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Series: Calculus: The Concept of the Limit

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About this Series

  • Lessons: 8
  • Total Time: 1h 16m
  • Use: Watch Online & Download
  • Access Period: Unlimited
  • Created At: 07/29/2009
  • Last Updated At: 07/20/2010

In this 8-lesson series, Professon Burger will introduce limits, show you how to find the rate of change over an interval, how to find limits graphically, offer the formal definition of a limit, cover basic and more advanced limit laws, talk about one-sided limits, explain the squeeze theorem and its implications, and talk about continuity and discontinuity of functions.

The position function relates time and location. Setting the position function equal to a distance indicates the time an object is at that location. When solving a difficult problem, it is a good idea to approximate the answer first. Approximating can give insight into how to work the problem.

In algebra, you consider how a function is defined at specific points. In calculus, you can consider the value a function approaches around a specific point. The limit is the range value that a function is tending towards as you get closer to a particular domain value. If a function approaches the same value from both directions, then that value is the limit of the function at that point. If the function approaches different values, then the limit is undefined.

The concept of a limit can be expressed exactly by describing it in terms of tiny neighborhoods that are mapped around a point. Since limits are just numbers, a lot of the properties of real numbers also apply to limits. There are rules governing the limit of a sum, the limit of a difference, the limit of a product, and the limit of a quotient. In addition to covering each of these in this lesson, we'll also look at the scalar multiple rule for limits and the power rule for limits. Additionally, you'll learn about rules that govern the limit of a constant, limits of a function x, limit of a function x^n (or raised to any fixed value, n), the limit of polynomial functions (like 2x^2-4x+7), the limit of rational functions (the quotient of two polynomials), and the limit of functions expressed with radicals (e.g. the nth root of x). Additionally, this lesson will explain and demonstrate the power law for limits (for raising expressions to an exponential power) and the root law for limits.

It is sometimes useful to examine limits from strictly the left or right side. Such limits are one-sided limits. A left-handed limit is the value the function approaches only from the left (increasing). A right-handed limit is the value the function approaches only from the right (decreasing). A limit exists only if the left-handed and right-handed limits both exist and are equal.

In calculus, the squeeze theorem (known as the pinching theorem, the sandwich theorem, the sandwich rule and sometimes the squeeze lemma) is a theorem regarding the limit of a function. The squeeze theorem asserts that if f(x) is less than or equal to g(x), which is less than or equal to h(x) near a and if the limit, L, as x approaches a of f(x) is equal to the limit as x approaches a of h(x), then the limit as x approaches a of g(x) is also equal to L.

A function is continuous at a point if it has no breaks or holes at that location. Three conditions must be met for a function to be continuous at a point. A function, f(x) is continuous at point c if f(c ) is defined, the limit as x approaches c of f(x) exists, and the limit of f(x) as x approaches c is equal to f(c ).

Taught by Professor Edward Burger, this series comes from a comprehensive Calculus course. This course and others are available from Thinkwell, Inc. The full course can be found at http://www.thinkwell.com/student/product/calculus. The full course covers limits, derivatives, implicit differentiation, integration or antidifferentiation, L'Hopital's Rule, functions and their inverses, improper integrals, integral calculus, differential calculus, sequences, series, differential equations, parametric equations, polar coordinates, vector calculus and a variety of other AP Calculus, College Calculus and Calculus II topics.

About this Author

Thinkwell
Thinkwell
2174 lessons
Joined:
11/13/2008

Founded in 1997, Thinkwell has succeeded in creating "next-generation" textbooks that help students learn and teachers teach. Capitalizing on the power of new technology, Thinkwell products prepare students more effectively for their coursework than any printed textbook can. Thinkwell has assembled a group of talented industry professionals who have shaped the company into the leading provider of technology-based textbooks. For more information about Thinkwell, please visit www.thinkwell.com or visit Thinkwell's Video Lesson Store at http://thinkwell.mindbites.com/.

Thinkwell lessons feature a star-studded cast of outstanding university professors: Edward Burger (Pre-Algebra through...

Lessons Included

9-21-2007-06_homepage
Continuity and Discontinuity. Please, continue.
02/02/2011
~ JMacy

Was glad to see this explained in a clear efficient manner, but the only thing that was missing was an example problem.

Nopic_orng
The Limit Law, Part II
09/30/2009
~ Ferddy

GREAT!

Jfilip_homepage
Great lesson
08/05/2009
~ jfilip

These lessons are going to save my butt in my Calculus class. All the stuff from high school finally makes sense. I don't know if it is because I'm older or this guy is like some kind of cyborg teacher but either way, I'm learning.

Below are the descriptions for each of the lessons included in the series:

Supplementary Files: