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Mirrors > Home > MPE Home > Th. List > mapfi | Structured version Visualization version GIF version |
Description: Set exponentiation of finite sets is finite. (Contributed by Jeff Madsen, 19-Jun-2011.) |
Ref | Expression |
---|---|
mapfi | ⊢ ((𝐴 ∈ Fin ∧ 𝐵 ∈ Fin) → (𝐴 ↑m 𝐵) ∈ Fin) |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | xpfi 8807 | . . . 4 ⊢ ((𝐵 ∈ Fin ∧ 𝐴 ∈ Fin) → (𝐵 × 𝐴) ∈ Fin) | |
2 | 1 | ancoms 463 | . . 3 ⊢ ((𝐴 ∈ Fin ∧ 𝐵 ∈ Fin) → (𝐵 × 𝐴) ∈ Fin) |
3 | pwfi 8837 | . . 3 ⊢ ((𝐵 × 𝐴) ∈ Fin ↔ 𝒫 (𝐵 × 𝐴) ∈ Fin) | |
4 | 2, 3 | sylib 221 | . 2 ⊢ ((𝐴 ∈ Fin ∧ 𝐵 ∈ Fin) → 𝒫 (𝐵 × 𝐴) ∈ Fin) |
5 | mapsspw 8453 | . 2 ⊢ (𝐴 ↑m 𝐵) ⊆ 𝒫 (𝐵 × 𝐴) | |
6 | ssfi 8752 | . 2 ⊢ ((𝒫 (𝐵 × 𝐴) ∈ Fin ∧ (𝐴 ↑m 𝐵) ⊆ 𝒫 (𝐵 × 𝐴)) → (𝐴 ↑m 𝐵) ∈ Fin) | |
7 | 4, 5, 6 | sylancl 590 | 1 ⊢ ((𝐴 ∈ Fin ∧ 𝐵 ∈ Fin) → (𝐴 ↑m 𝐵) ∈ Fin) |
Colors of variables: wff setvar class |
Syntax hints: → wi 4 ∧ wa 400 ∈ wcel 2112 ⊆ wss 3854 𝒫 cpw 4487 × cxp 5515 (class class class)co 7143 ↑m cmap 8409 Fincfn 8520 |
This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1798 ax-4 1812 ax-5 1912 ax-6 1971 ax-7 2016 ax-8 2114 ax-9 2122 ax-10 2143 ax-11 2159 ax-12 2176 ax-ext 2730 ax-sep 5162 ax-nul 5169 ax-pow 5227 ax-pr 5291 ax-un 7452 |
This theorem depends on definitions: df-bi 210 df-an 401 df-or 846 df-3or 1086 df-3an 1087 df-tru 1542 df-fal 1552 df-ex 1783 df-nf 1787 df-sb 2071 df-mo 2558 df-eu 2589 df-clab 2737 df-cleq 2751 df-clel 2831 df-nfc 2899 df-ne 2950 df-ral 3073 df-rex 3074 df-reu 3075 df-rab 3077 df-v 3409 df-sbc 3694 df-csb 3802 df-dif 3857 df-un 3859 df-in 3861 df-ss 3871 df-pss 3873 df-nul 4222 df-if 4414 df-pw 4489 df-sn 4516 df-pr 4518 df-tp 4520 df-op 4522 df-uni 4792 df-int 4832 df-iun 4878 df-br 5026 df-opab 5088 df-mpt 5106 df-tr 5132 df-id 5423 df-eprel 5428 df-po 5436 df-so 5437 df-fr 5476 df-we 5478 df-xp 5523 df-rel 5524 df-cnv 5525 df-co 5526 df-dm 5527 df-rn 5528 df-res 5529 df-ima 5530 df-pred 6119 df-ord 6165 df-on 6166 df-lim 6167 df-suc 6168 df-iota 6287 df-fun 6330 df-fn 6331 df-f 6332 df-f1 6333 df-fo 6334 df-f1o 6335 df-fv 6336 df-ov 7146 df-oprab 7147 df-mpo 7148 df-om 7573 df-1st 7686 df-2nd 7687 df-wrecs 7950 df-recs 8011 df-rdg 8049 df-1o 8105 df-2o 8106 df-oadd 8109 df-er 8292 df-map 8411 df-pm 8412 df-en 8521 df-dom 8522 df-sdom 8523 df-fin 8524 |
This theorem is referenced by: ixpfi 8839 hashmap 13831 hashpw 13832 hashf1lem2 13851 prmreclem2 16293 vdwlem10 16366 efmndbasfi 18093 symgbasfi 18559 aannenlem1 25008 birthdaylem1 25621 dchrfi 25923 reprfi 32100 deranglem 32629 poimirlem9 35331 poimirlem26 35348 poimirlem27 35349 poimirlem28 35350 poimirlem32 35354 dvnprodlem2 42940 etransclem16 43243 etransclem33 43260 |
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