Bivalent or Monovalent

Ian Goddard (
Fri, 26 Jan 1996 12:59:38 +0100

Non-fuzzy Aristotelian logic is called Bivalent to indicate that it allows
for only one of two values, A or ~A, black or white, 1 or 0.

However, I think because Aristotelian logic allows for only ONE value at a
time -- if it is A then it is A, i.e., it is 100% A and 0% ~A -- that
Aristotelian logic is actually * monovalent.*

Fuzzy logic is bivalent because it allows for an array of degrees between
TWO values, and teach degree occupies these two values at the same to a
different degree relative to the others, unlike Aristotelian logic which
occupies only one value at a time.

I think Aristotelian logic is monovalent, and fuzzy logic is bivalent with
an array of degrees between the two values. Do you agree ?