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| Mirrors > Home > ILE Home > Th. List > mndsgrp | GIF version | ||
| Description: A monoid is a semigroup. (Contributed by FL, 2-Nov-2009.) (Revised by AV, 6-Jan-2020.) (Proof shortened by AV, 6-Feb-2020.) |
| Ref | Expression |
|---|---|
| mndsgrp | ⊢ (𝐺 ∈ Mnd → 𝐺 ∈ Smgrp) |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | eqid 2230 | . . 3 ⊢ (Base‘𝐺) = (Base‘𝐺) | |
| 2 | eqid 2230 | . . 3 ⊢ (+g‘𝐺) = (+g‘𝐺) | |
| 3 | 1, 2 | ismnddef 13524 | . 2 ⊢ (𝐺 ∈ Mnd ↔ (𝐺 ∈ Smgrp ∧ ∃𝑒 ∈ (Base‘𝐺)∀𝑥 ∈ (Base‘𝐺)((𝑒(+g‘𝐺)𝑥) = 𝑥 ∧ (𝑥(+g‘𝐺)𝑒) = 𝑥))) |
| 4 | 3 | simplbi 274 | 1 ⊢ (𝐺 ∈ Mnd → 𝐺 ∈ Smgrp) |
| Colors of variables: wff set class |
| Syntax hints: → wi 4 ∧ wa 104 = wceq 1397 ∈ wcel 2201 ∀wral 2509 ∃wrex 2510 ‘cfv 5328 (class class class)co 6023 Basecbs 13105 +gcplusg 13183 Smgrpcsgrp 13507 Mndcmnd 13522 |
| This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-ia1 106 ax-ia2 107 ax-ia3 108 ax-io 716 ax-5 1495 ax-7 1496 ax-gen 1497 ax-ie1 1541 ax-ie2 1542 ax-8 1552 ax-10 1553 ax-11 1554 ax-i12 1555 ax-bndl 1557 ax-4 1558 ax-17 1574 ax-i9 1578 ax-ial 1582 ax-i5r 1583 ax-13 2203 ax-14 2204 ax-ext 2212 ax-sep 4208 ax-pow 4266 ax-pr 4301 ax-un 4532 ax-cnex 8128 ax-resscn 8129 ax-1re 8131 ax-addrcl 8134 |
| This theorem depends on definitions: df-bi 117 df-3an 1006 df-tru 1400 df-nf 1509 df-sb 1810 df-eu 2081 df-mo 2082 df-clab 2217 df-cleq 2223 df-clel 2226 df-nfc 2362 df-ral 2514 df-rex 2515 df-rab 2518 df-v 2803 df-sbc 3031 df-un 3203 df-in 3205 df-ss 3212 df-pw 3655 df-sn 3676 df-pr 3677 df-op 3679 df-uni 3895 df-int 3930 df-br 4090 df-opab 4152 df-mpt 4153 df-id 4392 df-xp 4733 df-rel 4734 df-cnv 4735 df-co 4736 df-dm 4737 df-rn 4738 df-res 4739 df-iota 5288 df-fun 5330 df-fn 5331 df-fv 5336 df-ov 6026 df-inn 9149 df-2 9207 df-ndx 13108 df-slot 13109 df-base 13111 df-plusg 13196 df-mnd 13523 |
| This theorem is referenced by: mndmgm 13528 mndass 13530 grpsgrp 13631 mulgnn0dir 13762 mulgnn0ass 13768 ringrng 14073 |
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