Theorem dfdif2 3484

Description: Alternate definition of class difference. (Contributed by NM, 25-Mar-2004.)

Assertion

Ref	Expression
dfdif2

Distinct variable groups:   ,   ,

Proof of Theorem dfdif2

Step	Hyp	Ref	Expression
1		df-dif 3478	. 2
2		df-rab 2816	. 2
3	1, 2	eqtr4i 2489	1

Syntax hints:  -.wn 3  /\wa 369  =wceq 1395  e.wcel 1818  {cab 2442  {crab 2811  \cdif 3472

This theorem is referenced by:  difeq1  3614  difeq2  3615  nfdif  3624  difidALT  3897  ordintdif  4932  kmlem3  8553  incexc2  13650  cnambfre  30063

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-ext 2435

This theorem depends on definitions:  df-bi 185  df-cleq 2449  df-rab 2816  df-dif 3478