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Theorem 19.27v 1894
Description: Theorem 19.27 of [Margaris] p. 90. (Contributed by NM, 3-Jun-2004.)
Assertion
Ref Expression
19.27v (x(φ ψ) ↔ (xφ ψ))
Distinct variable group:   ψ,x
Allowed substitution hint:   φ(x)

Proof of Theorem 19.27v
StepHypRef Expression
1 nfv 1619 . 2 xψ
2119.27 1869 1 (x(φ ψ) ↔ (xφ ψ))
Colors of variables: wff setvar class
Syntax hints:  wb 176   wa 358  wal 1540
This theorem was proved from axioms:  ax-1 5  ax-2 6  ax-3 7  ax-mp 8  ax-gen 1546  ax-5 1557  ax-17 1616  ax-9 1654  ax-8 1675  ax-11 1746
This theorem depends on definitions:  df-bi 177  df-an 360  df-ex 1542  df-nf 1545
This theorem is referenced by:  dfuni12  4291
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