[PostScript]
Lattice (T): trait
  assumes PartialOrder
  includes Semilattice
  introduces \top: -> T
  asserts forall x: T
    x <= \top
  implies 
    Lattice (\lub for \glb, \glb for \lub, \top for \bot, \bot for \top,
             <= for >=, >= for <=, < for >, > for <)
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