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Theorem nfima 4953
 Description: Bound-variable hypothesis builder for image. (Contributed by NM, 30-Dec-1996.) (Proof shortened by Andrew Salmon, 27-Aug-2011.)
Hypotheses
Ref Expression
nfima.1 xA
nfima.2 xB
Assertion
Ref Expression
nfima x(AB)

Proof of Theorem nfima
Dummy variables y z are mutually distinct and distinct from all other variables.
StepHypRef Expression
1 df-ima 4727 . 2 (AB) = {y z B zAy}
2 nfima.2 . . . 4 xB
3 nfcv 2489 . . . . 5 xz
4 nfima.1 . . . . 5 xA
5 nfcv 2489 . . . . 5 xy
63, 4, 5nfbr 4683 . . . 4 x zAy
72, 6nfrex 2669 . . 3 xz B zAy
87nfab 2493 . 2 x{y z B zAy}
91, 8nfcxfr 2486 1 x(AB)
 Colors of variables: wff setvar class Syntax hints:  {cab 2339  Ⅎwnfc 2476  ∃wrex 2615   class class class wbr 4639   “ cima 4722 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-op 4566  df-br 4640  df-ima 4727 This theorem is referenced by:  nfimad  4954  csbima12g  4955  nfrn  4963
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