New Foundations Explorer < Previous   Next > Nearby theorems Mirrors  >  Home  >  NFE Home  >  Th. List  >  dfevenfin2 Unicode version

Theorem dfevenfin2 4512
 Description: Alternate definition of even number. (Contributed by SF, 25-Jan-2015.)
Assertion
Ref Expression
dfevenfin2 Evenfin Nn
Distinct variable group:   ,

Proof of Theorem dfevenfin2
StepHypRef Expression
1 df-evenfin 4444 . 2 Evenfin Nn
2 r19.41v 2764 . . . 4 Nn Nn
3 neeq1 2524 . . . . . 6
43pm5.32i 618 . . . . 5
54rexbii 2639 . . . 4 Nn Nn
62, 5bitr3i 242 . . 3 Nn Nn
76abbii 2465 . 2 Nn Nn
81, 7eqtri 2373 1 Evenfin Nn
 Colors of variables: wff setvar class Syntax hints:   wa 358   wceq 1642  cab 2339   wne 2516  wrex 2615  c0 3550   Nn cnnc 4373   cplc 4375   Evenfin cevenfin 4436 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 This theorem depends on definitions:  df-bi 177  df-an 360  df-tru 1319  df-ex 1542  df-nf 1545  df-sb 1649  df-clab 2340  df-cleq 2346  df-ne 2518  df-rex 2620  df-evenfin 4444 This theorem is referenced by:  evenodddisj  4516
 Copyright terms: Public domain W3C validator