Easy Relations Between The Notions
Clearly every basic elementary class is an elementary class, and every elementary class is a pseudo-elementary class. Moreover, as an easy consequence of the compactness theorem, a class of σ-structures is basic elementary if and only if it is elementary and its complement is also elementary.
Read more about this topic: Elementary Class
Famous quotes containing the words easy, relations and/or notions:
“It was easy to see how upsetting it would be if women began to love freely where love came to them. An abyss would open in the principal shopping street of every town.”
—Christina Stead (1902–1983)
“If one could be friendly with women, what a pleasure—the relationship so secret and private compared with relations with men. Why not write about it truthfully?”
—Virginia Woolf (1882–1941)
“The herd of mankind can hardly be said to think; their notions are almost all adoptive; and, in general, I believe it is better that it should be so; as such common prejudices contribute more to order and quiet, than their own separate reasonings would do, uncultivated and unimproved as they are.”
—Philip Dormer Stanhope, 4th Earl Chesterfield (1694–1773)