Theorem bj-rabtrALT 35257

Description: Alternate proof of bj-rabtr 35256. (Contributed by BJ, 22-Apr-2019.) (Proof modification is discouraged.) (New usage is discouraged.)

Assertion

Ref	Expression
bj-rabtrALT	⊢ {𝑥 ∈ 𝐴 ∣ ⊤} = 𝐴

Distinct variable group:   𝑥,𝐴

Proof of Theorem bj-rabtrALT

Step	Hyp	Ref	Expression
1		nfrab1 3422	. . 3 ⊢ Ⅎ𝑥{𝑥 ∈ 𝐴 ∣ ⊤}
2		nfcv 2904	. . 3 ⊢ Ⅎ𝑥𝐴
3	1, 2	cleqf 2935	. 2 ⊢ ({𝑥 ∈ 𝐴 ∣ ⊤} = 𝐴 ↔ ∀𝑥(𝑥 ∈ {𝑥 ∈ 𝐴 ∣ ⊤} ↔ 𝑥 ∈ 𝐴))
4		tru 1544	. . 3 ⊢ ⊤
5		rabid 3423	. . 3 ⊢ (𝑥 ∈ {𝑥 ∈ 𝐴 ∣ ⊤} ↔ (𝑥 ∈ 𝐴 ∧ ⊤))
6	4, 5	mpbiran2 707	. 2 ⊢ (𝑥 ∈ {𝑥 ∈ 𝐴 ∣ ⊤} ↔ 𝑥 ∈ 𝐴)
7	3, 6	mpgbir 1800	1 ⊢ {𝑥 ∈ 𝐴 ∣ ⊤} = 𝐴

Syntax hints:   ↔ wb 205   = wceq 1540  ⊤wtru 1541   ∈ wcel 2105  {crab 3403

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-10 2136  ax-11 2153  ax-12 2170  ax-ext 2707

This theorem depends on definitions:  df-bi 206  df-an 397  df-or 845  df-tru 1543  df-ex 1781  df-nf 1785  df-sb 2067  df-clab 2714  df-cleq 2728  df-clel 2814  df-nfc 2886  df-rab 3404

This theorem is referenced by: (None)