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| Mirrors > Home > MPE Home > Th. List > sgrpnmndex | Structured version Visualization version GIF version | ||
| Description: There is a semigroup which is not a monoid. (Contributed by AV, 29-Jan-2020.) |
| Ref | Expression |
|---|---|
| sgrpnmndex | ⊢ ∃𝑚 ∈ Smgrp 𝑚 ∉ Mnd |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | prhash2ex 14431 | . 2 ⊢ (♯‘{0, 1}) = 2 | |
| 2 | eqid 2763 | . . . 4 ⊢ {0, 1} = {0, 1} | |
| 3 | prex 5409 | . . . . . 6 ⊢ {0, 1} ∈ V | |
| 4 | eqeq1 2767 | . . . . . . . . . . 11 ⊢ (𝑥 = 𝑢 → (𝑥 = 0 ↔ 𝑢 = 0)) | |
| 5 | 4 | ifbid 4511 | . . . . . . . . . 10 ⊢ (𝑥 = 𝑢 → if(𝑥 = 0, 0, 1) = if(𝑢 = 0, 0, 1)) |
| 6 | eqidd 2764 | . . . . . . . . . 10 ⊢ (𝑦 = 𝑣 → if(𝑢 = 0, 0, 1) = if(𝑢 = 0, 0, 1)) | |
| 7 | 5, 6 | cbvmpov 7505 | . . . . . . . . 9 ⊢ (𝑥 ∈ {0, 1}, 𝑦 ∈ {0, 1} ↦ if(𝑥 = 0, 0, 1)) = (𝑢 ∈ {0, 1}, 𝑣 ∈ {0, 1} ↦ if(𝑢 = 0, 0, 1)) |
| 8 | 7 | opeq2i 4842 | . . . . . . . 8 ⊢ 〈(+g‘ndx), (𝑥 ∈ {0, 1}, 𝑦 ∈ {0, 1} ↦ if(𝑥 = 0, 0, 1))〉 = 〈(+g‘ndx), (𝑢 ∈ {0, 1}, 𝑣 ∈ {0, 1} ↦ if(𝑢 = 0, 0, 1))〉 |
| 9 | 8 | preq2i 4703 | . . . . . . 7 ⊢ {〈(Base‘ndx), {0, 1}〉, 〈(+g‘ndx), (𝑥 ∈ {0, 1}, 𝑦 ∈ {0, 1} ↦ if(𝑥 = 0, 0, 1))〉} = {〈(Base‘ndx), {0, 1}〉, 〈(+g‘ndx), (𝑢 ∈ {0, 1}, 𝑣 ∈ {0, 1} ↦ if(𝑢 = 0, 0, 1))〉} |
| 10 | 9 | grpbase 17337 | . . . . . 6 ⊢ ({0, 1} ∈ V → {0, 1} = (Base‘{〈(Base‘ndx), {0, 1}〉, 〈(+g‘ndx), (𝑥 ∈ {0, 1}, 𝑦 ∈ {0, 1} ↦ if(𝑥 = 0, 0, 1))〉})) |
| 11 | 3, 10 | ax-mp 5 | . . . . 5 ⊢ {0, 1} = (Base‘{〈(Base‘ndx), {0, 1}〉, 〈(+g‘ndx), (𝑥 ∈ {0, 1}, 𝑦 ∈ {0, 1} ↦ if(𝑥 = 0, 0, 1))〉}) |
| 12 | 11 | eqcomi 2772 | . . . 4 ⊢ (Base‘{〈(Base‘ndx), {0, 1}〉, 〈(+g‘ndx), (𝑥 ∈ {0, 1}, 𝑦 ∈ {0, 1} ↦ if(𝑥 = 0, 0, 1))〉}) = {0, 1} |
| 13 | 3, 3 | mpoex 8072 | . . . . . 6 ⊢ (𝑢 ∈ {0, 1}, 𝑣 ∈ {0, 1} ↦ if(𝑢 = 0, 0, 1)) ∈ V |
