Theorem bnj101 34699

Description: First-order logic and set theory. (Contributed by Jonathan Ben-Naim, 3-Jun-2011.) (New usage is discouraged.)

Hypotheses

Ref	Expression
bnj101.1	⊢ ∃𝑥𝜑
bnj101.2	⊢ (𝜑 → 𝜓)

Assertion

Ref	Expression
bnj101	⊢ ∃𝑥𝜓

Proof of Theorem bnj101

Step	Hyp	Ref	Expression
1		bnj101.1	. 2 ⊢ ∃𝑥𝜑
2		bnj101.2	. 2 ⊢ (𝜑 → 𝜓)
3	1, 2	eximii 1835	1 ⊢ ∃𝑥𝜓

Syntax hints:   → wi 4  ∃wex 1777

This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1793  ax-4 1807

This theorem depends on definitions:  df-bi 207  df-ex 1778

This theorem is referenced by:  bnj1023  34756  bnj1098  34759  bnj1101  34760  bnj1109  34762  bnj1468  34822  bnj907  34943  bnj1110  34958  bnj1118  34960  bnj1128  34966  bnj1145  34969  bnj1172  34977  bnj1174  34979  bnj1176  34981