Elliptical coordinates are defined in 2D and can be rotated around the x or y axis to yield 3D oblate spherical coordinates or prolate spherical coordinates.

## Archive for October 2009

### Oblate spherical coordinates

29 October 2009### Susskind classical mechanics

27 October 2009Found a lecture from Susskind covering Poisson brackets. (Note: this is lecture 9, and I believe lecture 1 actually follows chronologically, since the boardwork is leftover from lecture 9).

### Gapminder and Hans Rosling

21 October 2009Hans Rosling has several videos aimed at making world health data more readily available at his website Gapminder. First saw him through TED.

### QED homework 3

15 October 2009Here is the third homework for the QED topics class. M. sketched out the second quantization.

### A wolf in sheep’s clothing

12 October 2009Today I learned:

Sugar coated bomb (used by socialists to describe the seductive ideas of capitalism) – 糖衣炮彈

A wolf in sheep’s clothing – 披著羊皮的狼

### Physics GRE done!

10 October 2009Worked through the GRE subject exam today. I’ve been studying for it for a couple months, taking the practice exams. Based on scores from those, and how I felt on it, I think I did fairly well.