| 14 | 9 | grpplusg 17338 | . . . . . 6 ⊢ ((𝑢 ∈ {0, 1}, 𝑣 ∈ {0, 1} ↦ if(𝑢 = 0, 0, 1)) ∈ V → (𝑢 ∈ {0, 1}, 𝑣 ∈ {0, 1} ↦ if(𝑢 = 0, 0, 1)) = (+g‘{〈(Base‘ndx), {0, 1}〉, 〈(+g‘ndx), (𝑥 ∈ {0, 1}, 𝑦 ∈ {0, 1} ↦ if(𝑥 = 0, 0, 1))〉})) |
| 15 | 13, 14 | ax-mp 5 | . . . . 5 ⊢ (𝑢 ∈ {0, 1}, 𝑣 ∈ {0, 1} ↦ if(𝑢 = 0, 0, 1)) = (+g‘{〈(Base‘ndx), {0, 1}〉, 〈(+g‘ndx), (𝑥 ∈ {0, 1}, 𝑦 ∈ {0, 1} ↦ if(𝑥 = 0, 0, 1))〉}) |
| 16 | 15 | eqcomi 2772 | . . . 4 ⊢ (+g‘{〈(Base‘ndx), {0, 1}〉, 〈(+g‘ndx), (𝑥 ∈ {0, 1}, 𝑦 ∈ {0, 1} ↦ if(𝑥 = 0, 0, 1))〉}) = (𝑢 ∈ {0, 1}, 𝑣 ∈ {0, 1} ↦ if(𝑢 = 0, 0, 1)) |
| 17 | 2, 12, 16 | sgrp2nmndlem4 18985 | . . 3 ⊢ ((♯‘{0, 1}) = 2 → {〈(Base‘ndx), {0, 1}〉, 〈(+g‘ndx), (𝑥 ∈ {0, 1}, 𝑦 ∈ {0, 1} ↦ if(𝑥 = 0, 0, 1))〉} ∈ Smgrp) |
| 18 | neleq1 3070 | . . . 4 ⊢ (𝑚 = {〈(Base‘ndx), {0, 1}〉, 〈(+g‘ndx), (𝑥 ∈ {0, 1}, 𝑦 ∈ {0, 1} ↦ if(𝑥 = 0, 0, 1))〉} → (𝑚 ∉ Mnd ↔ {〈(Base‘ndx), {0, 1}〉, 〈(+g‘ndx), (𝑥 ∈ {0, 1}, 𝑦 ∈ {0, 1} ↦ if(𝑥 = 0, 0, 1))〉} ∉ Mnd)) | |
| 19 | 18 | adantl 486 | . . 3 ⊢ (((♯‘{0, 1}) = 2 ∧ 𝑚 = {〈(Base‘ndx), {0, 1}〉, 〈(+g‘ndx), (𝑥 ∈ {0, 1}, 𝑦 ∈ {0, 1} ↦ if(𝑥 = 0, 0, 1))〉}) → (𝑚 ∉ Mnd ↔ {〈(Base‘ndx), {0, 1}〉, 〈(+g‘ndx), (𝑥 ∈ {0, 1}, 𝑦 ∈ {0, 1} ↦ if(𝑥 = 0, 0, 1))〉} ∉ Mnd)) |
| 20 | 2, 12, 16 | sgrp2nmndlem5 18986 | . . 3 ⊢ ((♯‘{0, 1}) = 2 → {〈(Base‘ndx), {0, 1}〉, 〈(+g‘ndx), (𝑥 ∈ {0, 1}, 𝑦 ∈ {0, 1} ↦ if(𝑥 = 0, 0, 1))〉} ∉ Mnd) |
| 21 | 17, 19, 20 | rspcedvd 3583 | . 2 ⊢ ((♯‘{0, 1}) = 2 → ∃𝑚 ∈ Smgrp 𝑚 ∉ Mnd) |
| 22 | 1, 21 | ax-mp 5 | 1 ⊢ ∃𝑚 ∈ Smgrp 𝑚 ∉ Mnd |
| Colors of variables: wff setvar class |
| Syntax hints: ↔ wb 209 = wceq 1570 ∈ wcel 2143 ∉ wnel 3064 ∃wrex 3089 Vcvv 3455 ifcif 4487 {cpr 4591 〈cop 4595 ‘cfv 6536 ∈ cmpo 7412 0cc0 11095 1c1 11096 2c2 12290 ♯chash 14362 ndxcnx 17248 Basecbs 17264 +gcplusg 17305 Smgrpcsgrp 18771 Mndcmnd 18787 |
