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| Mirrors > Home > MPE Home > Th. List > efmndmnd | Structured version Visualization version GIF version | ||
| Description: The monoid of endofunctions on a set 𝐴 is actually a monoid. (Contributed by AV, 31-Jan-2024.) |
| Ref | Expression |
|---|---|
| ielefmnd.g | ⊢ 𝐺 = (EndoFMnd‘𝐴) |
| Ref | Expression |
|---|---|
| efmndmnd | ⊢ (𝐴 ∈ 𝑉 → 𝐺 ∈ Mnd) |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | ielefmnd.g | . . . 4 ⊢ 𝐺 = (EndoFMnd‘𝐴) | |
| 2 | 1 | efmndsgrp 18854 | . . 3 ⊢ 𝐺 ∈ Smgrp |
| 3 | 2 | a1i 11 | . 2 ⊢ (𝐴 ∈ 𝑉 → 𝐺 ∈ Smgrp) |
| 4 | 1 | ielefmnd 18855 | . . 3 ⊢ (𝐴 ∈ 𝑉 → ( I ↾ 𝐴) ∈ (Base‘𝐺)) |
| 5 | oveq1 7374 | . . . . . . 7 ⊢ (𝑖 = ( I ↾ 𝐴) → (𝑖(+g‘𝐺)𝑓) = (( I ↾ 𝐴)(+g‘𝐺)𝑓)) | |
| 6 | 5 | eqeq1d 2738 | . . . . . 6 ⊢ (𝑖 = ( I ↾ 𝐴) → ((𝑖(+g‘𝐺)𝑓) = 𝑓 ↔ (( I ↾ 𝐴)(+g‘𝐺)𝑓) = 𝑓)) |
| 7 | oveq2 7375 | . . . . . . 7 ⊢ (𝑖 = ( I ↾ 𝐴) → (𝑓(+g‘𝐺)𝑖) = (𝑓(+g‘𝐺)( I ↾ 𝐴))) | |
| 8 | 7 | eqeq1d 2738 | . . . . . 6 ⊢ (𝑖 = ( I ↾ 𝐴) → ((𝑓(+g‘𝐺)𝑖) = 𝑓 ↔ (𝑓(+g‘𝐺)( I ↾ 𝐴)) = 𝑓)) |
| 9 | 6, 8 | anbi12d 633 | . . . . 5 ⊢ (𝑖 = ( I ↾ 𝐴) → (((𝑖(+g‘𝐺)𝑓) = 𝑓 ∧ (𝑓(+g‘𝐺)𝑖) = 𝑓) ↔ ((( I ↾ 𝐴)(+g‘𝐺)𝑓) = 𝑓 ∧ (𝑓(+g‘𝐺)( I ↾ 𝐴)) = 𝑓))) |
| 10 | 9 | ralbidv 3160 | . . . 4 ⊢ (𝑖 = ( I ↾ 𝐴) → (∀𝑓 ∈ (Base‘𝐺)((𝑖(+g‘𝐺)𝑓) = 𝑓 ∧ (𝑓(+g‘𝐺)𝑖) = 𝑓) ↔ ∀𝑓 ∈ (Base‘𝐺)((( I ↾ 𝐴)(+g‘𝐺)𝑓) = 𝑓 ∧ (𝑓(+g‘𝐺)( I ↾ 𝐴)) = 𝑓))) |
| 11 | 10 | adantl 481 | . . 3 ⊢ ((𝐴 ∈ 𝑉 ∧ 𝑖 = ( I ↾ 𝐴)) → (∀𝑓 ∈ (Base‘𝐺)((𝑖(+g‘𝐺)𝑓) = 𝑓 ∧ (𝑓(+g‘𝐺)𝑖) = 𝑓) ↔ ∀𝑓 ∈ (Base‘𝐺)((( I ↾ 𝐴)(+g‘𝐺)𝑓) = 𝑓 ∧ (𝑓(+g‘𝐺)( I ↾ 𝐴)) = 𝑓))) |
| 12 | eqid 2736 | . . . . . . . 8 ⊢ (Base‘𝐺) = (Base‘𝐺) | |
| 13 | 1, 12 | efmndbasf 18843 | . . . . . . 7 ⊢ (𝑓 ∈ (Base‘𝐺) → 𝑓:𝐴⟶𝐴) |
| 14 | 13 | adantl 481 | . . . . . 6 ⊢ ((𝐴 ∈ 𝑉 ∧ 𝑓 ∈ (Base‘𝐺)) → 𝑓:𝐴⟶𝐴) |
| 15 | fcoi2 6715 | . . . . . . 7 ⊢ (𝑓:𝐴⟶𝐴 → (( I ↾ 𝐴) ∘ 𝑓) = 𝑓) | |
| 16 | fcoi1 6714 | . . . . . . 7 ⊢ (𝑓:𝐴⟶𝐴 → (𝑓 ∘ ( I ↾ 𝐴)) = 𝑓) | |
| 17 | 15, 16 | jca 511 | . . . . . 6 ⊢ (𝑓:𝐴⟶𝐴 → ((( I ↾ 𝐴) ∘ 𝑓) = 𝑓 ∧ (𝑓 ∘ ( I ↾ 𝐴)) = 𝑓)) |
| 18 | 14, 17 | syl 17 | . . . . 5 ⊢ ((𝐴 ∈ 𝑉 ∧ 𝑓 ∈ (Base‘𝐺)) → ((( I ↾ 𝐴) ∘ 𝑓) = 𝑓 ∧ (𝑓 ∘ ( I ↾ 𝐴)) = 𝑓)) |
