Theorem difin0 4405

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 4161	. 2 ⊢ (𝐴 ∩ 𝐵) ⊆ 𝐵
2		ssdif0 4295	. 2 ⊢ ((𝐴 ∩ 𝐵) ⊆ 𝐵 ↔ ((𝐴 ∩ 𝐵) ∖ 𝐵) = ∅)
3	1, 2	mpbi 233	1 ⊢ ((𝐴 ∩ 𝐵) ∖ 𝐵) = ∅

Syntax hints:   = wceq 1543   ∖ cdif 3881   ∩ cin 3883   ⊆ wss 3884  ∅c0 4254

This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1803  ax-4 1817  ax-5 1918  ax-6 1976  ax-7 2016  ax-8 2114  ax-9 2122  ax-ext 2710

This theorem depends on definitions:  df-bi 210  df-an 400  df-tru 1546  df-fal 1556  df-ex 1788  df-sb 2073  df-clab 2717  df-cleq 2731  df-clel 2818  df-rab 3073  df-v 3425  df-dif 3887  df-in 3891  df-ss 3901  df-nul 4255

This theorem is referenced by:  volinun  24590