Theorem difin0 4380

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 ∩ 𝐵) ∖ 𝐵) = ∅

Proof of Theorem difin0

Step	Hyp	Ref	Expression
1		inss2 4156	. 2 ⊢ (𝐴 ∩ 𝐵) ⊆ 𝐵
2		ssdif0 4277	. 2 ⊢ ((𝐴 ∩ 𝐵) ⊆ 𝐵 ↔ ((𝐴 ∩ 𝐵) ∖ 𝐵) = ∅)
3	1, 2	mpbi 233	1 ⊢ ((𝐴 ∩ 𝐵) ∖ 𝐵) = ∅

Syntax hints:   = wceq 1538   ∖ cdif 3878   ∩ cin 3880   ⊆ wss 3881  ∅c0 4243

This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1797  ax-4 1811  ax-5 1911  ax-6 1970  ax-7 2015  ax-8 2113  ax-9 2121  ax-ext 2770

This theorem depends on definitions:  df-bi 210  df-an 400  df-tru 1541  df-ex 1782  df-sb 2070  df-clab 2777  df-cleq 2791  df-clel 2870  df-rab 3115  df-v 3443  df-dif 3884  df-in 3888  df-ss 3898  df-nul 4244

This theorem is referenced by:  volinun  24150