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Mirrors > Home > NFE Home > Th. List > opkex | GIF version |
Description: A Kuratowski ordered pair exists. (Contributed by SF, 12-Jan-2015.) |
Ref | Expression |
---|---|
opkex | ⊢ ⟪A, B⟫ ∈ V |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | df-opk 4058 | . 2 ⊢ ⟪A, B⟫ = {{A}, {A, B}} | |
2 | prex 4112 | . 2 ⊢ {{A}, {A, B}} ∈ V | |
3 | 1, 2 | eqeltri 2423 | 1 ⊢ ⟪A, B⟫ ∈ V |
Colors of variables: wff setvar class |
Syntax hints: ∈ wcel 1710 Vcvv 2859 {csn 3737 {cpr 3738 ⟪copk 4057 |
This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1546 ax-5 1557 ax-17 1616 ax-9 1654 ax-8 1675 ax-6 1729 ax-7 1734 ax-11 1746 ax-12 1925 ax-ext 2334 ax-nin 4078 ax-sn 4087 |
This theorem depends on definitions: df-bi 177 df-or 359 df-an 360 df-nan 1288 df-tru 1319 df-ex 1542 df-nf 1545 df-sb 1649 df-clab 2340 df-cleq 2346 df-clel 2349 df-nfc 2478 df-ne 2518 df-v 2861 df-nin 3211 df-compl 3212 df-in 3213 df-un 3214 df-dif 3215 df-ss 3259 df-nul 3551 df-sn 3741 df-pr 3742 df-opk 4058 |
This theorem is referenced by: elxpk 4196 ssrelk 4211 eqrelk 4212 opkelopkabg 4245 otkelins2kg 4253 otkelins3kg 4254 opkelcokg 4261 opkelimagekg 4271 ins2kss 4279 ins3kss 4280 sikexlem 4295 dfimak2 4298 insklem 4304 ins2kexg 4305 ins3kexg 4306 dfint3 4318 ndisjrelk 4323 dfaddc2 4381 nnsucelrlem1 4424 nndisjeq 4429 ltfinex 4464 eqpwrelk 4478 eqpw1relk 4479 ncfinraiselem2 4480 ncfinlowerlem1 4482 eqtfinrelk 4486 evenfinex 4503 oddfinex 4504 evenodddisjlem1 4515 nnadjoinlem1 4519 nnpweqlem1 4522 srelk 4524 sfintfinlem1 4531 tfinnnlem1 4533 spfinex 4537 dfop2lem1 4573 setconslem2 4732 setconslem3 4733 setconslem4 4734 setconslem7 4737 df1st2 4738 dfswap2 4741 |
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