Limit and Continuity
- Definition: Limit at a real number c (Both side limit).
Given > 0, there exists whenever then the limit of f ( x ) at x = c is L, and denoted by otherwise f ( x ) has no limit. Roughly speaking, means that whenever x approaches to c from either side of c, the graph point (x, f(x)) approaches to the point (c, L) on the plane. Definition: Continuity for f ( x ) at x = c ( both side continuity ). Given > 0, there exists then f ( x ) is continuous at x = c. ( i.e otherwise f ( x ) is not continuous at x = c. ( i.e f ( x ) is discontinuous at x = c ). Roughly speaking, means that whenever x approaches to c from either side of c, the graph point (x, f(x)) approaches to the point (c, f(c)) on the plane. Remarks: ( 1 ) The existence of the limit for f ( x ) at x = c is not related to the existence of the output of f ( x ) at x = c. ( 2 ) When , f ( x ) is continuous at x = c. ( 3 ) Whenever does not exist or then f ( x ) is not continuous at x = c.
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