Re: Bivalent or Monovalent

John Serembus (
Mon, 5 Feb 1996 20:01:01 +0100

Your post gives an unusual intepretation to the term 'bivalence'. In the context
of logic it has a precise meaning. The term is used to describe FUNCTIONS,
specifically, how many values are in the range of a function. Traditional logic, for
example, is termed bivalent because the truth functions of that logic assign one of
the two truth values 1(true), 0(false). Fuzzy logic is termed multivalent because
the functions range over the interval [0, 1]. What seems to be suggested by your
post is not a function at all, if you are contending that one thing can have
different values at the same time, but rather some more general relation.
There are some logica which are bivalent but are not traditional. For example, you
can have a logic that has a function that assigns either 1/4 or 3/4 to its
propositions. (I don't know how useful that logic would be, but it is possible) You
can have a logic that is multivalent but is not fuzzy. For example, those that take
traditional probability theory as their semantics.