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
Adventures in a City that does not Exist treacherous commerce adviser from the play "The Snow Queen" (by Evgeny Schwartz) decides to use Slavin's ignorance of books in order to deceive him and with the help of other antagonists to subjugate readers worldwide. The protagonists come to help the boy, and together with friends Slava manages to defeat the adviser and his henchmen. When Slava returns to the real world, the first thing he does is to go to the library. Adventures in a City that does not Exist Adventures in a City that does not Exist () is a 1974 Soviet children's musical film, directorial debut of