## Continuity Rule

### A function is continuous at x = c if: (1) f(c) is defined (2) lim f(x) (x goes to c) exists (3) lim f(x) (x goes to c) = f(c)

There are several continuity rules that are used in calculus to determine whether a function is continuous or not at a certain point. One of the most fundamental rules is the continuity rule that states that a function is continuous at a point if and only if the limit of the function as x approaches that point exists and is equal to the value of the function at that point.

More formally, let f(x) be a function defined on an open interval containing a point a. Then, f(x) is continuous at a if and only if:

lim(x->a) f(x) exists, i.e., the limit of f(x) as x approaches a exists

f(a) exists, i.e., the value of f(x) at a is defined

lim(x->a) f(x) = f(a), i.e., the limit of f(x) as x approaches a is equal to the value of f(x) at a.

This continuity rule is a fundamental concept in calculus and is used to determine whether a function is continuous at a certain point, which is important for understanding the behavior of the function near that point. If a function is not continuous at a certain point, it may have a discontinuity, such as a jump or a vertical asymptote, which can indicate a change in behavior or a point where the function is undefined.

There are several other continuity rules that are used in calculus, such as the continuity of composite functions and the continuity of sums, products, and quotients of continuous functions. These rules allow us to determine the continuity of more complex functions by combining the continuity of simpler functions.

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