Theorem abanssr 4266

Description: A class abstraction with a conjunction is a subset of the class abstraction with the right conjunct only. (Contributed by AV, 7-Aug-2024.) (Proof shortened by SN, 22-Aug-2024.)

Assertion

Ref	Expression
abanssr	⊢ {𝑓 ∣ (𝜑 ∧ 𝜓)} ⊆ {𝑓 ∣ 𝜓}

Proof of Theorem abanssr

Step	Hyp	Ref	Expression
1		simpr 488	. 2 ⊢ ((𝜑 ∧ 𝜓) → 𝜓)
2	1	ss2abi 4021	1 ⊢ {𝑓 ∣ (𝜑 ∧ 𝜓)} ⊆ {𝑓 ∣ 𝜓}

Syntax hints:   ∧ wa 399  {cab 2742   ⊆ wss 3906

This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1817  ax-4 1831  ax-5 1932

This theorem depends on definitions:  df-bi 209  df-an 400  df-tru 1565  df-sb 2093  df-clab 2743  df-ss 3923

This theorem is referenced by:  hashf1lem1  14470