ILE Home Intuitionistic Logic Explorer < Previous   Next >
Nearby theorems
Mirrors  >  Home  >  ILE Home  >  Th. List  >  pm1.5 Unicode version

Theorem pm1.5 681
Description: Axiom *1.5 (Assoc) of [WhiteheadRussell] p. 96. (Contributed by NM, 3-Jan-2005.)
Assertion
Ref Expression
pm1.5

Proof of Theorem pm1.5
StepHypRef Expression
1 orc 632 . . 3
21olcd 652 . 2
3 olc 631 . . 3
43orim2i 677 . 2
52, 4jaoi 635 1
Colors of variables: wff set class
Syntax hints:   wi 4   wo 628
This theorem was proved from axioms:  ax-1 5  ax-2 6  ax-mp 7  ax-ia1 99  ax-ia2 100  ax-ia3 101  ax-io 629
This theorem depends on definitions:  df-bi 110
This theorem is referenced by:  or12  682
  Copyright terms: Public domain W3C validator