Theorem difin0 3524

Description: The difference of a class from its intersection is empty. Theorem 37 of [Suppes] p. 29. (Contributed by NM, 17-Aug-2004.) (Proof shortened by Andrew Salmon, 26-Jun-2011.)

Assertion

Ref	Expression
difin0	|- ( ( A i^i B ) \ B ) = (/)

Proof of Theorem difin0

Step	Hyp	Ref	Expression
1		inss2 3384	. 2 |- ( A i^i B ) C_ B
2		ssdif0im 3515	. 2 |- ( ( A i^i B ) C_ B -> ( ( A i^i B ) \ B ) = (/) )
3	1, 2	ax-mp 5	1 |- ( ( A i^i B ) \ B ) = (/)

Syntax hints:   = wceq 1364   \ cdif 3154   i^i cin 3156   C_ wss 3157   (/)c0 3450

This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-ia1 106  ax-ia2 107  ax-ia3 108  ax-in1 615  ax-in2 616  ax-io 710  ax-5 1461  ax-7 1462  ax-gen 1463  ax-ie1 1507  ax-ie2 1508  ax-8 1518  ax-10 1519  ax-11 1520  ax-i12 1521  ax-bndl 1523  ax-4 1524  ax-17 1540  ax-i9 1544  ax-ial 1548  ax-i5r 1549  ax-ext 2178

This theorem depends on definitions:  df-bi 117  df-tru 1367  df-nf 1475  df-sb 1777  df-clab 2183  df-cleq 2189  df-clel 2192  df-nfc 2328  df-v 2765  df-dif 3159  df-in 3163  df-ss 3170  df-nul 3451

This theorem is referenced by: (None)