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Theorem proj1ex 4593
 Description: The first projection of a set is a set. (Contributed by Scott Fenton, 16-Apr-2021.)
Hypothesis
Ref Expression
projex.1 A V
Assertion
Ref Expression
proj1ex Proj1 A V

Proof of Theorem proj1ex
StepHypRef Expression
1 projex.1 . 2 A V
2 proj1exg 4591 . 2 (A V → Proj1 A V)
31, 2ax-mp 5 1 Proj1 A V
 Colors of variables: wff setvar class Syntax hints:   ∈ wcel 1710  Vcvv 2859   Proj1 cproj1 4563 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-sset 4082  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-sbc 3047  df-nin 3211  df-compl 3212  df-in 3213  df-un 3214  df-dif 3215  df-symdif 3216  df-ss 3259  df-nul 3551  df-if 3663  df-pw 3724  df-sn 3741  df-pr 3742  df-uni 3892  df-int 3927  df-opk 4058  df-1c 4136  df-pw1 4137  df-uni1 4138  df-xpk 4185  df-cnvk 4186  df-ins2k 4187  df-ins3k 4188  df-imak 4189  df-cok 4190  df-p6 4191  df-sik 4192  df-ssetk 4193  df-imagek 4194  df-idk 4195  df-addc 4378  df-nnc 4379  df-phi 4565  df-proj1 4567 This theorem is referenced by:  xpvv  4843  ssrel  4844  1stfo  5505  2ndfo  5506  swapf1o  5511  otsnelsi3  5805  xpassenlem  6056  nncdiv3lem1  6275  fnfreclem2  6318
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