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| Mirrors > Home > MPE Home > Th. List > isfinite | Structured version Visualization version GIF version | ||
| Description: A set is finite iff it is strictly dominated by the class of natural number. Theorem 42 of [Suppes] p. 151. The Axiom of Infinity is used for the forward implication. (Contributed by FL, 16-Apr-2011.) |
| Ref | Expression |
|---|---|
| isfinite | ⊢ (𝐴 ∈ Fin ↔ 𝐴 ≺ ω) |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | omex 9558 | . 2 ⊢ ω ∈ V | |
| 2 | isfiniteg 9204 | . 2 ⊢ (ω ∈ V → (𝐴 ∈ Fin ↔ 𝐴 ≺ ω)) | |
| 3 | 1, 2 | ax-mp 5 | 1 ⊢ (𝐴 ∈ Fin ↔ 𝐴 ≺ ω) |
| Colors of variables: wff setvar class |
| Syntax hints: ↔ wb 206 ∈ wcel 2114 Vcvv 3430 class class class wbr 5086 ωcom 7811 ≺ csdm 8886 Fincfn 8887 |
| This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1797 ax-4 1811 ax-5 1912 ax-6 1969 ax-7 2010 ax-8 2116 ax-9 2124 ax-10 2147 ax-11 2163 ax-12 2185 ax-ext 2709 ax-sep 5232 ax-nul 5242 ax-pow 5303 ax-pr 5371 ax-un 7683 ax-inf2 9556 |
| This theorem depends on definitions: df-bi 207 df-an 396 df-or 849 df-3or 1088 df-3an 1089 df-tru 1545 df-fal 1555 df-ex 1782 df-nf 1786 df-sb 2069 df-mo 2540 df-eu 2570 df-clab 2716 df-cleq 2729 df-clel 2812 df-nfc 2886 df-ne 2934 df-ral 3053 df-rex 3063 df-reu 3344 df-rab 3391 df-v 3432 df-sbc 3730 df-csb 3839 df-dif 3893 df-un 3895 df-in 3897 df-ss 3907 df-pss 3910 df-nul 4275 df-if 4468 df-pw 4544 df-sn 4569 df-pr 4571 df-op 4575 df-uni 4852 df-int 4891 df-iun 4936 df-br 5087 df-opab 5149 df-mpt 5168 df-tr 5194 df-id 5520 df-eprel 5525 df-po 5533 df-so 5534 df-fr 5578 df-we 5580 df-xp 5631 df-rel 5632 df-cnv 5633 df-co 5634 df-dm 5635 df-rn 5636 df-res 5637 df-ima 5638 df-pred 6260 df-ord 6321 df-on 6322 df-lim 6323 df-suc 6324 df-iota 6449 df-fun 6495 df-fn 6496 df-f 6497 df-f1 6498 df-fo 6499 df-f1o 6500 df-fv 6501 df-ov 7364 df-om 7812 df-2nd 7937 df-frecs 8225 df-wrecs 8256 df-recs 8305 df-rdg 8343 df-1o 8399 df-er 8637 df-en 8888 df-dom 8889 df-sdom 8890 df-fin 8891 |
| This theorem is referenced by: fict 9568 infxpenlem 9929 pwsdompw 10119 cflim2 10179 axcc4dom 10357 domtriom 10359 fin41 10360 dominf 10361 dominfac 10490 canthp1lem2 10570 pwfseqlem3 10577 pwfseqlem4a 10578 pwfseqlem4 10579 gchpwdom 10587 gchaleph 10588 gchhar 10596 omina 10608 gchina 10616 tskpr 10687 rexpen 16189 odinf 19532 fctop2 22983 dis1stc 23477 iunmbl2 25537 dyadmbl 25580 f1ocnt 32891 sibfof 34503 pibt2 37750 mblfinlem1 37995 ovoliunnfl 38000 heiborlem3 38151 ctbnfien 43267 pellex 43284 numinfctb 43552 saluncl 46766 meadjun 46911 meaiunlelem 46917 omeunle 46965 |
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