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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 4059 | . 2 ⊢ ⟪A, B⟫ = {{A}, {A, B}} | |
2 | prex 4113 | . 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 2860 {csn 3738 {cpr 3739 ⟪copk 4058 |
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 4079 ax-sn 4088 |
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 2479 df-ne 2519 df-v 2862 df-nin 3212 df-compl 3213 df-in 3214 df-un 3215 df-dif 3216 df-ss 3260 df-nul 3552 df-sn 3742 df-pr 3743 df-opk 4059 |
This theorem is referenced by: elxpk 4197 ssrelk 4212 eqrelk 4213 opkelopkabg 4246 otkelins2kg 4254 otkelins3kg 4255 opkelcokg 4262 opkelimagekg 4272 ins2kss 4280 ins3kss 4281 sikexlem 4296 dfimak2 4299 insklem 4305 ins2kexg 4306 ins3kexg 4307 dfint3 4319 ndisjrelk 4324 dfaddc2 4382 nnsucelrlem1 4425 nndisjeq 4430 ltfinex 4465 eqpwrelk 4479 eqpw1relk 4480 ncfinraiselem2 4481 ncfinlowerlem1 4483 eqtfinrelk 4487 evenfinex 4504 oddfinex 4505 evenodddisjlem1 4516 nnadjoinlem1 4520 nnpweqlem1 4523 srelk 4525 sfintfinlem1 4532 tfinnnlem1 4534 spfinex 4538 dfop2lem1 4574 setconslem2 4733 setconslem3 4734 setconslem4 4735 setconslem7 4738 df1st2 4739 dfswap2 4742 |
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