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Theorem dfimafn2 5923
Description: Alternate definition of the image of a function as an indexed union of singletons of function values. (Contributed by Raph Levien, 20-Nov-2006.)
Assertion
Ref Expression
dfimafn2
Distinct variable groups:   ,   ,

Proof of Theorem dfimafn2
Dummy variable is distinct from all other variables.
StepHypRef Expression
1 dfimafn 5922 . . 3
2 iunab 4376 . . 3
31, 2syl6eqr 2516 . 2
4 df-sn 4030 . . . . 5
5 eqcom 2466 . . . . . 6
65abbii 2591 . . . . 5
74, 6eqtri 2486 . . . 4
87a1i 11 . . 3
98iuneq2i 4349 . 2
103, 9syl6eqr 2516 1
Colors of variables: wff setvar class
Syntax hints:  ->wi 4  /\wa 369  =wceq 1395  e.wcel 1818  {cab 2442  E.wrex 2808  C_wss 3475  {csn 4029  U_ciun 4330  domcdm 5004  "cima 5007  Funwfun 5587  `cfv 5593
This theorem is referenced by:  uniiccdif  21987
This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1618  ax-4 1631  ax-5 1704  ax-6 1747  ax-7 1790  ax-9 1822  ax-10 1837  ax-11 1842  ax-12 1854  ax-13 1999  ax-ext 2435  ax-sep 4573  ax-nul 4581  ax-pr 4691
This theorem depends on definitions:  df-bi 185  df-or 370  df-an 371  df-3an 975  df-tru 1398  df-ex 1613  df-nf 1617  df-sb 1740  df-eu 2286  df-mo 2287  df-clab 2443  df-cleq 2449  df-clel 2452  df-nfc 2607  df-ne 2654  df-ral 2812  df-rex 2813  df-rab 2816  df-v 3111  df-sbc 3328  df-dif 3478  df-un 3480  df-in 3482  df-ss 3489  df-nul 3785  df-if 3942  df-sn 4030  df-pr 4032  df-op 4036  df-uni 4250  df-iun 4332  df-br 4453  df-opab 4511  df-id 4800  df-xp 5010  df-rel 5011  df-cnv 5012  df-co 5013  df-dm 5014  df-rn 5015  df-res 5016  df-ima 5017  df-iota 5556  df-fun 5595  df-fn 5596  df-fv 5601
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