There are three main conceptual problems in interpreting Marx's production prices.

All candidate theories still have major formal and conceptual problems to overcome.

"The conceptual problem is that there are people running this program who don't understand how citizens feel about privacy in cyberspace."

Effective as it is, this transformation poses a conceptual problem.

Some of our senior physicists think it could help break tough conceptual problems.

Moreover, more of an effort needs to be made to address the conceptual problems in the transition to democracy.

But the theater is not without major problems, both practical and conceptual.

Thinking of woman as a series solves these conceptual problems.

Any theory of an open shop trade union must deal with the following conceptual problem.

When the conceptual problems are multiplied, as here, it is impossible.