Rolle's Theorem and its Consequences 
Rolle's Theorem and its Consequences
by MIT / Herbert Gross
Video Lecture 16 of 38
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Date Added: June 2, 2011

Lecture Description

Statement of Rolle's Theorem; a geometric interpretation; some cautions; the Mean Value Theorem; consequences of the Mean Value Theorem.

Course Index

Course Description

Calculus Revisited is a series of videos and related resources that covers the materials normally found in a freshman-level introductory calculus course. The series was first released in 1970 as a way for people to review the essentials of calculus. It is equally valuable for students who are learning calculus for the first time.

Part I: Sets, Functions, and Limits
In its most common usage, a “set” is any collection of objects and a “function” is simply a rule that that assigns members of one set to members of another set. As an everyday non-mathematical example, consider the situation in which a teacher assigns grades to students. In this case, the teacher is the function that assigns to each member in the set of students a letter in the set whose members are A, B, C, D and F. While the study of sets and functions is important in all computational mathematics courses, it is the study of limits that distinguishes the study of calculus from the study of precalculus. What this means is the topic of Part I of this course.

Part II: Differentiation
In this part of our course, we introduce the concept of instantaneous rates of change. At the pre-calculus level, the study of constant and average rates of change are introduced as early as elementary school when students start working with fractions. However, in many real-life applications (such as the speed at which an automobile travels), rates are not constant and it becomes important to study instantaneous rates of change. Differential calculus is the branch of mathematics that deals with this topic.

Part III: The Circular Functions
In its original form, trigonometry quantified the relationship between the sides and angles of a triangle and was a branch of geometry that was used extensively in the study of surveying and later in astronomy. As time went on, it was discovered that the properties of the trigonometric functions had much broader applications to such cyclic phenomenon as simple harmonic motion and sound waves. It is in this context that the circular functions are introduced as an outgrowth or extension of the trigonometric functions.

Part IV: The Definite Integral
Differential calculus introduces limits to extend the concept of average rates of change to instantaneous rates of change. The subject known as integral calculus introduces limits to extend the technique for finding the area of rectilinear regions (that is, regions that have straight line borders such as triangles and rectangles) to finding areas of non-rectilinear regions (e.g., circles). Differential calculus and integral calculus are related through the definite integral. The definite integral represents the area of a non-rectilinear region and the remarkable thing is that one can use differential calculus to evaluate the definite integral. How this is done is the topic of this part of our course, which culminates with a discussion of what are called the fundamental theorems of calculus.

Part V: Transcendental Functions
The transcendental functions are those that “transcend” the ones we deal with in beginning algebra courses (e.g., polynomials). These functions include exponential functions, trigonometric functions, and the inverse functions of both. Many real-life phenomena are expressed in terms of transcendental functions. For example, when an investment is accruing compound interest, the value of the investment increases exponentially. Thus it is very important to become “fluent” in the arithmetic of exponential functions if we want to know how fast the interest is accruing at a particular instant.

Part VI: More Integration Techniques
There is a saying to the effect that it’s much easier to scramble an egg than to unscramble one. The process of finding the derivative of a function (that is, its instantaneous rate of change) is always the same. However, the same cannot be said for finding the integral of a function (that is, “unscrambling” its derivative in order to determine what the function is). In this part of our course, we introduce some special techniques for doing this.

Part VII: Infinite Series
Sometimes we must work with sums that have an infinite number of terms; such a sum is referred to as an infinite series. This might happen, for example, when we are computing the exact area of a non-rectilinear region (e.g, a circle). As far back as in the times of ancient Greece, mathematicians were finding the area of circles by inscribing and circumscribing polygons. They found that, if a square was inscribed in a circle and another square circumscribed about the circle, the area of the circle had to be between the areas of the two squares. As the number of sides of the inscribed and circumscribed polygons were increased, the approximations for the area of the circle became more and more exact. However, no matter how many sides the polygons had, the approximation would never be exact. The process for obtaining the exact area from the approximations is what gave rise to the study of sums that had an infinite number of terms. These types of sums require tools from mathematical analysis in order for us to understand and work with them.

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