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| Mirrors > Home > MPE Home > Th. List > mgm0b | Structured version Visualization version GIF version | ||
| Description: The structure with an empty base set and any group operation is a magma. (Contributed by AV, 28-Aug-2021.) |
| Ref | Expression |
|---|---|
| mgm0b | ⊢ {〈(Base‘ndx), ∅〉, 〈(+g‘ndx), 𝑂〉} ∈ Mgm |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | prex 5395 | . 2 ⊢ {〈(Base‘ndx), ∅〉, 〈(+g‘ndx), 𝑂〉} ∈ V | |
| 2 | 0ex 5257 | . . 3 ⊢ ∅ ∈ V | |
| 3 | eqid 2762 | . . . . 5 ⊢ {〈(Base‘ndx), ∅〉, 〈(+g‘ndx), 𝑂〉} = {〈(Base‘ndx), ∅〉, 〈(+g‘ndx), 𝑂〉} | |
| 4 | 3 | grpbase 17318 | . . . 4 ⊢ (∅ ∈ V → ∅ = (Base‘{〈(Base‘ndx), ∅〉, 〈(+g‘ndx), 𝑂〉})) |
| 5 | 4 | eqcomd 2768 | . . 3 ⊢ (∅ ∈ V → (Base‘{〈(Base‘ndx), ∅〉, 〈(+g‘ndx), 𝑂〉}) = ∅) |
| 6 | 2, 5 | ax-mp 5 | . 2 ⊢ (Base‘{〈(Base‘ndx), ∅〉, 〈(+g‘ndx), 𝑂〉}) = ∅ |
| 7 | mgm0 18690 | . 2 ⊢ (({〈(Base‘ndx), ∅〉, 〈(+g‘ndx), 𝑂〉} ∈ V ∧ (Base‘{〈(Base‘ndx), ∅〉, 〈(+g‘ndx), 𝑂〉}) = ∅) → {〈(Base‘ndx), ∅〉, 〈(+g‘ndx), 𝑂〉} ∈ Mgm) | |
| 8 | 1, 6, 7 | mp2an 702 | 1 ⊢ {〈(Base‘ndx), ∅〉, 〈(+g‘ndx), 𝑂〉} ∈ Mgm |
| Colors of variables: wff setvar class |
| Syntax hints: = wceq 1560 ∈ wcel 2142 Vcvv 3454 ∅c0 4285 {cpr 4584 〈cop 4588 ‘cfv 6521 ndxcnx 17229 Basecbs 17245 +gcplusg 17286 Mgmcmgm 18672 |
| This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1815 ax-4 1829 ax-5 1930 ax-6 1987 ax-7 2028 ax-8 2144 ax-9 2152 ax-10 2175 ax-11 2191 ax-12 2212 ax-ext 2734 ax-sep 5246 ax-nul 5256 ax-pow 5322 ax-pr 5390 ax-un 7718 ax-cnex 11129 ax-resscn 11130 ax-1cn 11131 ax-icn 11132 ax-addcl 11133 ax-addrcl 11134 ax-mulcl 11135 ax-mulrcl 11136 ax-mulcom 11137 ax-addass 11138 ax-mulass 11139 ax-distr 11140 ax-i2m1 11141 ax-1ne0 11142 ax-1rid 11143 ax-rnegex 11144 ax-rrecex 11145 ax-cnre 11146 ax-pre-lttri 11147 ax-pre-lttrn 11148 ax-pre-ltadd 11149 ax-pre-mulgt0 11150 |
| This theorem depends on definitions: df-bi 209 df-an 400 df-or 859 df-3or 1099 df-3an 1100 df-tru 1563 df-fal 1573 df-ex 1800 df-nf 1804 df-sb 2091 df-mo 2566 df-eu 2596 df-clab 2741 df-cleq 2754 df-clel 2837 df-nfc 2911 df-ne 2958 df-nel 3062 df-ral 3077 df-rex 3087 df-reu 3368 df-rab 3415 df-v 3456 df-sbc 3745 df-csb 3853 df-dif 3907 df-un 3909 df-in 3911 df-ss 3921 df-pss 3924 df-nul 4286 df-if 4481 df-pw 4557 df-sn 4583 df-pr 4585 df-op 4589 df-uni 4866 df-iun 4951 df-br 5101 df-opab 5163 df-mpt 5182 df-tr 5208 df-id 5542 df-eprel 5547 df-po 5555 df-so 5556 df-fr 5600 df-we 5602 df-xp 5653 df-rel 5654 df-cnv 5655 df-co 5656 df-dm 5657 df-rn 5658 df-res 5659 df-ima 5660 df-pred 6288 df-ord 6349 df-on 6350 df-lim 6351 df-suc 6352 df-iota 6477 df-fun 6523 df-fn 6524 df-f 6525 df-f1 6526 df-fo 6527 df-f1o 6528 df-fv 6529 df-riota 7353 df-ov 7399 df-oprab 7400 df-mpo 7401 df-om 7847 df-1st 7970 df-2nd 7971 df-frecs 8262 df-wrecs 8293 df-recs 8342 df-rdg 8381 df-1o 8437 df-er 8678 df-en 8928 df-dom 8929 df-sdom 8930 df-fin 8931 df-pnf 11218 df-mnf 11219 df-xr 11220 df-ltxr 11221 df-le 11222 df-sub 11416 df-neg 11417 df-nn 12211 df-2 12280 df-n0 12482 df-z 12569 df-uz 12840 df-fz 13513 df-struct 17183 df-slot 17218 df-ndx 17230 df-base 17246 df-plusg 17299 df-mgm 18674 |
| This theorem is referenced by: sgrp0b 18762 |
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