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Difference between revisions of "Truths"

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Latest revision as of 05:32, 3 November 2014


  1. For all a and b, (a,b) is an ordered pair.
  2. For all a, b, c and d, (a,b) = (c,d) if and only if a = c and b = d.
  3. There exists exactly one a such that a is an empty list.
  4. For all a and b, if b is a list, then {a}:b is a non-empty list.
  5. For all a, if a is a non-empty list, then there exist b and c such that a = {b}:c and c is a list.
  6. For all a, b, c, and d, if b and d are lists, then [{a}:b = {c}:d if and only if [a = c and b = d]].
  7. For all a and b, if b is a list, then [the head of {a}:b is a, and the tail of {a}:b is b].
  8. For all a, b and c, if c is a list, then [a is an element of {b}:c if and only if [a = b or a is an element of c]]
  9. For all a, a is not an element of the empty list.
  10. For all a, b and c, if b and c are lists, then ({a}:b) ++ c = {a}:(b ++ c).
  11. For all c, if c is a list, then {} ++ c = c (where {} is the empty list).
  12. For all Atoms X and Y, X * Y is an Atom.
  13. E is an Atom. For all Atoms X, E * X = X and X * E = X.
  14. For all Atoms X, [X’ is an Atom, and X * X’ = E and X’ * X = E].


  1. {A}:::{B}&&{B}:::{C}&&{C}:::{A} = 0 [1]