| This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1825 ax-4 1839 ax-5 1940 ax-6 1997 ax-7 2038 ax-8 2145 ax-9 2153 ax-10 2176 ax-11 2192 ax-12 2213 ax-ext 2735 ax-rep 5238 ax-sep 5257 ax-nul 5269 ax-pow 5336 ax-pr 5404 ax-un 7732 ax-cnex 11151 ax-resscn 11152 ax-1cn 11153 ax-icn 11154 ax-addcl 11155 ax-addrcl 11156 ax-mulcl 11157 ax-mulrcl 11158 ax-mulcom 11159 ax-addass 11160 ax-mulass 11161 ax-distr 11162 ax-i2m1 11163 ax-1ne0 11164 ax-1rid 11165 ax-rnegex 11166 ax-rrecex 11167 ax-cnre 11168 ax-pre-lttri 11169 ax-pre-lttrn 11170 ax-pre-ltadd 11171 ax-pre-mulgt0 11172 |
| This theorem depends on definitions: df-bi 210 df-an 401 df-or 861 df-3or 1104 df-3an 1105 df-tru 1573 df-fal 1583 df-ex 1810 df-nf 1814 df-sb 2097 df-mo 2567 df-eu 2597 df-clab 2742 df-cleq 2755 df-clel 2838 df-nfc 2912 df-ne 2959 df-nel 3065 df-ral 3080 df-rex 3090 df-reu 3370 df-rab 3417 df-v 3457 df-sbc 3745 df-csb 3854 df-dif 3908 df-un 3910 df-in 3912 df-ss 3922 df-pss 3925 df-nul 4287 df-if 4488 df-pw 4564 df-sn 4590 df-pr 4592 df-op 4596 df-uni 4873 df-int 4913 df-iun 4958 df-br 5110 df-opab 5174 df-mpt 5193 df-tr 5219 df-id 5556 df-eprel 5561 df-po 5569 df-so 5570 df-fr 5614 df-we 5616 df-xp 5667 df-rel 5668 df-cnv 5669 df-co 5670 df-dm 5671 df-rn 5672 df-res 5673 df-ima 5674 df-pred 6302 df-ord 6363 df-on 6364 df-lim 6365 df-suc 6366 df-iota 6492 df-fun 6538 df-fn 6539 df-f 6540 df-f1 6541 df-fo 6542 df-f1o 6543 df-fv 6544 df-riota 7367 df-ov 7413 df-oprab 7414 df-mpo 7415 df-om 7859 df-1st 7982 df-2nd 7983 df-frecs 8274 df-wrecs 8305 df-recs 8354 df-rdg 8393 df-1o 8449 df-oadd 8453 df-er 8690 df-en 8940 df-dom 8941 df-sdom 8942 df-fin 8943 df-dju 9883 df-card 9921 df-pnf 11240 df-mnf 11241 df-xr 11242 df-ltxr 11243 df-le 11244 df-sub 11438 df-neg 11439 df-nn 12229 df-2 12298 df-n0 12500 df-z 12587 df-uz 12858 df-fz 13531 df-hash 14363 df-struct 17202 df-slot 17237 df-ndx 17249 df-base 17265 df-plusg 17318 df-mgm 18693 df-sgrp 18772 df-mnd 18788 |
| This theorem is referenced by: mndsssgrp 18991 |
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