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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 9094 | . . . 4 ⊢ ((𝐵 ∈ Fin ∧ 𝐴 ∈ Fin) → (𝐵 × 𝐴) ∈ Fin) | |
2 | 1 | ancoms 459 | . . 3 ⊢ ((𝐴 ∈ Fin ∧ 𝐵 ∈ Fin) → (𝐵 × 𝐴) ∈ Fin) |
3 | pwfi 8970 | . . 3 ⊢ ((𝐵 × 𝐴) ∈ Fin ↔ 𝒫 (𝐵 × 𝐴) ∈ Fin) | |
4 | 2, 3 | sylib 217 | . 2 ⊢ ((𝐴 ∈ Fin ∧ 𝐵 ∈ Fin) → 𝒫 (𝐵 × 𝐴) ∈ Fin) |
5 | mapsspw 8675 | . 2 ⊢ (𝐴 ↑m 𝐵) ⊆ 𝒫 (𝐵 × 𝐴) | |
6 | ssfi 8965 | . 2 ⊢ ((𝒫 (𝐵 × 𝐴) ∈ Fin ∧ (𝐴 ↑m 𝐵) ⊆ 𝒫 (𝐵 × 𝐴)) → (𝐴 ↑m 𝐵) ∈ Fin) | |
7 | 4, 5, 6 | sylancl 586 | 1 ⊢ ((𝐴 ∈ Fin ∧ 𝐵 ∈ Fin) → (𝐴 ↑m 𝐵) ∈ Fin) |
Colors of variables: wff setvar class |
Syntax hints: → wi 4 ∧ wa 396 ∈ wcel 2107 ⊆ wss 3888 𝒫 cpw 4534 × cxp 5588 (class class class)co 7284 ↑m cmap 8624 Fincfn 8742 |
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 1914 ax-6 1972 ax-7 2012 ax-8 2109 ax-9 2117 ax-10 2138 ax-11 2155 ax-12 2172 ax-ext 2710 ax-sep 5224 ax-nul 5231 ax-pow 5289 ax-pr 5353 ax-un 7597 |
This theorem depends on definitions: df-bi 206 df-an 397 df-or 845 df-3or 1087 df-3an 1088 df-tru 1542 df-fal 1552 df-ex 1783 df-nf 1787 df-sb 2069 df-mo 2541 df-eu 2570 df-clab 2717 df-cleq 2731 df-clel 2817 df-nfc 2890 df-ne 2945 df-ral 3070 df-rex 3071 df-reu 3073 df-rab 3074 df-v 3435 df-sbc 3718 df-csb 3834 df-dif 3891 df-un 3893 df-in 3895 df-ss 3905 df-pss 3907 df-nul 4258 df-if 4461 df-pw 4536 df-sn 4563 df-pr 4565 df-op 4569 df-uni 4841 df-iun 4927 df-br 5076 df-opab 5138 df-mpt 5159 df-tr 5193 df-id 5490 df-eprel 5496 df-po 5504 df-so 5505 df-fr 5545 df-we 5547 df-xp 5596 df-rel 5597 df-cnv 5598 df-co 5599 df-dm 5600 df-rn 5601 df-res 5602 df-ima 5603 df-ord 6273 df-on 6274 df-lim 6275 df-suc 6276 df-iota 6395 df-fun 6439 df-fn 6440 df-f 6441 df-f1 6442 df-fo 6443 df-f1o 6444 df-fv 6445 df-ov 7287 df-oprab 7288 df-mpo 7289 df-om 7722 df-1st 7840 df-2nd 7841 df-1o 8306 df-map 8626 df-pm 8627 df-en 8743 df-fin 8746 |
This theorem is referenced by: ixpfi 9125 hashmap 14159 hashpw 14160 hashf1lem2 14179 prmreclem2 16627 vdwlem10 16700 efmndbasfi 18525 symgbasfi 18995 aannenlem1 25497 birthdaylem1 26110 dchrfi 26412 reprfi 32605 deranglem 33137 poimirlem9 35795 poimirlem26 35812 poimirlem27 35813 poimirlem28 35814 poimirlem32 35818 dvnprodlem2 43495 etransclem16 43798 etransclem33 43815 |
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