EGR Table of Integrals       FAQ

EGR is the web version of Gradshteyn & Ryzhik's Table of Integrals, Series, and Products (6^th edition). The home page for the print edition may be found at http://www.az-tec.com/gr/index.htm.

There are many reasons that EGR is superior to the print edition:

1. EGR contains all of the source material that appears in the print edition, and more material.
2. EGR has an easy to use interface to quickly locate integrals.
3. EGR is constantly updated. While the print edition may be updated from the errata available here, EGR is updated monthly to reflect corrections and new material.
4. EGR can locate integrals that are similar to an integral you have already located.
5. Any special functions appearing in an integral are hyperlinked to the reference section.
6. In the future there will be a chat facility allowing a discussion for each integral.

The entry point for EGR is here. Once there, the instructions for use may be found here. Briefly, the content material may be found by:

1. Describing an integral via an easy-to-user interface
2. Entering a specific integral number
3. Entering a specific section number
4. Clicking on a section number or page number from the active table of contents
5. Entering a page number (and seeing the result as an image, a pdf file, or a ps file)

Extensibility is the ability to continue growing new capabilities. EGR is designed to grow by allowing user submitted integrals to be added to the collection of core integrals.

The print edition of Gradshteyn & Ryzhik is constrained, in part, to be a physical size that is easy to handle. Some other integral tables are multiple volumes and are not as easy to use. Sucessive print editions of Gradshteyn & Ryzhik have added new integrals; eachnew integral has been selected for its broad applicabilty. However, many other integrals have been evaluated that would be of use to users.

Each month any new submitted integrals are checked at a simple level (i.e., they are not "confirmed"). If they pass this test then they are added to the core content of EGR. When a user is looking for a specific integal in EGR they can turn on or turn off the ability to search the contributed integrals for matches while searching the rest of the database. If a user search results in contributed integrals, then each matching contributed integral is clearly label to show that it is a submitted integral. The contributed integrals are identified by a unique identifying number, so that users can reference them in their work.

This procedure is not completely described at this time. Please send an email message to egr_contribute@az-tec.com and we will send you preliminary instructions.

First, the parsing of user input of mathematics is very difficult, and secondly the matching of user input to an integral in a table is very difficult. Research into this problem (with a small table of integrals) may be found at a site created by Professor Fateman of UC Berkeley, see http://torte.cs.berkeley.edu:8010/tilu.

This work was performed by Daniel Zwillinger.

Send email to egr_info@az-tec.com