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Philosophers of science have devised strange concepts such as
verisimilitude (proximity to truth) and pessimistic induction (all
theories in the past proved partially false so present and future
theories are partially false as well) which contradict the deductive
method. Consider Einstein's 1905 light postulate:

http://www.fourmilab.ch/etexts/einstein/specrel/www/ "...light is
always propagated in empty space with a definite velocity c which is
independent of the state of motion of the emitting body."

By a theory I shall mean the deductive closure of the postulate, that
is, the set of all its consequences deduced validly and in the absence
of false or absurd auxiliary hypotheses. If the light postulate is
true, then all its consequences are true.

If Einstein's 1905 light postulate is false, then its antithesis, the
equation c'=c+v given by Newton's emission theory of light, is true.
Then the respective theory (the set of all consequences of the
antithesis deduced validly and in the absence of false or absurd
auxiliary hypotheses) is absolutely true in the sense that all its
conclusions are true.

Clearly if "theory" is properly defined the concepts of truth content
and falsity content are irrelevant. Deductive theories are either
absolutely true or absolutely false.

Pentcho Valev
pvalev@yahoo.com