Significant updates to the site, most recent first:8/6/09 -- Added Blackbodies page. Still missing nearly all its illustrations; don't know when I'll have time to draw them.
6/21/09 -- Added the Book of Iem, along with a bio of Felix Resilleserre, and added a link to it from the Misc page.
2/1/09 -- Added section on curvature of the field of a symmetric lens to Tiny Lenses page.
1/25/09 -- Added some comments on what changed to the oil price model page.
1/21/09 -- Added discussion of half-lenses and ideal scaling lenses to the tiny lenses page.
1/18/09 -- Added the Tiny Lenses page and moved some material over to it from Spherical Lenses, then added the section on off-axis behavior of tiny lenses.
1/15/09 -- Added several pages to the Simple Optics section: added Snell's Law, Ideal Lenses part II, Diopters, and Spherical Lenses pages. Still need to correct some things in the rest of that section -- doing the new pages was educational.
4/25/08 -- Added Oil Price Model page, in the misc section
2/26/08 -- Added Volume of a Sphere page, in the basic math and physics section
2/20/08 -- Added Pi page to the basic math and physics section
2/16/08 -- Added Aha! Proof version 2 to the proof by picture section.
2/15/08 -- Added Stars in Apollo Photographs page to the misc section. (Page has actually been on the site for a few days but had not been previously linked to.)
2/14/08 -- Added Poincaré 1900 translation, in the misc section
1/20/08 -- Added the rust page
11/23/07 -- Added the cardinality page to the numbers section
11/19/07 -- Added the numbers section, which is still rather incomplete. The basics are there, but a number of theorems are missing, there are no explanatory notes on the notation, and the commentary on cardinality hasn' t been written yet.
11/04/07 -- Added the calculus section, which is still very incomplete -- about half of the planned pages are present. Creating the illustrations has proven to be time consuming.
9/26/07 -- Updated simple optics section. Added proof that simple systems of lenses and mirrors can't enhance visual image brightness.
9/23/07 -- Added simple optics section. Still incomplete, but the main proof is taking a while and I wanted to get the rest up in the mean time. Also added solid angles page, which was needed by the optics pages.
9/7/07 -- Added casual interference patterns page
2/7/07 -- Added speed of light page
2/5/07 -- Added speed of sound page
1/17/07 -- Added moving charge page
1/8/07 -- Added magnetism index page along with two-charge dipoles and the derivation of the dipole field. Moved the dipole force page under magnetism.
12/22/06 -- Added permanent magnet motors and force on a dipole pages.
12/1/06 -- Updated Lagrangian page a bit, and added a few more simple examples.
11/24/06 -- Flipped sign of constant K on the orbit shapes page. Had to reset most of the equations, but I found it confusing with a negative K. Negative K had seemed like a good idea for about the first five lines of the derivation.
11/20/06 -- Minor corrections to Lagrangians page, and added a few missing illustrations on the orbit shapes page.
11/18/06 -- Added the orbit shapes page, which still needs some pictures.
11/16/06 -- Reorganized the site, giving it a little more of a tree structure. It was becoming impossible to find anything and hard to see what was present.
11/15/06 -- Added a trivial proof that the hyperbolic angle is the area above the hyperbola. (Even the trivial ones take time, though, 'cause of the illustrations.)
11/13/06 -- Added the Lagrangian mechanics page.
11/10/06 -- Added the conic sections page, which probably shouldn't be on the front page. Oh, well, the whole site could use reorganizing ... someday.
11/7/06 -- Added the hyperbola focus page under proof-by-picture.
11/6/06 -- Added the ellipse focus page under proof-by-picture. I expect to add a handful of additional "elementary" items to the proof-by-picture page in the coming weeks.
11/2/06 -- Added the parabola focus page under proof-by-picture, and reorganized the proof-by-picture page a little.
10/31/06 -- Added the shortest path condition derivations, both visual and symbolic.
10/25/06 -- Added the Pythagoras page. Has it really been a year? Oh dear. Lie derivatives still nowhere near done.
10/6/05 -- Added the "forward" porthole view page. Lie derivatives still stuck in a holding pattern...
9/6/05 -- Added and then corrected the Swing page. The Lie derivatives page is proving awkward -- some of the images are a bit awkward and it takes a lot of background explanation...
8/16/05 -- Added Alexander's horse.
8/15/05 -- Added SETI page, cleaned up equation formating on linear twins page.
8/9/05 -- Added the Horse of a Different Color.
8/8/05 -- Added Lorentz transform derivation page. Also updated my links page -- should do that more often; several of the links had gone bad or moved.
8/5/05 -- Rewrote comments regarding classical explanations of the Sagnac effect. The comments are on their own page.
7/25/05 -- Added a page on the Sagnac effect.
7/4/05 -- Corrections to French version of the CCentipede story, courtesy of Bernard Chaverondier; remaining errors on that page are entirely mine.
6/22/05 -- Translated the CCentipede story into French.
12/3/04 -- Rewrote the 1996 statistical analysis section on the Florida page. It was wrong.
12/2/04 -- Further updates to the Florida page, including a statistical analysis of 1996 data and a reanalysis of the 2000 and 2004 data. Gotta get back to adding physics and math items, one of these days...
11/8/04 -- Added "miscellaneous" page, and added Florida election data analysis under it.
8/23/04 -- Completed addition of covariant derivatives pages for vectors and 1-forms, under the proof-by-picture page. Could still use some work but it's a start.
8/13/04 -- Added a books page
8/11/04 -- Cleaned up the 1-form page a bit (flipped the diagrams, renamed dual vectors to covectors), added some terms to the glossary, and added the nascent "proof-by-picture" page to the table of contents.
8/9/04 -- Added a (very brief!) glossary, after some feedback indicating I left a lot of things undefined
7/15/2004 -- Corrected a minor error on Revolving Astronaut page and added an explanatory comment
7/10/2004 -- Added Superluminal Shells and Rigid Rods pages
5/27/2004 -- Added the Distant Revolving Astronaut
5/25/2004 -- Added porthole view from Earth and some graphs to "accelerating twins" page
5/19/2004 -- Added "accelerating twins" page, sans graphs and part of the porthole view section
5/8/2004 -- Site went "live"
Page created on 11/16/06