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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 8704 | . . 3 ⊢ ω = (On ∩ Fin) | |
2 | inss2 4206 | . . 3 ⊢ (On ∩ Fin) ⊆ Fin | |
3 | 1, 2 | eqsstri 4001 | . 2 ⊢ ω ⊆ Fin |
4 | 3 | sseli 3963 | 1 ⊢ (𝐴 ∈ ω → 𝐴 ∈ Fin) |
Colors of variables: wff setvar class |
Syntax hints: → wi 4 ∈ wcel 2110 ∩ cin 3935 Oncon0 6186 ωcom 7574 Fincfn 8503 |
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 2156 ax-12 2172 ax-ext 2793 ax-sep 5196 ax-nul 5203 ax-pow 5259 ax-pr 5322 ax-un 7455 |
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 3497 df-sbc 3773 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 4562 df-pr 4564 df-tp 4566 df-op 4568 df-uni 4833 df-br 5060 df-opab 5122 df-tr 5166 df-id 5455 df-eprel 5460 df-po 5469 df-so 5470 df-fr 5509 df-we 5511 df-xp 5556 df-rel 5557 df-cnv 5558 df-co 5559 df-dm 5560 df-rn 5561 df-res 5562 df-ima 5563 df-ord 6189 df-on 6190 df-lim 6191 df-suc 6192 df-iota 6309 df-fun 6352 df-fn 6353 df-f 6354 df-f1 6355 df-fo 6356 df-f1o 6357 df-fv 6358 df-om 7575 df-er 8283 df-en 8504 df-dom 8505 df-sdom 8506 df-fin 8507 |
This theorem is referenced by: cardnn 9386 en2eqpr 9427 en2eleq 9428 infxpenlem 9433 dfac12k 9567 pwsdompw 9620 ackbij2lem1 9635 ackbij1lem3 9638 ackbij1lem5 9640 ackbij1lem14 9649 ackbij1b 9655 fin23lem23 9742 fin23lem22 9743 domtriomlem 9858 gchdju1 10072 gch2 10091 omina 10107 hashgval2 13733 hashdom 13734 hashp1i 13758 hash1snb 13774 hash2pr 13821 pr2pwpr 13831 hash3tr 13842 xpsfrnel 16829 symggen 18592 psgnunilem1 18615 lt6abl 19009 simpgnsgd 19216 znfld 20701 frgpcyg 20714 xpsmet 22986 xpsxms 23138 xpsms 23139 isppw 25685 unidifsnel 30289 unidifsnne 30290 finxpreclem4 34669 harinf 39624 frlmpwfi 39691 infordmin 39892 |
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