Theorem ss2rabd 4020

Description: Subclass of a restricted class abstraction (deduction form). Saves ax-10 2144, ax-11 2160, ax-12 2180 over using ss2rab 4017 and sylibr 234. (Contributed by SN, 4-Feb-2026.)

Hypothesis

Ref	Expression
ss2rabd.1	⊢ (𝜑 → ∀𝑥 ∈ 𝐴 (𝜓 → 𝜒))

Assertion

Ref	Expression
ss2rabd	⊢ (𝜑 → {𝑥 ∈ 𝐴 ∣ 𝜓} ⊆ {𝑥 ∈ 𝐴 ∣ 𝜒})

Proof of Theorem ss2rabd

Step	Hyp	Ref	Expression
1		ss2rabd.1	. . . 4 ⊢ (𝜑 → ∀𝑥 ∈ 𝐴 (𝜓 → 𝜒))
2		df-ral 3048	. . . . 5 ⊢ (∀𝑥 ∈ 𝐴 (𝜓 → 𝜒) ↔ ∀𝑥(𝑥 ∈ 𝐴 → (𝜓 → 𝜒)))
3		imdistan 567	. . . . . 6 ⊢ ((𝑥 ∈ 𝐴 → (𝜓 → 𝜒)) ↔ ((𝑥 ∈ 𝐴 ∧ 𝜓) → (𝑥 ∈ 𝐴 ∧ 𝜒)))
4	3	albii 1820	. . . . 5 ⊢ (∀𝑥(𝑥 ∈ 𝐴 → (𝜓 → 𝜒)) ↔ ∀𝑥((𝑥 ∈ 𝐴 ∧ 𝜓) → (𝑥 ∈ 𝐴 ∧ 𝜒)))
5	2, 4	bitri 275	. . . 4 ⊢ (∀𝑥 ∈ 𝐴 (𝜓 → 𝜒) ↔ ∀𝑥((𝑥 ∈ 𝐴 ∧ 𝜓) → (𝑥 ∈ 𝐴 ∧ 𝜒)))
6	1, 5	sylib 218	. . 3 ⊢ (𝜑 → ∀𝑥((𝑥 ∈ 𝐴 ∧ 𝜓) → (𝑥 ∈ 𝐴 ∧ 𝜒)))
7		ss2abim 4008	. . 3 ⊢ (∀𝑥((𝑥 ∈ 𝐴 ∧ 𝜓) → (𝑥 ∈ 𝐴 ∧ 𝜒)) → {𝑥 ∣ (𝑥 ∈ 𝐴 ∧ 𝜓)} ⊆ {𝑥 ∣ (𝑥 ∈ 𝐴 ∧ 𝜒)})
8	6, 7	syl 17	. 2 ⊢ (𝜑 → {𝑥 ∣ (𝑥 ∈ 𝐴 ∧ 𝜓)} ⊆ {𝑥 ∣ (𝑥 ∈ 𝐴 ∧ 𝜒)})
9		df-rab 3396	. 2 ⊢ {𝑥 ∈ 𝐴 ∣ 𝜓} = {𝑥 ∣ (𝑥 ∈ 𝐴 ∧ 𝜓)}
10		df-rab 3396	. 2 ⊢ {𝑥 ∈ 𝐴 ∣ 𝜒} = {𝑥 ∣ (𝑥 ∈ 𝐴 ∧ 𝜒)}
11	8, 9, 10	3sstr4g 3983	1 ⊢ (𝜑 → {𝑥 ∈ 𝐴 ∣ 𝜓} ⊆ {𝑥 ∈ 𝐴 ∣ 𝜒})

Syntax hints:   → wi 4   ∧ wa 395  ∀wal 1539   ∈ wcel 2111  {cab 2709  ∀wral 3047  {crab 3395   ⊆ wss 3897

This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1796  ax-4 1810  ax-5 1911  ax-6 1968  ax-7 2009  ax-9 2121  ax-ext 2703

This theorem depends on definitions:  df-bi 207  df-an 396  df-ex 1781  df-sb 2068  df-clab 2710  df-cleq 2723  df-ral 3048  df-rab 3396  df-ss 3914

This theorem is referenced by:  ss2rabdv  4023  ondomon  10460  xrlimcnp  26911  ss2rabdf  45252  pimiooltgt  46813