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Theorem a1tru 1330
Description: Anything implies . (Contributed by FL, 20-Mar-2011.) (Proof shortened by Anthony Hart, 1-Aug-2011.)
Assertion
Ref Expression
a1tru

Proof of Theorem a1tru
StepHypRef Expression
1 tru 1321 . 2
21a1i 10 1
Colors of variables: wff setvar class
Syntax hints:   wi 4   wtru 1316
This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8
This theorem depends on definitions:  df-bi 177  df-tru 1319
This theorem is referenced by:  truan  1331
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