sand dollar. n. 1. Any of various thin circular echinoderms of the order Clypeasteroida, especially Echinarachnius parma, of coastal northern Atlantic and Pacific waters, having a covering of short movable spines.
One reason why linear algebra is very useful is that linear transforms of normal variables are normal. If x ~ N(a, A), then Bx+b ~ N(Ba+b, BABT). In a way, when everything is linear and normal, everything is nice and analytically tractable.
23 people found this helpful. The boolean algebra calculation was useful in determining the psychological or strategic likely outcomes of the individual decision making and understanding their impact on profit. I was really bad at boolean algebra and my friend even told me that he was embarrassed by my poor ability to do it.