 rnglidl1 21193 isclmp 25048 qustriv 33379 dfacbasgrp 43132 |
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