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| Mirrors > Home > MPE Home > Th. List > efmndid | Structured version Visualization version GIF version | ||
| Description: The identity function restricted to a set 𝐴 is the identity element of the monoid of endofunctions on 𝐴. (Contributed by AV, 25-Jan-2024.) |
| Ref | Expression |
|---|---|
| ielefmnd.g | ⊢ 𝐺 = (EndoFMnd‘𝐴) |
| Ref | Expression |
|---|---|
| efmndid | ⊢ (𝐴 ∈ 𝑉 → ( I ↾ 𝐴) = (0g‘𝐺)) |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | eqid 2760 | . 2 ⊢ (Base‘𝐺) = (Base‘𝐺) | |
| 2 | eqid 2760 | . 2 ⊢ (0g‘𝐺) = (0g‘𝐺) | |
| 3 | eqid 2760 | . 2 ⊢ (+g‘𝐺) = (+g‘𝐺) | |
| 4 | ielefmnd.g | . . 3 ⊢ 𝐺 = (EndoFMnd‘𝐴) | |
| 5 | 4 | ielefmnd 18996 | . 2 ⊢ (𝐴 ∈ 𝑉 → ( I ↾ 𝐴) ∈ (Base‘𝐺)) |
| 6 | 4, 1, 3 | efmndov 18990 | . . . 4 ⊢ ((( I ↾ 𝐴) ∈ (Base‘𝐺) ∧ 𝑓 ∈ (Base‘𝐺)) → (( I ↾ 𝐴)(+g‘𝐺)𝑓) = (( I ↾ 𝐴) ∘ 𝑓)) |
| 7 | 5, 6 | sylan 592 | . . 3 ⊢ ((𝐴 ∈ 𝑉 ∧ 𝑓 ∈ (Base‘𝐺)) → (( I ↾ 𝐴)(+g‘𝐺)𝑓) = (( I ↾ 𝐴) ∘ 𝑓)) |
| 8 | 4, 1 | efmndbasf 18984 | . . . . 5 ⊢ (𝑓 ∈ (Base‘𝐺) → 𝑓:𝐴⟶𝐴) |
| 9 | 8 | adantl 487 | . . . 4 ⊢ ((𝐴 ∈ 𝑉 ∧ 𝑓 ∈ (Base‘𝐺)) → 𝑓:𝐴⟶𝐴) |
| 10 | fcoi2 6750 | . . . 4 ⊢ (𝑓:𝐴⟶𝐴 → (( I ↾ 𝐴) ∘ 𝑓) = 𝑓) | |
| 11 | 9, 10 | syl 18 | . . 3 ⊢ ((𝐴 ∈ 𝑉 ∧ 𝑓 ∈ (Base‘𝐺)) → (( I ↾ 𝐴) ∘ 𝑓) = 𝑓) |
| 12 | 7, 11 | eqtrd 2795 | . 2 ⊢ ((𝐴 ∈ 𝑉 ∧ 𝑓 ∈ (Base‘𝐺)) → (( I ↾ 𝐴)(+g‘𝐺)𝑓) = 𝑓) |
| 13 | 5 | anim1ci 628 | . . . 4 ⊢ ((𝐴 ∈ 𝑉 ∧ 𝑓 ∈ (Base‘𝐺)) → (𝑓 ∈ (Base‘𝐺) ∧ ( I ↾ 𝐴) ∈ (Base‘𝐺))) |
| 14 | 4, 1, 3 | efmndov 18990 | . . . 4 ⊢ ((𝑓 ∈ (Base‘𝐺) ∧ ( I ↾ 𝐴) ∈ (Base‘𝐺)) → (𝑓(+g‘𝐺)( I ↾ 𝐴)) = (𝑓 ∘ ( I ↾ 𝐴))) |
| 15 | 13, 14 | syl 18 | . . 3 ⊢ ((𝐴 ∈ 𝑉 ∧ 𝑓 ∈ (Base‘𝐺)) → (𝑓(+g‘𝐺)( I ↾ 𝐴)) = (𝑓 ∘ ( I ↾ 𝐴))) |
| 16 | fcoi1 6749 | . . . 4 ⊢ (𝑓:𝐴⟶𝐴 → (𝑓 ∘ ( I ↾ 𝐴)) = 𝑓) | |
| 17 | 9, 16 | syl 18 | . . 3 ⊢ ((𝐴 ∈ 𝑉 ∧ 𝑓 ∈ (Base‘𝐺)) → (𝑓 ∘ ( I ↾ 𝐴)) = 𝑓) |
| 18 | 15, 17 | eqtrd 2795 | . 2 ⊢ ((𝐴 ∈ 𝑉 ∧ 𝑓 ∈ (Base‘𝐺)) → (𝑓(+g‘𝐺)( I ↾ 𝐴)) = 𝑓) |
| 19 | 1, 2, 3, 5, 12, 18 | ismgmid2 18762 | 1 ⊢ (𝐴 ∈ 𝑉 → ( I ↾ 𝐴) = (0g‘𝐺)) |
| Colors of variables: wff setvar class |
| This proof depends on syntax axioms: → wi 4 ∧ wa 401 = wceq 1570 ∈ wcel 2145 I cid 5549 ↾ cres 5657 ∘ ccom 5659 ⟶wf 6529 ‘cfv 6533 (class class class)co 7413 Basecbs 17301 +gcplusg 17342 0gc0g 17524 EndoFMndcefmnd 18977 |
