# The Natural Logarithm

Taught by Houston
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Lesson Summary:

In this lesson, we learn about the natural logarithm function, which is defined as the integral of 1/t dt. We explore its properties, such as its domain, range, and algebraic properties, and we examine its limits as x approaches infinity and as x approaches 0 from the right. We also see how the natural log function can be used in integration, and we learn about the derivative of a composition of the natural log function with another function u of x, which has a very special form. Overall, this lesson provides a comprehensive understanding of the natural logarithm function and its applications.

Lesson Description:

The natural log function defined as the integral of 1/t dt.

Copyright 2005, Department of Mathematics, University of Houston. Created by Selwyn Hollis. Find more information on videos, resources, and lessons at http://online.math.uh.edu/HoustonACT/videocalculus/index.html.

• What is the natural log function?
• What is ln?
• What are the properties of natural log?
• What is the integral of 1/x?
• What is the derivative of ln |x|?
• What is the integral of x^-1?
• What is the integral of du/u?
• What is the derivative of x^-x?
• #### Staff Review

• Currently 4.0/5 Stars.
The natural log function is defined and explained, as well as its limits and properties. ln(xy) = ln x + ln y is proved in this video. A theorem is also given, explained and proven that the limit of ln x / x^r = 0 for any r > 0 as x goes to infinity. This is a very complete and interesting video on the natural logarithm.