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Mirrors > Home > MPE Home > Th. List > sygbasnfpfi | Structured version Visualization version GIF version |
Description: The class of non-fixed points of a permutation of a finite set is finite. (Contributed by AV, 13-Jan-2019.) |
Ref | Expression |
---|---|
psgnfvalfi.g | ⊢ 𝐺 = (SymGrp‘𝐷) |
psgnfvalfi.b | ⊢ 𝐵 = (Base‘𝐺) |
Ref | Expression |
---|---|
sygbasnfpfi | ⊢ ((𝐷 ∈ Fin ∧ 𝑃 ∈ 𝐵) → dom (𝑃 ∖ I ) ∈ Fin) |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | psgnfvalfi.g | . . . . . 6 ⊢ 𝐺 = (SymGrp‘𝐷) | |
2 | psgnfvalfi.b | . . . . . 6 ⊢ 𝐵 = (Base‘𝐺) | |
3 | 1, 2 | symgbasf 18504 | . . . . 5 ⊢ (𝑃 ∈ 𝐵 → 𝑃:𝐷⟶𝐷) |
4 | 3 | ffnd 6515 | . . . 4 ⊢ (𝑃 ∈ 𝐵 → 𝑃 Fn 𝐷) |
5 | 4 | adantl 484 | . . 3 ⊢ ((𝐷 ∈ Fin ∧ 𝑃 ∈ 𝐵) → 𝑃 Fn 𝐷) |
6 | fndifnfp 6938 | . . 3 ⊢ (𝑃 Fn 𝐷 → dom (𝑃 ∖ I ) = {𝑥 ∈ 𝐷 ∣ (𝑃‘𝑥) ≠ 𝑥}) | |
7 | 5, 6 | syl 17 | . 2 ⊢ ((𝐷 ∈ Fin ∧ 𝑃 ∈ 𝐵) → dom (𝑃 ∖ I ) = {𝑥 ∈ 𝐷 ∣ (𝑃‘𝑥) ≠ 𝑥}) |
8 | rabfi 8743 | . . 3 ⊢ (𝐷 ∈ Fin → {𝑥 ∈ 𝐷 ∣ (𝑃‘𝑥) ≠ 𝑥} ∈ Fin) | |
9 | 8 | adantr 483 | . 2 ⊢ ((𝐷 ∈ Fin ∧ 𝑃 ∈ 𝐵) → {𝑥 ∈ 𝐷 ∣ (𝑃‘𝑥) ≠ 𝑥} ∈ Fin) |
10 | 7, 9 | eqeltrd 2913 | 1 ⊢ ((𝐷 ∈ Fin ∧ 𝑃 ∈ 𝐵) → dom (𝑃 ∖ I ) ∈ Fin) |
Colors of variables: wff setvar class |
Syntax hints: → wi 4 ∧ wa 398 = wceq 1537 ∈ wcel 2114 ≠ wne 3016 {crab 3142 ∖ cdif 3933 I cid 5459 dom cdm 5555 Fn wfn 6350 ‘cfv 6355 Fincfn 8509 Basecbs 16483 SymGrpcsymg 18495 |
This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1796 ax-4 1810 ax-5 1911 ax-6 1970 ax-7 2015 ax-8 2116 ax-9 2124 ax-10 2145 ax-11 2161 ax-12 2177 ax-ext 2793 ax-sep 5203 ax-nul 5210 ax-pow 5266 ax-pr 5330 ax-un 7461 ax-cnex 10593 ax-resscn 10594 ax-1cn 10595 ax-icn 10596 ax-addcl 10597 ax-addrcl 10598 ax-mulcl 10599 ax-mulrcl 10600 ax-mulcom 10601 ax-addass 10602 ax-mulass 10603 ax-distr 10604 ax-i2m1 10605 ax-1ne0 10606 ax-1rid 10607 ax-rnegex 10608 ax-rrecex 10609 ax-cnre 10610 ax-pre-lttri 10611 ax-pre-lttrn 10612 ax-pre-ltadd 10613 ax-pre-mulgt0 10614 |
This theorem depends on definitions: df-bi 209 df-an 399 df-or 844 df-3or 1084 df-3an 1085 df-tru 1540 df-ex 1781 df-nf 1785 df-sb 2070 df-mo 2622 df-eu 2654 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 3773 df-csb 3884 df-dif 3939 df-un 3941 df-in 3943 df-ss 3952 df-pss 3954 df-nul 4292 df-if 4468 df-pw 4541 df-sn 4568 df-pr 4570 df-tp 4572 df-op 4574 df-uni 4839 df-int 4877 df-iun 4921 df-br 5067 df-opab 5129 df-mpt 5147 df-tr 5173 df-id 5460 df-eprel 5465 df-po 5474 df-so 5475 df-fr 5514 df-we 5516 df-xp 5561 df-rel 5562 df-cnv 5563 df-co 5564 df-dm 5565 df-rn 5566 df-res 5567 df-ima 5568 df-pred 6148 df-ord 6194 df-on 6195 df-lim 6196 df-suc 6197 df-iota 6314 df-fun 6357 df-fn 6358 df-f 6359 df-f1 6360 df-fo 6361 df-f1o 6362 df-fv 6363 df-riota 7114 df-ov 7159 df-oprab 7160 df-mpo 7161 df-om 7581 df-1st 7689 df-2nd 7690 df-wrecs 7947 df-recs 8008 df-rdg 8046 df-1o 8102 df-oadd 8106 df-er 8289 df-map 8408 df-en 8510 df-dom 8511 df-sdom 8512 df-fin 8513 df-pnf 10677 df-mnf 10678 df-xr 10679 df-ltxr 10680 df-le 10681 df-sub 10872 df-neg 10873 df-nn 11639 df-2 11701 df-3 11702 df-4 11703 df-5 11704 df-6 11705 df-7 11706 df-8 11707 df-9 11708 df-n0 11899 df-z 11983 df-uz 12245 df-fz 12894 df-struct 16485 df-ndx 16486 df-slot 16487 df-base 16489 df-sets 16490 df-ress 16491 df-plusg 16578 df-tset 16584 df-efmnd 18034 df-symg 18496 |
This theorem is referenced by: psgnfvalfi 18641 psgnvalfi 18642 psgnran 18643 psgnfieu 18646 psgnghm2 20725 cofipsgn 20737 psgndmfi 30740 |
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