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Theorem nic-ich 1518
Description: Chained inference. (Contributed by Jeff Hoffman, 17-Nov-2007.) (Proof modification is discouraged.) (New usage is discouraged.)
Hypotheses
Ref Expression
nic-ich.1
nic-ich.2
Assertion
Ref Expression
nic-ich

Proof of Theorem nic-ich
StepHypRef Expression
1 nic-ich.2 . . 3
21nic-isw1 1513 . 2
3 nic-ich.1 . . 3
43nic-imp 1508 . 2
52, 4nic-mp 1504 1
Colors of variables: wff setvar class
Syntax hints:  -/\wnan 1343
This theorem is referenced by:  nic-idbl  1519  nic-luk1  1524
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 185  df-an 371  df-nan 1344
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