Theorem ralrab 2999

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

Hypothesis

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

Assertion

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

Distinct variable groups:   x,y   y,A   ψ,y

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

Proof of Theorem ralrab

Step	Hyp	Ref	Expression
1		ralab.1	. . . . 5 ⊢ (y = x → (φ ↔ ψ))
2	1	elrab 2995	. . . 4 ⊢ (x ∈ {y ∈ A ∣ φ} ↔ (x ∈ A ∧ ψ))
3	2	imbi1i 315	. . 3 ⊢ ((x ∈ {y ∈ A ∣ φ} → χ) ↔ ((x ∈ A ∧ ψ) → χ))
4		impexp 433	. . 3 ⊢ (((x ∈ A ∧ ψ) → χ) ↔ (x ∈ A → (ψ → χ)))
5	3, 4	bitri 240	. 2 ⊢ ((x ∈ {y ∈ A ∣ φ} → χ) ↔ (x ∈ A → (ψ → χ)))
6	5	ralbii2 2643	1 ⊢ (∀x ∈ {y ∈ A ∣ φ}χ ↔ ∀x ∈ A (ψ → χ))

This proof depends on syntax axioms:   → wi 4   ↔ wb 176   ∧ wa 358   ∈ wcel 1710  ∀wral 2615  {crab 2619

This proof depends on 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 proof 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-rab 2624  df-v 2862

This theorem is used by: (None)