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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 18922 | . . 3 ⊢ 𝐺 ∈ Smgrp |
| 3 | 2 | a1i 11 | . 2 ⊢ (𝐴 ∈ 𝑉 → 𝐺 ∈ Smgrp) |
| 4 | 1 | ielefmnd 18923 | . . 3 ⊢ (𝐴 ∈ 𝑉 → ( I ↾ 𝐴) ∈ (Base‘𝐺)) |
| 5 | oveq1 7405 | . . . . . . 7 ⊢ (𝑖 = ( I ↾ 𝐴) → (𝑖(+g‘𝐺)𝑓) = (( I ↾ 𝐴)(+g‘𝐺)𝑓)) | |
| 6 | 5 | eqeq1d 2766 | . . . . . 6 ⊢ (𝑖 = ( I ↾ 𝐴) → ((𝑖(+g‘𝐺)𝑓) = 𝑓 ↔ (( I ↾ 𝐴)(+g‘𝐺)𝑓) = 𝑓)) |
| 7 | oveq2 7406 | . . . . . . 7 ⊢ (𝑖 = ( I ↾ 𝐴) → (𝑓(+g‘𝐺)𝑖) = (𝑓(+g‘𝐺)( I ↾ 𝐴))) | |
| 8 | 7 | eqeq1d 2766 | . . . . . 6 ⊢ (𝑖 = ( I ↾ 𝐴) → ((𝑓(+g‘𝐺)𝑖) = 𝑓 ↔ (𝑓(+g‘𝐺)( I ↾ 𝐴)) = 𝑓)) |
| 9 | 6, 8 | anbi12d 641 | . . . . 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 3187 | . . . 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 485 | . . 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 2764 | . . . . . . . 8 ⊢ (Base‘𝐺) = (Base‘𝐺) | |
| 13 | 1, 12 | efmndbasf 18911 | . . . . . . 7 ⊢ (𝑓 ∈ (Base‘𝐺) → 𝑓:𝐴⟶𝐴) |
| 14 | 13 | adantl 485 | . . . . . 6 ⊢ ((𝐴 ∈ 𝑉 ∧ 𝑓 ∈ (Base‘𝐺)) → 𝑓:𝐴⟶𝐴) |
| 15 | fcoi2 6741 | . . . . . . 7 ⊢ (𝑓:𝐴⟶𝐴 → (( I ↾ 𝐴) ∘ 𝑓) = 𝑓) | |
| 16 | fcoi1 6740 | . . . . . . 7 ⊢ (𝑓:𝐴⟶𝐴 → (𝑓 ∘ ( I ↾ 𝐴)) = 𝑓) | |
| 17 | 15, 16 | jca 519 | . . . . . 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 2764 | . . . . . . . . 9 ⊢ (+g‘𝐺) = (+g‘𝐺) | |
| 20 | 1, 12, 19 | efmndov 18917 | . . . . . . . 8 ⊢ ((( I ↾ 𝐴) ∈ (Base‘𝐺) ∧ 𝑓 ∈ (Base‘𝐺)) → (( I ↾ 𝐴)(+g‘𝐺)𝑓) = (( I ↾ 𝐴) ∘ 𝑓)) |
| 21 | 4, 20 | sylan 589 | . . . . . . 7 ⊢ ((𝐴 ∈ 𝑉 ∧ 𝑓 ∈ (Base‘𝐺)) → (( I ↾ 𝐴)(+g‘𝐺)𝑓) = (( I ↾ 𝐴) ∘ 𝑓)) |
| 22 | 21 | eqeq1d 2766 | . . . . . 6 ⊢ ((𝐴 ∈ 𝑉 ∧ 𝑓 ∈ (Base‘𝐺)) → ((( I ↾ 𝐴)(+g‘𝐺)𝑓) = 𝑓 ↔ (( I ↾ 𝐴) ∘ 𝑓) = 𝑓)) |
| 23 | 4 | anim1ci 625 | . . . . . . . 8 ⊢ ((𝐴 ∈ 𝑉 ∧ 𝑓 ∈ (Base‘𝐺)) → (𝑓 ∈ (Base‘𝐺) ∧ ( I ↾ 𝐴) ∈ (Base‘𝐺))) |
| 24 | 1, 12, 19 | efmndov 18917 | . . . . . . . 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 2766 | . . . . . 6 ⊢ ((𝐴 ∈ 𝑉 ∧ 𝑓 ∈ (Base‘𝐺)) → ((𝑓(+g‘𝐺)( I ↾ 𝐴)) = 𝑓 ↔ (𝑓 ∘ ( I ↾ 𝐴)) = 𝑓)) |
| 27 | 22, 26 | anbi12d 641 | . . . . 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 259 | . . . 4 ⊢ ((𝐴 ∈ 𝑉 ∧ 𝑓 ∈ (Base‘𝐺)) → ((( I ↾ 𝐴)(+g‘𝐺)𝑓) = 𝑓 ∧ (𝑓(+g‘𝐺)( I ↾ 𝐴)) = 𝑓)) |
| 29 | 28 | ralrimiva 3156 | . . 3 ⊢ (𝐴 ∈ 𝑉 → ∀𝑓 ∈ (Base‘𝐺)((( I ↾ 𝐴)(+g‘𝐺)𝑓) = 𝑓 ∧ (𝑓(+g‘𝐺)( I ↾ 𝐴)) = 𝑓)) |
| 30 | 4, 11, 29 | rspcedvd 3585 | . 2 ⊢ (𝐴 ∈ 𝑉 → ∃𝑖 ∈ (Base‘𝐺)∀𝑓 ∈ (Base‘𝐺)((𝑖(+g‘𝐺)𝑓) = 𝑓 ∧ (𝑓(+g‘𝐺)𝑖) = 𝑓)) |
| 31 | 12, 19 | ismnddef 18772 | . 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 592 | 1 ⊢ (𝐴 ∈ 𝑉 → 𝐺 ∈ Mnd) |
| Colors of variables: wff setvar class |