| 19 | eqid 2736 | . . . . . . . . 9 ⊢ (+g‘𝐺) = (+g‘𝐺) | |
| 20 | 1, 12, 19 | efmndov 18849 | . . . . . . . 8 ⊢ ((( I ↾ 𝐴) ∈ (Base‘𝐺) ∧ 𝑓 ∈ (Base‘𝐺)) → (( I ↾ 𝐴)(+g‘𝐺)𝑓) = (( I ↾ 𝐴) ∘ 𝑓)) |
| 21 | 4, 20 | sylan 581 | . . . . . . 7 ⊢ ((𝐴 ∈ 𝑉 ∧ 𝑓 ∈ (Base‘𝐺)) → (( I ↾ 𝐴)(+g‘𝐺)𝑓) = (( I ↾ 𝐴) ∘ 𝑓)) |
| 22 | 21 | eqeq1d 2738 | . . . . . 6 ⊢ ((𝐴 ∈ 𝑉 ∧ 𝑓 ∈ (Base‘𝐺)) → ((( I ↾ 𝐴)(+g‘𝐺)𝑓) = 𝑓 ↔ (( I ↾ 𝐴) ∘ 𝑓) = 𝑓)) |
| 23 | 4 | anim1ci 617 | . . . . . . . 8 ⊢ ((𝐴 ∈ 𝑉 ∧ 𝑓 ∈ (Base‘𝐺)) → (𝑓 ∈ (Base‘𝐺) ∧ ( I ↾ 𝐴) ∈ (Base‘𝐺))) |
| 24 | 1, 12, 19 | efmndov 18849 | . . . . . . . 8 ⊢ ((𝑓 ∈ (Base‘𝐺) ∧ ( I ↾ 𝐴) ∈ (Base‘𝐺)) → (𝑓(+g‘𝐺)( I ↾ 𝐴)) = (𝑓 ∘ ( I ↾ 𝐴))) |
| 25 | 23, 24 | syl 17 | . . . . . . 7 ⊢ ((𝐴 ∈ 𝑉 ∧ 𝑓 ∈ (Base‘𝐺)) → (𝑓(+g‘𝐺)( I ↾ 𝐴)) = (𝑓 ∘ ( I ↾ 𝐴))) |
| 26 | 25 | eqeq1d 2738 | . . . . . 6 ⊢ ((𝐴 ∈ 𝑉 ∧ 𝑓 ∈ (Base‘𝐺)) → ((𝑓(+g‘𝐺)( I ↾ 𝐴)) = 𝑓 ↔ (𝑓 ∘ ( I ↾ 𝐴)) = 𝑓)) |
| 27 | 22, 26 | anbi12d 633 | . . . . 5 ⊢ ((𝐴 ∈ 𝑉 ∧ 𝑓 ∈ (Base‘𝐺)) → (((( I ↾ 𝐴)(+g‘𝐺)𝑓) = 𝑓 ∧ (𝑓(+g‘𝐺)( I ↾ 𝐴)) = 𝑓) ↔ ((( I ↾ 𝐴) ∘ 𝑓) = 𝑓 ∧ (𝑓 ∘ ( I ↾ 𝐴)) = 𝑓))) |
| 28 | 18, 27 | mpbird 257 | . . . 4 ⊢ ((𝐴 ∈ 𝑉 ∧ 𝑓 ∈ (Base‘𝐺)) → ((( I ↾ 𝐴)(+g‘𝐺)𝑓) = 𝑓 ∧ (𝑓(+g‘𝐺)( I ↾ 𝐴)) = 𝑓)) |
| 29 | 28 | ralrimiva 3129 | . . 3 ⊢ (𝐴 ∈ 𝑉 → ∀𝑓 ∈ (Base‘𝐺)((( I ↾ 𝐴)(+g‘𝐺)𝑓) = 𝑓 ∧ (𝑓(+g‘𝐺)( I ↾ 𝐴)) = 𝑓)) |
| 30 | 4, 11, 29 | rspcedvd 3566 | . 2 ⊢ (𝐴 ∈ 𝑉 → ∃𝑖 ∈ (Base‘𝐺)∀𝑓 ∈ (Base‘𝐺)((𝑖(+g‘𝐺)𝑓) = 𝑓 ∧ (𝑓(+g‘𝐺)𝑖) = 𝑓)) |
| 31 | 12, 19 | ismnddef 18704 | . 2 ⊢ (𝐺 ∈ Mnd ↔ (𝐺 ∈ Smgrp ∧ ∃𝑖 ∈ (Base‘𝐺)∀𝑓 ∈ (Base‘𝐺)((𝑖(+g‘𝐺)𝑓) = 𝑓 ∧ (𝑓(+g‘𝐺)𝑖) = 𝑓))) |
| 32 | 3, 30, 31 | sylanbrc 584 | 1 ⊢ (𝐴 ∈ 𝑉 → 𝐺 ∈ Mnd) |
| Colors of variables: wff setvar class |
| Syntax hints: → wi 4 ↔ wb 206 ∧ wa 395 = wceq 1542 ∈ wcel 2114 ∀wral 3051 ∃wrex 3061 I cid 5525 ↾ cres 5633 ∘ ccom 5635 ⟶wf 6494 ‘cfv 6498 (class class class)co 7367 Basecbs 17179 +gcplusg 17220 Smgrpcsgrp 18686 Mndcmnd 18702 EndoFMndcefmnd 18836 |
