Theorem bnj1293 34813

Description: First-order logic and set theory. (Contributed by Jonathan Ben-Naim, 3-Jun-2011.) (New usage is discouraged.)

Hypothesis

Ref	Expression
bnj1293.1	⊢ 𝐴 = (𝐵 ∩ 𝐶)

Assertion

Ref	Expression
bnj1293	⊢ 𝐴 ⊆ 𝐶

Proof of Theorem bnj1293

Step	Hyp	Ref	Expression
1		bnj1293.1	. 2 ⊢ 𝐴 = (𝐵 ∩ 𝐶)
2		inss2 4204	. 2 ⊢ (𝐵 ∩ 𝐶) ⊆ 𝐶
3	1, 2	eqsstri 3996	1 ⊢ 𝐴 ⊆ 𝐶

Syntax hints:   = wceq 1540   ∩ cin 3916   ⊆ wss 3917

This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1795  ax-4 1809  ax-5 1910  ax-6 1967  ax-7 2008  ax-8 2111  ax-9 2119  ax-ext 2702

This theorem depends on definitions:  df-bi 207  df-an 396  df-tru 1543  df-ex 1780  df-sb 2066  df-clab 2709  df-cleq 2722  df-clel 2804  df-rab 3409  df-v 3452  df-in 3924  df-ss 3934

This theorem is referenced by:  bnj1253  35014  bnj1286  35016  bnj1280  35017  bnj1296  35018