1 Cubism was invented around 1907 in Paris by Pablo Picasso and Georges Braque. 2  Cubism was the first abstract style of modern art. 3  A Cubist painting ignores the traditions of perspective drawing and shows you many views of a subject at one time. 4  The Cubists introduced collage into painting.
Two linear systems using the same set of variables are equivalent if each of the equations in the second system can be derived algebraically from the equations in the first system, and vice versa.
Equivalence partitioning: A black box test design technique in which test cases are designed to execute representatives from equivalence partitions. In principle test cases are designed to cover each partition at least once. In equivalence partitioning, the underlying model is a graphical or mathematical one that identifies equivalent classes--which are also called equivalent partitions- -of inputs, outputs, internal values, time relationships, calculations, or just about