| Syntax hints: → wi 4 ↔ wb 208 ∧ wa 399 = wceq 1562 ∈ wcel 2144 ∀wral 3078 ∃wrex 3088 I cid 5543 ↾ cres 5651 ∘ ccom 5653 ⟶wf 6519 ‘cfv 6523 (class class class)co 7398 Basecbs 17247 +gcplusg 17288 Smgrpcsgrp 18754 Mndcmnd 18770 EndoFMndcefmnd 18904 |
| This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1817 ax-4 1831 ax-5 1932 ax-6 1989 ax-7 2030 ax-8 2146 ax-9 2154 ax-10 2177 ax-11 2193 ax-12 2214 ax-ext 2736 ax-rep 5229 ax-sep 5248 ax-nul 5258 ax-pow 5324 ax-pr 5392 ax-un 7720 ax-cnex 11131 ax-resscn 11132 ax-1cn 11133 ax-icn 11134 ax-addcl 11135 ax-addrcl 11136 ax-mulcl 11137 ax-mulrcl 11138 ax-mulcom 11139 ax-addass 11140 ax-mulass 11141 ax-distr 11142 ax-i2m1 11143 ax-1ne0 11144 ax-1rid 11145 ax-rnegex 11146 ax-rrecex 11147 ax-cnre 11148 ax-pre-lttri 11149 ax-pre-lttrn 11150 ax-pre-ltadd 11151 ax-pre-mulgt0 11152 |
| This theorem depends on definitions: df-bi 209 df-an 400 df-or 859 df-3or 1100 df-3an 1101 df-tru 1565 df-fal 1575 df-ex 1802 df-nf 1806 df-sb 2093 df-mo 2568 df-eu 2598 df-clab 2743 df-cleq 2756 df-clel 2839 df-nfc 2913 df-ne 2960 df-nel 3064 df-ral 3079 df-rex 3089 df-reu 3370 df-rab 3417 df-v 3458 df-sbc 3747 df-csb 3855 df-dif 3909 df-un 3911 df-in 3913 df-ss 3923 df-pss 3926 df-nul 4288 df-if 4483 df-pw 4559 df-sn 4585 df-pr 4587 df-tp 4589 df-op 4591 df-uni 4868 df-iun 4953 df-br 5103 df-opab 5165 df-mpt 5184 df-tr 5210 df-id 5544 df-eprel 5549 df-po 5557 df-so 5558 df-fr 5602 df-we 5604 df-xp 5655 df-rel 5656 df-cnv 5657 df-co 5658 df-dm 5659 df-rn 5660 df-res 5661 df-ima 5662 df-pred 6290 df-ord 6351 df-on 6352 df-lim 6353 df-suc 6354 df-iota 6479 df-fun 6525 df-fn 6526 df-f 6527 df-f1 6528 df-fo 6529 df-f1o 6530 df-fv 6531 df-riota 7355 df-ov 7401 df-oprab 7402 df-mpo 7403 df-om 7849 df-1st 7972 df-2nd 7973 df-frecs 8264 df-wrecs 8295 df-recs 8344 df-rdg 8383 df-1o 8439 df-er 8680 df-map 8812 df-en 8930 df-dom 8931 df-sdom 8932 df-fin 8933 df-pnf 11220 df-mnf 11221 df-xr 11222 df-ltxr 11223 df-le 11224 df-sub 11418 df-neg 11419 df-nn 12213 df-2 12282 df-3 12283 df-4 12284 df-5 12285 df-6 12286 df-7 12287 df-8 12288 df-9 12289 df-n0 12484 df-z 12571 df-uz 12842 df-fz 13515 df-struct 17185 df-slot 17220 df-ndx 17232 df-base 17248 df-plusg 17301 df-tset 17307 df-mgm 18676 df-sgrp 18755 df-mnd 18771 df-efmnd 18905 |
| This theorem is referenced by: efmnd0nmnd 18926 submefmnd 18931 sursubmefmnd 18932 injsubmefmnd 18933 idressubmefmnd 18934 idresefmnd 18935 symgsubmefmndALT 19445 efmndtmd 24163 |
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