Free Textbook: Ordinary and Partial Differential Equations

Finite Difference and Spectral Methods for Ordinary and Partial Differential Equations is a textbook which was written during 1985-1994 and used in graduate courses at MIT and Cornell on the numerical solution of partial differential equations.

A Crash Course in Einstein’s Relativity

Mark Twain once wrote: “It ain’t what you don’t know that gets you into trouble –it’s what you know for sure that just ain’t so.” So it was that, 109 years ago, some of humanity’s collective confusions were lifted when a 26-year-old Swiss patent clerk realized that something that everyone on Earth knew for sure was actually profoundly wrong. Come hear Professor Shankar get to the heart of Albert Einstein’s great insight, which has been called “The most beautiful thought that anyone has ever had,” using a blackboard, a piece of chalk and no equations. The only prerequisite for you: an open mind.

Belt of Stability

The graph of stable elements is commonly referred to as the Band (or Belt) of Stability. At the higher end of the band of stability lies alpha decay, below is positron emission or electron capture, above is beta emissions and elements beyond the atomic number of 83 are unstable radioactive elements.   Alpha decay is […]