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| Mirrors > Home > MPE Home > Th. List > fict | Structured version Visualization version GIF version | ||
| Description: A finite set is countable (weaker version of isfinite 9581). (Contributed by Thierry Arnoux, 27-Mar-2018.) |
| Ref | Expression |
|---|---|
| fict | ⊢ (𝐴 ∈ Fin → 𝐴 ≼ ω) |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | isfinite 9581 | . 2 ⊢ (𝐴 ∈ Fin ↔ 𝐴 ≺ ω) | |
| 2 | sdomdom 8928 | . 2 ⊢ (𝐴 ≺ ω → 𝐴 ≼ ω) | |
| 3 | 1, 2 | sylbi 217 | 1 ⊢ (𝐴 ∈ Fin → 𝐴 ≼ ω) |
| Colors of variables: wff setvar class |
| Syntax hints: → wi 4 ∈ wcel 2109 class class class wbr 5102 ωcom 7822 ≼ cdom 8893 ≺ csdm 8894 Fincfn 8895 |
| This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1795 ax-4 1809 ax-5 1910 ax-6 1967 ax-7 2008 ax-8 2111 ax-9 2119 ax-10 2142 ax-11 2158 ax-12 2178 ax-ext 2701 ax-sep 5246 ax-nul 5256 ax-pow 5315 ax-pr 5382 ax-un 7691 ax-inf2 9570 |
| This theorem depends on definitions: df-bi 207 df-an 396 df-or 848 df-3or 1087 df-3an 1088 df-tru 1543 df-fal 1553 df-ex 1780 df-nf 1784 df-sb 2066 df-mo 2533 df-eu 2562 df-clab 2708 df-cleq 2721 df-clel 2803 df-nfc 2878 df-ne 2926 df-ral 3045 df-rex 3054 df-reu 3352 df-rab 3403 df-v 3446 df-sbc 3751 df-csb 3860 df-dif 3914 df-un 3916 df-in 3918 df-ss 3928 df-pss 3931 df-nul 4293 df-if 4485 df-pw 4561 df-sn 4586 df-pr 4588 df-op 4592 df-uni 4868 df-int 4907 df-iun 4953 df-br 5103 df-opab 5165 df-mpt 5184 df-tr 5210 df-id 5526 df-eprel 5531 df-po 5539 df-so 5540 df-fr 5584 df-we 5586 df-xp 5637 df-rel 5638 df-cnv 5639 df-co 5640 df-dm 5641 df-rn 5642 df-res 5643 df-ima 5644 df-pred 6262 df-ord 6323 df-on 6324 df-lim 6325 df-suc 6326 df-iota 6452 df-fun 6501 df-fn 6502 df-f 6503 df-f1 6504 df-fo 6505 df-f1o 6506 df-fv 6507 df-ov 7372 df-om 7823 df-2nd 7948 df-frecs 8237 df-wrecs 8268 df-recs 8317 df-rdg 8355 df-1o 8411 df-er 8648 df-en 8896 df-dom 8897 df-sdom 8898 df-fin 8899 |
| This theorem is referenced by: unirnfdomd 10496 cfpwsdom 10513 ovolfi 25371 fz1nnct 32699 sigaclfu 34082 sigapisys 34118 mpct 45168 salexct 46305 salexct3 46313 salgencntex 46314 salgensscntex 46315 hoimbllem 46601 |
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