Essentially the same definition he

"By a theory I shall mean the deductive closure of a set of theoretical postulates together with an appropriate set of auxiliary hypotheses; that is, everything that can be deduced from this set." W. H. Newton-Smith, THE RATIONALITY OF SCIENCE, p. 199 http://cdn.preterhuman.net/texts/tho...%20science.pdf

If the author is unable to show the "set of theoretical postulates" ("small number of fundamental assumptions, the so-called axioms") so that critics could check (for validity) the deductive chains leading from postulates to conclusions, his/her theory is not even wrong.

Pentcho Valev