Secant line a circle in the Euclidean plane, a line joining two of them would be a 2-secant (or "bisecant") and a line passing through only one of them would be a 1-secant (or "unisecant"). A unisecant in this example need not be a tangent line to the circle. This terminology is often used in incidence geometry and discrete geometry. For instance, the Sylvester–Gallai theorem of incidence geometry states that if points of Euclidean geometry are not collinear then there must exist a 2-secant of them. And the original orchard-planting problem of discrete geometry asks for a bound on the number of
This is Not a Book This is Not a Book This is Not a Book is a book by Keri Smith that was published in 2009. It is not a normal book, because the book does not exist without the reader. The book is almost completely blank, so the reader creates the content and the final product. The book's purpose is to teach a reader to think creatively and take risks. The main question presented is: if it is not a book, then what exactly is it? The answer is left to the reader to determine. "This Is Not A Book" is much like Wreck