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Theorem bnj1213 30123
Description: First-order logic and set theory. (Contributed by Jonathan Ben-Naim, 3-Jun-2011.) (New usage is discouraged.)
Hypotheses
Ref Expression
bnj1213.1 𝐴𝐵
bnj1213.2 (𝜃𝑥𝐴)
Assertion
Ref Expression
bnj1213 (𝜃𝑥𝐵)

Proof of Theorem bnj1213
StepHypRef Expression
1 bnj1213.1 . 2 𝐴𝐵
2 bnj1213.2 . 2 (𝜃𝑥𝐴)
31, 2sseldi 3566 1 (𝜃𝑥𝐵)
Colors of variables: wff setvar class
Syntax hints:  wi 4  wcel 1977  wss 3540
This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1713  ax-4 1728  ax-5 1827  ax-6 1875  ax-7 1922  ax-10 2006  ax-11 2021  ax-12 2034  ax-13 2234  ax-ext 2590
This theorem depends on definitions:  df-bi 196  df-or 384  df-an 385  df-tru 1478  df-ex 1696  df-nf 1701  df-sb 1868  df-clab 2597  df-cleq 2603  df-clel 2606  df-in 3547  df-ss 3554
This theorem is referenced by:  bnj1212  30124  bnj1173  30324  bnj1296  30343  bnj1408  30358  bnj1452  30374  bnj1523  30393
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