But we must not falsify observation to avoid theoretical difficulties.

But it is no solution to psychology's theoretical difficulties.

I don't think it can subsidize the arts without running into all sorts of practical and theoretical difficulties.

Despite its early successes quantum field theory was plagued by several serious theoretical difficulties.

He did not dismiss the possibility, but carefully went over the large number of theoretical and practical difficulties involved.

Technical and theoretical difficulties have hindered the development of working civilian fusion technology, though research continues to this day around the world.

Nc3, without an early d4 by White, gives Black few theoretical difficulties .

However, several theoretical difficulties with this theory quickly arose, and Nordström dropped it.

Many theoretical difficulties are explained and/or eliminated if the universe has supersymmetry.

Westfall and I will help work out the theoretical difficulties as they arise.