Logic Literal

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A Logic Literal is a Logic Sentence in a Logic System without Logical Connectives.


  • (Wikipedia, 2009) ⇒ http://en.wikipedia.org/wiki/Literal_(mathematical_logic)
    • In mathematical logic, a literal is an atomic formula (atom) or its negation. Literals can be divided into two types:
      • A positive literal is just an atom.
      • A negative literal is the negation of an atom.
    • A pure literal is a literal such that every occurrence of its variable (within some formula) has the same sign.
  • CYC Glossary http://www.cyc.com/cycdoc/ref/glossary.html
    • literal: Most generally, a literal is a CYC® expression of the form (predicate arg1 [arg2 … argn]), or its negation, where the number of arguments to the predicate can be any positive integer (but usually not more than 5), and the arguments can be any kind of term