Until this is realized, no satisfactory theory of perception, sensation, or imagination is possible.

No completely satisfactory theory has been proposed to account for Earth's history of glaciation.

If the group is neither abelian nor compact, no general satisfactory theory is currently known.

Without a satisfactory theory of quantum gravity, one cannot perform such a computation for black holes.

I don't know that it's a very satisfactory theory.

But it has never been a satisfactory theory.

There is not any satisfactory theory on their origin.

At present, however, we lack an entirely satisfactory theory to explain the existence of the three mechanisms.

But no satisfactory mathematical theory of concept-similarity has been developed yet.

In the second place he convinced me that the positions we had hitherto held left no. room for any satisfactory theory of knowledge.