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
The Word for World Is Forest by the Vietnam War, but was living in London when she wrote the novel, cut off from the anti-war movement she had been a part of in Oregon. Written in these circumstances, "The Word for World is Forest" became what Le Guin called a "preachment". She stated that writing the book was like "taking dictation from a boss with ulcers". She said that she had wanted to write about forests and dreaming, but that the "boss" had made her write instead about ecological destruction. Charlotte Spivack stated that the book was an "angry work", that ended on a note of