1. Continuity

2. What is Continuity? Geometrically, this means that there is NO gap, split, or missing pt. (hole) for f(x) at c. A pencil could be moved along the graph of f(x) through (c, f(c)) WITHOUT lifting it off of the graph. The function not only intended to reach a certain height (limit) but it actually did: Limit exists + Fnc. Defined = Continuity Discontinuity occurs when there is a hole in the graph even if the graph doesn’t actually break into 2 different pieces.

3. Formal Definition of Continuity f(c) exists (c is in the domain of f) lim f(x) exists lim f(x) = f(c) * NOTE: When a fnc. increases and decreases w/o bound around a vertical asymptote (x=c), then the fnc. demonstrates infinite discontinuity. A function is continuous at a point if the limit is the same as the value of the function.

4. Examples 1234 1 2 This function has discontinuities at x=1 and x=2. It is continuous at x=0 and x=4, because the one-sided limits match the value of the function

5. Types of Discontinuities: Removable Discontinuities: Essential Discontinuities: JumpInfiniteOscillating (You can fill the hole.)

6. Removing a Discontinuity: has a discontinuity at x=1. Write an extended function that is continuous at x=1.

7. Continuous functions can be added, subtracted, multiplied, divided and multiplied by a constant, and the new function remains continuous. Also, composites of continuous functions are continuous. *NOTE: Graphing calculators can make non-continuous functions appear continuous; the calculator “connects the dots” which covers up the discontinuities.

8. Evaluate Continuity at the given pt.: 1.f(x) = 2x+3 at x = -4 2.f(x) = at x = 2 3.f(x) = at x = 0