Theorem 19.2g 2058

Description: Theorem 19.2 of [Margaris] p. 89, generalized to use two setvar variables. Use 19.2 1892 when sufficient. (Contributed by Mel L. O'Cat, 31-Mar-2008.)

Assertion

Ref	Expression
19.2g	⊢ (∀𝑥𝜑 → ∃𝑦𝜑)

Proof of Theorem 19.2g

Step	Hyp	Ref	Expression
1		19.8a 2052	. 2 ⊢ (𝜑 → ∃𝑦𝜑)
2	1	sps 2055	1 ⊢ (∀𝑥𝜑 → ∃𝑦𝜑)

Syntax hints:   → wi 4  ∀wal 1481  ∃wex 1704

This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1722  ax-4 1737  ax-5 1839  ax-6 1888  ax-7 1935  ax-12 2047

This theorem depends on definitions:  df-bi 197  df-ex 1705

This theorem is referenced by: (None)