Theorem unisym1 33775

Description: A symmetry with ∀.

See negsym1 33769 for more information. (Contributed by Anthony Hart, 4-Sep-2011.) (Proof shortened by Mario Carneiro, 11-Dec-2016.)

Assertion

Ref	Expression
unisym1	⊢ (∀𝑥∀𝑥⊥ → ∀𝑥𝜑)

Proof of Theorem unisym1

Step	Hyp	Ref	Expression
1		falim 1553	. . 3 ⊢ (⊥ → ∀𝑥𝜑)
2	1	sps 2183	. 2 ⊢ (∀𝑥⊥ → ∀𝑥𝜑)
3	2	sps 2183	1 ⊢ (∀𝑥∀𝑥⊥ → ∀𝑥𝜑)

Syntax hints:   → wi 4  ∀wal 1534  ⊥wfal 1548

This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1795  ax-4 1809  ax-5 1910  ax-6 1969  ax-7 2014  ax-12 2176

This theorem depends on definitions:  df-bi 209  df-tru 1539  df-fal 1549  df-ex 1780

This theorem is referenced by: (None)