Theorem ralab 2998

Description: Universal quantification over a class abstraction. (Contributed by Jeff Madsen, 10-Jun-2010.)

Hypothesis

Ref	Expression
ralab.1	⊢ (y = x → (φ ↔ ψ))

Assertion

Ref	Expression
ralab	⊢ (∀x ∈ {y ∣ φ}χ ↔ ∀x(ψ → χ))

Distinct variable groups:   x,y   ψ,y

Allowed substitution hints:   φ(x,y)   ψ(x)   χ(x,y)

Proof of Theorem ralab

Step	Hyp	Ref	Expression
1		df-ral 2620	. 2 ⊢ (∀x ∈ {y ∣ φ}χ ↔ ∀x(x ∈ {y ∣ φ} → χ))
2		vex 2863	. . . . 5 ⊢ x ∈ V
3		ralab.1	. . . . 5 ⊢ (y = x → (φ ↔ ψ))
4	2, 3	elab 2986	. . . 4 ⊢ (x ∈ {y ∣ φ} ↔ ψ)
5	4	imbi1i 315	. . 3 ⊢ ((x ∈ {y ∣ φ} → χ) ↔ (ψ → χ))
6	5	albii 1566	. 2 ⊢ (∀x(x ∈ {y ∣ φ} → χ) ↔ ∀x(ψ → χ))
7	1, 6	bitri 240	1 ⊢ (∀x ∈ {y ∣ φ}χ ↔ ∀x(ψ → χ))

Syntax hints:   → wi 4   ↔ wb 176  ∀wal 1540   ∈ wcel 1710  {cab 2339  ∀wral 2615

This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1546  ax-5 1557  ax-17 1616  ax-9 1654  ax-8 1675  ax-6 1729  ax-7 1734  ax-11 1746  ax-12 1925  ax-ext 2334

This theorem depends on definitions:  df-bi 177  df-or 359  df-an 360  df-tru 1319  df-ex 1542  df-nf 1545  df-sb 1649  df-clab 2340  df-cleq 2346  df-clel 2349  df-nfc 2479  df-ral 2620  df-v 2862

This theorem is referenced by:  nnadjoinpw  4522  funcnvuni  5162  frds  5936