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Mirrors > Home > MPE Home > Th. List > symgbasfi | Structured version Visualization version GIF version |
Description: The symmetric group on a finite index set is finite. (Contributed by SO, 9-Jul-2018.) |
Ref | Expression |
---|---|
symgbas.1 | ⊢ 𝐺 = (SymGrp‘𝐴) |
symgbas.2 | ⊢ 𝐵 = (Base‘𝐺) |
Ref | Expression |
---|---|
symgbasfi | ⊢ (𝐴 ∈ Fin → 𝐵 ∈ Fin) |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | mapfi 8814 | . . 3 ⊢ ((𝐴 ∈ Fin ∧ 𝐴 ∈ Fin) → (𝐴 ↑m 𝐴) ∈ Fin) | |
2 | 1 | anidms 569 | . 2 ⊢ (𝐴 ∈ Fin → (𝐴 ↑m 𝐴) ∈ Fin) |
3 | symgbas.1 | . . . . 5 ⊢ 𝐺 = (SymGrp‘𝐴) | |
4 | symgbas.2 | . . . . 5 ⊢ 𝐵 = (Base‘𝐺) | |
5 | 3, 4 | symgbas 18493 | . . . 4 ⊢ 𝐵 = {𝑓 ∣ 𝑓:𝐴–1-1-onto→𝐴} |
6 | f1of 6609 | . . . . 5 ⊢ (𝑓:𝐴–1-1-onto→𝐴 → 𝑓:𝐴⟶𝐴) | |
7 | 6 | ss2abi 4042 | . . . 4 ⊢ {𝑓 ∣ 𝑓:𝐴–1-1-onto→𝐴} ⊆ {𝑓 ∣ 𝑓:𝐴⟶𝐴} |
8 | 5, 7 | eqsstri 4000 | . . 3 ⊢ 𝐵 ⊆ {𝑓 ∣ 𝑓:𝐴⟶𝐴} |
9 | mapvalg 8410 | . . . 4 ⊢ ((𝐴 ∈ Fin ∧ 𝐴 ∈ Fin) → (𝐴 ↑m 𝐴) = {𝑓 ∣ 𝑓:𝐴⟶𝐴}) | |
10 | 9 | anidms 569 | . . 3 ⊢ (𝐴 ∈ Fin → (𝐴 ↑m 𝐴) = {𝑓 ∣ 𝑓:𝐴⟶𝐴}) |
11 | 8, 10 | sseqtrrid 4019 | . 2 ⊢ (𝐴 ∈ Fin → 𝐵 ⊆ (𝐴 ↑m 𝐴)) |
12 | 2, 11 | ssfid 8735 | 1 ⊢ (𝐴 ∈ Fin → 𝐵 ∈ Fin) |
Colors of variables: wff setvar class |
Syntax hints: → wi 4 = wceq 1533 ∈ wcel 2110 {cab 2799 ⟶wf 6345 –1-1-onto→wf1o 6348 ‘cfv 6349 (class class class)co 7150 ↑m cmap 8400 Fincfn 8503 Basecbs 16477 SymGrpcsymg 18489 |
This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1792 ax-4 1806 ax-5 1907 ax-6 1966 ax-7 2011 ax-8 2112 ax-9 2120 ax-10 2141 ax-11 2157 ax-12 2173 ax-ext 2793 ax-sep 5195 ax-nul 5202 ax-pow 5258 ax-pr 5321 ax-un 7455 ax-cnex 10587 ax-resscn 10588 ax-1cn 10589 ax-icn 10590 ax-addcl 10591 ax-addrcl 10592 ax-mulcl 10593 ax-mulrcl 10594 ax-mulcom 10595 ax-addass 10596 ax-mulass 10597 ax-distr 10598 ax-i2m1 10599 ax-1ne0 10600 ax-1rid 10601 ax-rnegex 10602 ax-rrecex 10603 ax-cnre 10604 ax-pre-lttri 10605 ax-pre-lttrn 10606 ax-pre-ltadd 10607 ax-pre-mulgt0 10608 |
This theorem depends on definitions: df-bi 209 df-an 399 df-or 844 df-3or 1084 df-3an 1085 df-tru 1536 df-ex 1777 df-nf 1781 df-sb 2066 df-mo 2618 df-eu 2650 df-clab 2800 df-cleq 2814 df-clel 2893 df-nfc 2963 df-ne 3017 df-nel 3124 df-ral 3143 df-rex 3144 df-reu 3145 df-rab 3147 df-v 3496 df-sbc 3772 df-csb 3883 df-dif 3938 df-un 3940 df-in 3942 df-ss 3951 df-pss 3953 df-nul 4291 df-if 4467 df-pw 4540 df-sn 4561 df-pr 4563 df-tp 4565 df-op 4567 df-uni 4832 df-int 4869 df-iun 4913 df-br 5059 df-opab 5121 df-mpt 5139 df-tr 5165 df-id 5454 df-eprel 5459 df-po 5468 df-so 5469 df-fr 5508 df-we 5510 df-xp 5555 df-rel 5556 df-cnv 5557 df-co 5558 df-dm 5559 df-rn 5560 df-res 5561 df-ima 5562 df-pred 6142 df-ord 6188 df-on 6189 df-lim 6190 df-suc 6191 df-iota 6308 df-fun 6351 df-fn 6352 df-f 6353 df-f1 6354 df-fo 6355 df-f1o 6356 df-fv 6357 df-riota 7108 df-ov 7153 df-oprab 7154 df-mpo 7155 df-om 7575 df-1st 7683 df-2nd 7684 df-wrecs 7941 df-recs 8002 df-rdg 8040 df-1o 8096 df-2o 8097 df-oadd 8100 df-er 8283 df-map 8402 df-pm 8403 df-en 8504 df-dom 8505 df-sdom 8506 df-fin 8507 df-pnf 10671 df-mnf 10672 df-xr 10673 df-ltxr 10674 df-le 10675 df-sub 10866 df-neg 10867 df-nn 11633 df-2 11694 df-3 11695 df-4 11696 df-5 11697 df-6 11698 df-7 11699 df-8 11700 df-9 11701 df-n0 11892 df-z 11976 df-uz 12238 df-fz 12887 df-struct 16479 df-ndx 16480 df-slot 16481 df-base 16483 df-sets 16484 df-ress 16485 df-plusg 16572 df-tset 16578 df-efmnd 18028 df-symg 18490 |
This theorem is referenced by: mdetleib2 21191 mdetf 21198 mdetrlin 21205 mdetrsca 21206 mdetralt 21211 m2detleib 21234 smadiadetlem3 21271 smadiadet 21273 mdetpmtr1 31083 |
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