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Mirrors > Home > MPE Home > Th. List > prfi | Structured version Visualization version GIF version |
Description: An unordered pair is finite. (Contributed by NM, 22-Aug-2008.) |
Ref | Expression |
---|---|
prfi | ⊢ {𝐴, 𝐵} ∈ Fin |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | df-pr 4570 | . 2 ⊢ {𝐴, 𝐵} = ({𝐴} ∪ {𝐵}) | |
2 | snfi 8594 | . . 3 ⊢ {𝐴} ∈ Fin | |
3 | snfi 8594 | . . 3 ⊢ {𝐵} ∈ Fin | |
4 | unfi 8785 | . . 3 ⊢ (({𝐴} ∈ Fin ∧ {𝐵} ∈ Fin) → ({𝐴} ∪ {𝐵}) ∈ Fin) | |
5 | 2, 3, 4 | mp2an 690 | . 2 ⊢ ({𝐴} ∪ {𝐵}) ∈ Fin |
6 | 1, 5 | eqeltri 2909 | 1 ⊢ {𝐴, 𝐵} ∈ Fin |
Colors of variables: wff setvar class |
Syntax hints: ∈ wcel 2114 ∪ cun 3934 {csn 4567 {cpr 4569 Fincfn 8509 |
This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1796 ax-4 1810 ax-5 1911 ax-6 1970 ax-7 2015 ax-8 2116 ax-9 2124 ax-10 2145 ax-11 2161 ax-12 2177 ax-ext 2793 ax-sep 5203 ax-nul 5210 ax-pow 5266 ax-pr 5330 ax-un 7461 |
This theorem depends on definitions: df-bi 209 df-an 399 df-or 844 df-3or 1084 df-3an 1085 df-tru 1540 df-ex 1781 df-nf 1785 df-sb 2070 df-mo 2622 df-eu 2654 df-clab 2800 df-cleq 2814 df-clel 2893 df-nfc 2963 df-ne 3017 df-ral 3143 df-rex 3144 df-reu 3145 df-rab 3147 df-v 3496 df-sbc 3773 df-csb 3884 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 4568 df-pr 4570 df-tp 4572 df-op 4574 df-uni 4839 df-int 4877 df-iun 4921 df-br 5067 df-opab 5129 df-mpt 5147 df-tr 5173 df-id 5460 df-eprel 5465 df-po 5474 df-so 5475 df-fr 5514 df-we 5516 df-xp 5561 df-rel 5562 df-cnv 5563 df-co 5564 df-dm 5565 df-rn 5566 df-res 5567 df-ima 5568 df-pred 6148 df-ord 6194 df-on 6195 df-lim 6196 df-suc 6197 df-iota 6314 df-fun 6357 df-fn 6358 df-f 6359 df-f1 6360 df-fo 6361 df-f1o 6362 df-fv 6363 df-ov 7159 df-oprab 7160 df-mpo 7161 df-om 7581 df-wrecs 7947 df-recs 8008 df-rdg 8046 df-1o 8102 df-oadd 8106 df-er 8289 df-en 8510 df-fin 8513 |
This theorem is referenced by: tpfi 8794 fiint 8795 inelfi 8882 tskpr 10192 hashpw 13798 hashfun 13799 pr2pwpr 13838 hashtpg 13844 sumpr 15103 lcmfpr 15971 prmreclem2 16253 acsfn2 16934 isdrs2 17549 efmnd2hash 18059 symg2hash 18520 psgnprfval 18649 gsumpr 19075 znidomb 20708 m2detleib 21240 ovolioo 24169 i1f1 24291 itgioo 24416 limcun 24493 aannenlem2 24918 wilthlem2 25646 perfectlem2 25806 upgrex 26877 ex-hash 28232 prodpr 30542 linds2eq 30941 inelpisys 31413 coinfliplem 31736 coinflippv 31741 subfacp1lem1 32426 poimirlem9 34916 kelac2lem 39684 sumpair 41312 refsum2cnlem1 41314 climxlim2lem 42146 ibliooicc 42276 fourierdlem50 42461 fourierdlem51 42462 fourierdlem54 42465 fourierdlem70 42481 fourierdlem71 42482 fourierdlem76 42487 fourierdlem102 42513 fourierdlem103 42514 fourierdlem104 42515 fourierdlem114 42525 saluncl 42622 sge0pr 42696 meadjun 42764 omeunle 42818 perfectALTVlem2 43907 zlmodzxzel 44423 ldepspr 44548 zlmodzxzldeplem2 44576 rrx2line 44747 2sphere 44756 |
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