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Theorem bnj31 34221
Description: First-order logic and set theory. (Contributed by Jonathan Ben-Naim, 3-Jun-2011.) (New usage is discouraged.)
Hypotheses
Ref Expression
bnj31.1 (𝜑 → ∃𝑥𝐴 𝜓)
bnj31.2 (𝜓𝜒)
Assertion
Ref Expression
bnj31 (𝜑 → ∃𝑥𝐴 𝜒)

Proof of Theorem bnj31
StepHypRef Expression
1 bnj31.1 . 2 (𝜑 → ∃𝑥𝐴 𝜓)
2 bnj31.2 . . 3 (𝜓𝜒)
32reximi 3076 . 2 (∃𝑥𝐴 𝜓 → ∃𝑥𝐴 𝜒)
41, 3syl 17 1 (𝜑 → ∃𝑥𝐴 𝜒)
Colors of variables: wff setvar class
Syntax hints:  wi 4  wrex 3062
This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1789  ax-4 1803
This theorem depends on definitions:  df-bi 206  df-an 396  df-ex 1774  df-rex 3063
This theorem is referenced by:  bnj168  34232  bnj110  34360  bnj906  34432  bnj1253  34519  bnj1280  34522  bnj1296  34523  bnj1371  34531  bnj1497  34562  bnj1498  34563  bnj1501  34569
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