  Let X be a non-empty set and U a ring of subsets of X. The countable additive
functions U->{0,1} are called measures. The paper gives some definitions
(derivable measures, the Lebesgue-Stieltjes measures) and properties of these
functions, its purpose being that of reconstruction of the measure theory
within this frame, by analogy with the real measure theory. We mention the
special case of the Riemann integrals.