| This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1797 ax-4 1811 ax-5 1912 ax-6 1969 ax-7 2010 ax-8 2116 ax-9 2124 ax-10 2147 ax-11 2163 ax-12 2185 ax-ext 2708 ax-rep 5212 ax-sep 5231 ax-nul 5241 ax-pow 5307 ax-pr 5375 ax-un 7689 ax-cnex 11094 ax-resscn 11095 ax-1cn 11096 ax-icn 11097 ax-addcl 11098 ax-addrcl 11099 ax-mulcl 11100 ax-mulrcl 11101 ax-mulcom 11102 ax-addass 11103 ax-mulass 11104 ax-distr 11105 ax-i2m1 11106 ax-1ne0 11107 ax-1rid 11108 ax-rnegex 11109 ax-rrecex 11110 ax-cnre 11111 ax-pre-lttri 11112 ax-pre-lttrn 11113 ax-pre-ltadd 11114 ax-pre-mulgt0 11115 |
| This theorem depends on definitions: df-bi 207 df-an 396 df-or 849 df-3or 1088 df-3an 1089 df-tru 1545 df-fal 1555 df-ex 1782 df-nf 1786 df-sb 2069 df-mo 2539 df-eu 2569 df-clab 2715 df-cleq 2728 df-clel 2811 df-nfc 2885 df-ne 2933 df-nel 3037 df-ral 3052 df-rex 3062 df-reu 3343 df-rab 3390 df-v 3431 df-sbc 3729 df-csb 3838 df-dif 3892 df-un 3894 df-in 3896 df-ss 3906 df-pss 3909 df-nul 4274 df-if 4467 df-pw 4543 df-sn 4568 df-pr 4570 df-tp 4572 df-op 4574 df-uni 4851 df-iun 4935 df-br 5086 df-opab 5148 df-mpt 5167 df-tr 5193 df-id 5526 df-eprel 5531 df-po 5539 df-so 5540 df-fr 5584 df-we 5586 df-xp 5637 df-rel 5638 df-cnv 5639 df-co 5640 df-dm 5641 df-rn 5642 df-res 5643 df-ima 5644 df-pred 6265 df-ord 6326 df-on 6327 df-lim 6328 df-suc 6329 df-iota 6454 df-fun 6500 df-fn 6501 df-f 6502 df-f1 6503 df-fo 6504 df-f1o 6505 df-fv 6506 df-riota 7324 df-ov 7370 df-oprab 7371 df-mpo 7372 df-om 7818 df-1st 7942 df-2nd 7943 df-frecs 8231 df-wrecs 8262 df-recs 8311 df-rdg 8349 df-1o 8405 df-er 8643 df-map 8775 df-en 8894 df-dom 8895 df-sdom 8896 df-fin 8897 df-pnf 11181 df-mnf 11182 df-xr 11183 df-ltxr 11184 df-le 11185 df-sub 11379 df-neg 11380 df-nn 12175 df-2 12244 df-3 12245 df-4 12246 df-5 12247 df-6 12248 df-7 12249 df-8 12250 df-9 12251 df-n0 12438 df-z 12525 df-uz 12789 df-fz 13462 df-struct 17117 df-slot 17152 df-ndx 17164 df-base 17180 df-plusg 17233 df-tset 17239 df-mgm 18608 df-sgrp 18687 df-mnd 18703 df-efmnd 18837 |
| This theorem is referenced by: efmnd0nmnd 18858 submefmnd 18863 sursubmefmnd 18864 injsubmefmnd 18865 idressubmefmnd 18866 idresefmnd 18867 symgsubmefmndALT 19378 efmndtmd 24066 |
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