| This proof depends on axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1828 ax-4 1842 ax-5 1943 ax-6 2000 ax-7 2041 ax-8 2147 ax-9 2155 ax-10 2178 ax-11 2194 ax-12 2213 ax-ext 2732 ax-rep 5232 ax-sep 5251 ax-nul 5263 ax-pow 5330 ax-pr 5398 ax-un 7736 ax-cnex 11180 ax-resscn 11181 ax-1cn 11182 ax-icn 11183 ax-addcl 11184 ax-addrcl 11185 ax-mulcl 11186 ax-mulrcl 11187 ax-mulcom 11188 ax-addass 11189 ax-mulass 11190 ax-distr 11191 ax-i2m1 11192 ax-1ne0 11193 ax-1rid 11194 ax-rnegex 11195 ax-rrecex 11196 ax-cnre 11197 ax-pre-lttri 11198 ax-pre-lttrn 11199 ax-pre-ltadd 11200 ax-pre-mulgt0 11201 |
| This proof depends on definitions: df-bi 210 df-an 402 df-or 862 df-3or 1104 df-3an 1105 df-tru 1573 df-fal 1583 df-ex 1813 df-nf 1817 df-sb 2100 df-mo 2564 df-eu 2594 df-clab 2739 df-cleq 2752 df-clel 2835 df-nfc 2909 df-ne 2956 df-nel 3062 df-ral 3077 df-rex 3087 df-rmo 3365 df-reu 3366 df-rab 3413 df-v 3452 df-sbc 3740 df-csb 3848 df-dif 3902 df-un 3904 df-in 3906 df-ss 3916 df-pss 3919 df-nul 4280 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 5104 df-opab 5168 df-mpt 5187 df-tr 5213 df-id 5550 df-eprel 5555 df-po 5563 df-so 5564 df-fr 5608 df-we 5610 df-xp 5661 df-rel 5662 df-cnv 5663 df-co 5664 df-dm 5665 df-rn 5666 df-res 5667 df-ima 5668 df-pred 6299 df-ord 6360 df-on 6361 df-lim 6362 df-suc 6363 df-iota 6489 df-fun 6535 df-fn 6536 df-f 6537 df-f1 6538 df-fo 6539 df-f1o 6540 df-fv 6541 df-riota 7370 df-ov 7416 df-oprab 7417 df-mpo 7418 df-om 7863 df-1st 7986 df-2nd 7987 df-frecs 8280 df-wrecs 8311 df-recs 8360 df-rdg 8399 df-1o 8455 df-er 8696 df-map 8828 df-en 8953 df-dom 8954 df-sdom 8955 df-fin 8956 df-pnf 11269 df-mnf 11270 df-xr 11271 df-ltxr 11272 df-le 11273 df-sub 11467 df-neg 11468 df-nn 12258 df-2 12327 df-3 12328 df-4 12329 df-5 12330 df-6 12331 df-7 12332 df-8 12333 df-9 12334 df-n0 12529 df-z 12616 df-uz 12888 df-fz 13562 df-struct 17239 df-slot 17274 df-ndx 17286 df-base 17302 df-plusg 17355 df-tset 17361 df-0g 17526 df-efmnd 18978 |
| This theorem is used by: sursubmefmnd 19005 injsubmefmnd 19006 idressubmefmnd 19007 smndex1n0mnd 19024 smndex2dnrinv 19027 smndex2dlinvh 19029 symgid 19528 symgsubmefmndALT 19530 |
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