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Theorem 19.36i 1872
Description: Inference from Theorem 19.36 of [Margaris] p. 90. (Contributed by NM, 5-Aug-1993.)
Hypotheses
Ref Expression
19.36.1 xψ
19.36i.2 x(φψ)
Assertion
Ref Expression
19.36i (xφψ)

Proof of Theorem 19.36i
StepHypRef Expression
1 19.36i.2 . 2 x(φψ)
2 19.36.1 . . 3 xψ
3219.36 1871 . 2 (x(φψ) ↔ (xφψ))
41, 3mpbi 199 1 (xφψ)
Colors of variables: wff setvar class
Syntax hints:  wi 4  wal 1540  wex 1541  wnf 1544
This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1546  ax-5 1557  ax-17 1616  ax-9 1654  ax-8 1675  ax-6 1729  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:  19.36aiv  1897  vtoclf  2908
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