Beware of the "Black Swan" fallacy. Deductive logic is tautological; there is
no way to get a new truth out of it, and it manipulates false statements as
readily as true ones. If you fail to remember this, it can trip you - with
perfect logic. The designers of the earliest computers called this the "Gigo
Law", i.e. "garbage in, garbage out". Inductive logic is MUCH more difficult -
but can produce new truths.
-- Lazarus Long
