Own goal point". As a legitimate defensive play, an Australian rules football defender may concede an "own score". Such a score, referred to as a "rushed behind" and statistically credited to no player (score sheets simply include the tally of rushed behinds), results in the opposition team scoring one point. A defending player may choose to concede a rushed behind when the risk of the opposition scoring a goal (worth six points) is high. It is impossible for a team to concede an own goal worth six points. Own goal An own goal is an event in competitive goal-scoring sports (such as
Five points determine a conic theorem. Similarly, while nine points determine a cubic, if the nine points lie on more than one cubic—i.e., they are the intersection of two cubics—then they are not in general position, and indeed satisfy an addition constraint, as stated in the Cayley–Bacharach theorem. Four points do not determine a conic, but rather a pencil, the 1-dimensional linear system of conics which all pass through the four points (formally, have the four points as base locus). Similarly, three points determine a 2-dimensional linear system (net), two points determine a 3-dimensional linear system (web), one point determines a 4-dimensional linear system, and