Math Politics: Simon Plouffe and nth Digit Formula of π
What's Function, What's Operator? (exposition)
Logical Operators, Truth Table, Unicode (thoughts; tutorial)
Added more symbols to Emacs Math Symbols Input Mode (xmsi-mode).
∅ ƒ Ø ⌘ ⌥ ‸ ⇞ ⇟ ↖ ↘ ⌫ ⌦ ⎋ ⏏ ↶ ↷ ⇧ ⌤ ⇄ ⇤ ⇥ ↹ ↵ ↩ ⏎ ⌧ ⌨ ␣ ⌶ ⎗ ⎘ ⎙ ⌚ ⌛ ✂ ✄ ✉ ✍ □ ○ ◇ ■ ● ◆.
The symbol “ƒ” has unicode name “LATIN SMALL LETTER F WITH HOOK”, and its old unicode name is “LATIN SMALL LETTER SCRIPT F”.
It's a popular symbol on the mac in the 1990s. Often, a folder's name will end with it. You can type it on the Mac by pressing 【⌥ Opt+f】 See: Mac OS Roman. In math, that symbol is sometimes used to stand for “function”.
Many other symbols above are computer key symbols. They are used by Apple. (See: A Short Survey of Keyboard Shortcut Notations)
◀ ▶ ▲ ▼ ◁ ▷ △ ▽ ☉ ☼ ☾ ☽ ☿ ♁ ♄ ♅ ♆ ♇ ♃ ♂ ♀ ☄
The symbols includes the 9 planets. Note that in Unicode the ♂ (unicode name MALE SIGN) and ♀ (FEMALE SIGN) is the same symbol for Mars and Venus. Unicode does not have separate char for them.
Also some interesting readings. See: Astronomical symbol.
Also, discovered this article about the pseudo-science book Worlds in Collision, which was a best-seller in 1950s. But today's people probably all forgot about it. By analogy, you should know that many concepts, ideas, practices, we have today in math, sciences, in programing, are probably garbage. In particular, i could personal say this is so with regards to math notations, computer syntaxes, and many computing practices (e.g. Design Patterns, eXtreme Programing, which were hot in early 2000s but today pretty much waned. See: Why Software Suck) See also: Men Are From Mars, Women Are From Venus.
Also added the del operator Nabla symbol ∇. The partial derivative symbol ∂.
If you use Emacs and type a lot math symbols, you may be happy to note that i wrote tool for inputting math symbols. See: Emacs Math Symbols Input Mode (xmsi-mode). For why i created it, see: Designing a Math Symbols Input System.
Math Font, Unicode, Gothic Letters, Double Struck.
Discovered another citation to my Wallpaper groups: The 17 Wallpaper Groups work.
Chapter 1 Symmetry Groups Mathematics in Art and Architecture GEK1518 Helmer Aslaksen Department of Mathematics National University of Singapore aslaksen@math.nus.edu.sg www.math.nus.edu.sg/aslaksen/ Symmetry and Patterns
At Source www.math.nus.edu.sg.
More links:
See also: XahLee.org Site Awards and Recognitions.
How Mathematica does Unicode? (tutorial)
Tools to Display Math on Web (tips)
some links to xahlee.org math:
Plants vs Zombie; Thoughts on Strategy and Game Formulation
Principia Mathematica (random thoughts)
It's my greatest sorrow to have found that my friend Robby Villegas has died last month. Robby Villegas Died.
Math Typesetting, Mathematica, MathML (random thoughts)
See: Mathematica Logos thru its History.
Criticisms on Criticisms on a New Kind of Science
For comment and 2 more vids, see: Conical Surface Juggling.
TRON Light Cycle Optimal Strategy
Added a new section to bottom of: The Problems of Traditional Math Notation.
Mathematician Marijke Van Gans died (1955 〜 2009)
Gravity simulator (requires Adobe Flash). Source www.nowykurier.com
See also: Great Math Programs.
For more info and where to buy, see: Geometric Pattern on Sphere and Torus.
Detexify is a tool that lets you draw a math symbol and it shows you the code for LaTeX. The tool is created by Daniel Kirsch. At http://detexify.kirelabs.org/classify.html.
See also: Math Symbols in Unicode.
If you are a emacs user, you can set your emacs up so that any frequently used symbols can be entered by a single shortcut key, or a abbreviation. See: Emacs and Unicode Tips.
Thanks to Tim Tran for Donation.
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Ian Stewart has a new book out.
Read 1/3 of his Flatterland amazon in ≈2002.
See also: FLATLAND: A Romance of Many Dimensions, and Flatland: A Introduction (by Xah Lee) for many subsequent books and films on Flatland. It is one of my favorite book, say, in top 5, of all books in my life.
Thanks to R Michael Underwood for the tip.
Mathematicians Richard Palais and Hermann Karcher, have released a new version of their math visualization software, the 3DXM. The main change is that it now has button-like interface in place of menus, where each button is a icon of the surface or math subject. This makes it much more attractive, and easier to use. Check it out.
Download at 3DXM.
Note: the new version is for Mac only. For Windows or Linux users, there's always the Java version at the same download location. Though, the Java version has only some 50% of surfaces or other math objects.
A fantastic java applet to draw Voronoi diagram interactively. Very nice.
Voro Glide @ Source www.pi6.fernuni-hagen.de
See also: Great Math Programs.
Math Prizes and Nobel Ignobility. (commentary)
My friend, Richard Palais, co-authored with his son Robert Palais a new book Differential Equations, Mechanics, and Computation. I've been hired to help them update the site. The result is this: ode-math.com. Half of the book is free in PDF files. Also, lots of java applets and animation files are coming.
You can buy the book at Amazon: amazon. However, for some reason, Amazon doesn't have extra copies.
Celtic Knots, Truchet tiles, Combinatorial Patterns.
Discovered that there are quite a lot articles in remembrance of Martin Gardner. See bottom of: Martin Gardner (1914 〜 2010).
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