This paper examines four arguments in support of Frege's theory of incomplete entities, the heart of his semantics and ontology. Two of these arguments are based upon Frege's contributions to the foundations of mathematics. These are shown to be question-begging. Two are based upon Frege's solution to the problem of the relation of language to thought and reality. They are metaphysical in nature and they force Frege to maintain a theory of types. The latter puts his theory of incomplete entities (...) in the paradoxical position of maintaining that it is no theory at all. Moreover, his metaphysics rules out well-known suggestions for avoiding this difficulty. (shrink)

This brief note shows that the following three tenets, All to be found in frege's "on sense and reference", Form an inconsistent triad: (1) two proper names express the same sense iff their identity-Sentence "contains no actual knowledge"; (2) sentences are proper names; (3) if in a sentence we replace one proper name by another having a different sense, "we see that in such a case the thought changes".