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Theorem 3eqtr2i 2379
Description: An inference from three chained equalities. (Contributed by NM, 3-Aug-2006.)
Hypotheses
Ref Expression
3eqtr2i.1
3eqtr2i.2
3eqtr2i.3
Assertion
Ref Expression
3eqtr2i

Proof of Theorem 3eqtr2i
StepHypRef Expression
1 3eqtr2i.1 . . 3
2 3eqtr2i.2 . . 3
31, 2eqtr4i 2376 . 2
4 3eqtr2i.3 . 2
53, 4eqtri 2373 1
Colors of variables: wff setvar class
Syntax hints:   wceq 1642
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-11 1746  ax-ext 2334
This theorem depends on definitions:  df-bi 177  df-ex 1542  df-cleq 2346
This theorem is referenced by:  indif  3497  dfrab3  3531  iunid  4021  inindif  4075  fnpm  6008
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