関連ワード:  define continuity of a function    define continuity of a function at a point    define continuity of a function of two variables at a point    define continuity of a function of two variables    define continuity of a function with example    define continuity of a function on an interval    define continuity of a function in maths    define continuity of a function class 11    define continuity of a function at the point x p    define continuity of a function class 10