His notion of welfare is pretty abstract.

We will begin by considering the concept of "quota".

In this paper I would like to examine the notion of "dyad style" and its influence on fine arts.

This chapter will focus on the concepts of geometry.

I must point out that we need to clarify the meaning of this over-used concept.

Perception is based, to a very large extent, on conceptual models - which are always inadequate, often incomplete and sometimes profoundly wrong.