*This World Wide Web page written by
Dan Styer,
Oberlin College Physics Department;
http://www.oberlin.edu/physics/dstyer/FeynmanHibbs/;
last updated 8 July 2014.*

I can well remember the day thirty years ago when I opened the pages of Feynman-Hibbs, and for the first time saw quantum mechanics as a living piece of nature rather than as a flood of arcane algorithms that, while lovely and mysterious and satisfying, ultimately defy understanding or intuition. It is my hope and my belief that this emended edition will open similar doors for generations to come.

This World Wide Web site is devoted to the emended edition of Quantum Mechanics and Path Integrals, by Richard P. Feynman and Albert R. Hibbs emended by Daniel F. Styer (first edition: McGraw-Hill, New York, 1965 -- emended edition: Dover Publications, Mineola, New York, 2010) (ISBN: paperback 978-0-486-47722-0) (371 plus xii pages) You may send the emender computer mail at Dan.Styer@oberlin.edu. |

The book *Quantum Mechanics and Path Integrals*
was first published in 1965, yet is still exciting, fresh,
immediate, and important.
It combines qualitative insight and technical brilliance
in Feynman's characteristic manner.
Although several more recent books treat this topic,
these books emphasize the *mathematics* of path
integration rather than the *physics* of quantum mechanics.
All of these books lack Feynman's insight and verve.
Indeed, the first sentence of Larry Schulman's book
*Techniques and Applications of Path Integration* is
"The best place to find out about path integrals is
in Feynman's paper."

The first edition of this book suffered from a grave flaw: It was riddled with typographic errors and infelicities. I described the book as "full of extraordinary insight and excruciating errors" and produced a list of 879 errors that extended to 39 pages.

Here are explications of several difficult points:

- Classical action for the harmonic oscillator: Problem 2-2
- Scattering wave function: Problem 6-13
- Diffraction through a sharp-edged slit: Section 3-3
- Kernel for charged particle in magnetic field: Problem 3-10
- Kernel for the forced harmonic oscillator: Problem 3-11
- Scattering wave function: Problem 6-13
- Harmonic oscillator amplitudes: Problem 8-1
- The forced harmonic oscillator: Section 8-9
- Eliminating field variables: Equation (9-63)
- Microscopic expression for heat: Equation (10-19)

Here is a spreadsheet to calculate and plot the sharp-edged slit diffraction results of figure 3-6. To use it you will need Microsoft Excel and the XNUMBERS free open-source add-in package.