MPE Home Metamath Proof Explorer < Previous   Next >
Nearby theorems
Mirrors  >  Home  >  MPE Home  >  Th. List  >  funcnv2 Structured version   Visualization version   GIF version

Theorem funcnv2 6424
Description: A simpler equivalence for single-rooted (see funcnv 6425). (Contributed by NM, 9-Aug-2004.)
Assertion
Ref Expression
funcnv2 (Fun 𝐴 ↔ ∀𝑦∃*𝑥 𝑥𝐴𝑦)
Distinct variable group:   𝑥,𝑦,𝐴

Proof of Theorem funcnv2
StepHypRef Expression
1 relcnv 5969 . . 3 Rel 𝐴
2 dffun6 6372 . . 3 (Fun 𝐴 ↔ (Rel 𝐴 ∧ ∀𝑦∃*𝑥 𝑦𝐴𝑥))
31, 2mpbiran 707 . 2 (Fun 𝐴 ↔ ∀𝑦∃*𝑥 𝑦𝐴𝑥)
4 vex 3499 . . . . 5 𝑦 ∈ V
5 vex 3499 . . . . 5 𝑥 ∈ V
64, 5brcnv 5755 . . . 4 (𝑦𝐴𝑥𝑥𝐴𝑦)
76mobii 2631 . . 3 (∃*𝑥 𝑦𝐴𝑥 ↔ ∃*𝑥 𝑥𝐴𝑦)
87albii 1820 . 2 (∀𝑦∃*𝑥 𝑦𝐴𝑥 ↔ ∀𝑦∃*𝑥 𝑥𝐴𝑦)
93, 8bitri 277 1 (Fun 𝐴 ↔ ∀𝑦∃*𝑥 𝑥𝐴𝑦)
Colors of variables: wff setvar class
Syntax hints:  wb 208  wal 1535  ∃*wmo 2620   class class class wbr 5068  ccnv 5556  Rel wrel 5562  Fun wfun 6351
This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1796  ax-4 1810  ax-5 1911  ax-6 1970  ax-7 2015  ax-8 2116  ax-9 2124  ax-10 2145  ax-11 2161  ax-12 2177  ax-ext 2795  ax-sep 5205  ax-nul 5212  ax-pr 5332
This theorem depends on definitions:  df-bi 209  df-an 399  df-or 844  df-3an 1085  df-tru 1540  df-ex 1781  df-nf 1785  df-sb 2070  df-mo 2622  df-eu 2654  df-clab 2802  df-cleq 2816  df-clel 2895  df-nfc 2965  df-ral 3145  df-rab 3149  df-v 3498  df-dif 3941  df-un 3943  df-in 3945  df-ss 3954  df-nul 4294  df-if 4470  df-sn 4570  df-pr 4572  df-op 4576  df-br 5069  df-opab 5131  df-id 5462  df-xp 5563  df-rel 5564  df-cnv 5565  df-co 5566  df-fun 6359
This theorem is referenced by:  funcnv  6425  fun2cnv  6427  fun11  6430  dff12  6576  1stconst  7797  2ndconst  7798
  Copyright terms: Public domain W3C validator