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Theorem cokex 4310
 Description: The Kuratowski composition of two sets is a set. (Contributed by SF, 14-Jan-2015.)
Hypotheses
Ref Expression
cokex.1
cokex.2
Assertion
Ref Expression
cokex k

Proof of Theorem cokex
StepHypRef Expression
1 cokex.1 . 2
2 cokex.2 . 2
3 cokexg 4309 . 2 k
41, 2, 3mp2an 653 1 k
 Colors of variables: wff setvar class Syntax hints:   wcel 1710  cvv 2859   k ccomk 4180 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-xp 4079  ax-cnv 4080  ax-1c 4081  ax-si 4083  ax-ins2 4084  ax-ins3 4085  ax-typlower 4086  ax-sn 4087 This theorem depends on definitions:  df-bi 177  df-or 359  df-an 360  df-3an 936  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-ral 2619  df-rex 2620  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-pw 3724  df-sn 3741  df-pr 3742  df-opk 4058  df-1c 4136  df-pw1 4137  df-xpk 4185  df-cnvk 4186  df-ins2k 4187  df-ins3k 4188  df-imak 4189  df-cok 4190  df-p6 4191  df-sik 4192 This theorem is referenced by:  nncex  4396  nnsucelrlem1  4424  opexg  4587  proj2exg  4592  setconslem5  4735  1stex  4739  swapex  4742
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