Theorem rabeqc 3443

Description: A restricted class abstraction equals the restricting class if its condition follows from the membership of the free setvar variable in the restricting class. (Contributed by AV, 20-Apr-2022.) (Proof shortened by SN, 15-Jan-2025.)

Hypothesis

Ref	Expression
rabeqc.1	⊢ (𝑥 ∈ 𝐴 → 𝜑)

Assertion

Ref	Expression
rabeqc	⊢ {𝑥 ∈ 𝐴 ∣ 𝜑} = 𝐴

Distinct variable group:   𝑥,𝐴

Allowed substitution hint:   𝜑(𝑥)

Proof of Theorem rabeqc

Step	Hyp	Ref	Expression
1		rabeqc.1	. . . 4 ⊢ (𝑥 ∈ 𝐴 → 𝜑)
2	1	adantl 481	. . 3 ⊢ ((⊤ ∧ 𝑥 ∈ 𝐴) → 𝜑)
3	2	rabeqcda 3442	. 2 ⊢ (⊤ → {𝑥 ∈ 𝐴 ∣ 𝜑} = 𝐴)
4	3	mptru 1547	1 ⊢ {𝑥 ∈ 𝐴 ∣ 𝜑} = 𝐴

Syntax hints:   → wi 4   = wceq 1540  ⊤wtru 1541   ∈ wcel 2105  {crab 3431

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 1912  ax-6 1970  ax-7 2010  ax-8 2107  ax-9 2115  ax-ext 2702

This theorem depends on definitions:  df-bi 206  df-an 396  df-tru 1543  df-ex 1781  df-sb 2067  df-clab 2709  df-cleq 2723  df-clel 2809  df-rab 3432

This theorem is referenced by:  bday0s  27673  2clwwlk2  30033  numclwwlk3lem2lem  30068  fply1  33076  elnanelprv  34883  ipolub0  47778  ipoglb0  47780