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Mirrors > Home > MPE Home > Th. List > nnfi | Structured version Visualization version GIF version |
Description: Natural numbers are finite sets. (Contributed by Stefan O'Rear, 21-Mar-2015.) |
Ref | Expression |
---|---|
nnfi | ⊢ (𝐴 ∈ ω → 𝐴 ∈ Fin) |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | onfin2 8709 | . . 3 ⊢ ω = (On ∩ Fin) | |
2 | inss2 4205 | . . 3 ⊢ (On ∩ Fin) ⊆ Fin | |
3 | 1, 2 | eqsstri 4000 | . 2 ⊢ ω ⊆ Fin |
4 | 3 | sseli 3962 | 1 ⊢ (𝐴 ∈ ω → 𝐴 ∈ Fin) |
Colors of variables: wff setvar class |
Syntax hints: → wi 4 ∈ wcel 2110 ∩ cin 3934 Oncon0 6190 ωcom 7579 Fincfn 8508 |
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 5202 ax-nul 5209 ax-pow 5265 ax-pr 5329 ax-un 7460 |
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-ral 3143 df-rex 3144 df-rab 3147 df-v 3496 df-sbc 3772 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 4567 df-pr 4569 df-tp 4571 df-op 4573 df-uni 4838 df-br 5066 df-opab 5128 df-tr 5172 df-id 5459 df-eprel 5464 df-po 5473 df-so 5474 df-fr 5513 df-we 5515 df-xp 5560 df-rel 5561 df-cnv 5562 df-co 5563 df-dm 5564 df-rn 5565 df-res 5566 df-ima 5567 df-ord 6193 df-on 6194 df-lim 6195 df-suc 6196 df-iota 6313 df-fun 6356 df-fn 6357 df-f 6358 df-f1 6359 df-fo 6360 df-f1o 6361 df-fv 6362 df-om 7580 df-er 8288 df-en 8509 df-dom 8510 df-sdom 8511 df-fin 8512 |
This theorem is referenced by: cardnn 9391 en2eqpr 9432 en2eleq 9433 infxpenlem 9438 dfac12k 9572 pwsdompw 9625 ackbij2lem1 9640 ackbij1lem3 9643 ackbij1lem5 9645 ackbij1lem14 9654 ackbij1b 9660 fin23lem23 9747 fin23lem22 9748 domtriomlem 9863 gchdju1 10077 gch2 10096 omina 10112 hashgval2 13738 hashdom 13739 hashp1i 13763 hash1snb 13779 hash2pr 13826 pr2pwpr 13836 hash3tr 13847 xpsfrnel 16834 symggen 18597 psgnunilem1 18620 lt6abl 19014 simpgnsgd 19221 znfld 20706 frgpcyg 20719 xpsmet 22991 xpsxms 23143 xpsms 23144 isppw 25690 unidifsnel 30294 unidifsnne 30295 finxpreclem4 34674 harinf 39629 frlmpwfi 39696 infordmin 39897 |
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