Microwave Arithmetic
on a microwave, you press 2 0 0 for 120 seconds, but 1 2 0 for 80 seconds, yet 9 0 for 90 seconds.
can you establish the rules for microwave number system or microwave arithmetic?
O, math, my true love, but how i have alienated thee, and you being quite difficult.
see also: Teacup Recursion Animation
Xah's Math Blog Archive 2011-11
a project by a old friend at Wolfram Research. 〈The State of the Unit: The Kilogram〉 http://www.kickstarter.com/projects/52746223/the-state-of-the-unit-the-kilogram-documentary-fil?ref=live
read this, and you'll understand everything about complex numbers, without hearing a word of “complex”. Coordinate Transformation
Math Symbols in Unicode. Now, hover your mouse over to see the full symbol name.
a blog by Glenn Wilcox with lots beautiful math-related pictures generated in Rhinoceros 3D @ http://www.generativedesigncomputing.net/
O, math, my true love, but how i have alienated thee, and you being quite difficult.
on a microwave, you press 2 0 0 for 120 seconds, but 1 2 0 for 80 seconds, yet 9 0 for 90 seconds.
can you establish the rules for microwave number system or microwave arithmetic?
thx to weizhoupan
can you identify what function is this?
it looks like a Mobius Transformation. But what's the exact parameters and what's the input image? (assume each ball is just a dot.)
Mobius Transformation is a function of the form f[z] = (a z + b) / (c z + d) and a d − b c ≠ 0. The variables are all complex numbers.
For a simple geometric explanation of complex numbers, see: Isometries: Translation, Rotation, Reflection and Mandelbrot Set Explained (no complex number needed).
recursion bonanza. moved to Teacup Recursion Animation
5-Point Conics (needs Java installed.)
Lojban is a constructed language, design based on predicate logic. Some tutorial here, with voice recording: Xah's lojban Tutorial.
logic; linguistics
“The more there is of mine, the less there is of yours.”
That's the concept of Zero-sum game. However, in real world, most things isn't zero-sum game. Both parties actually benefit. ⁖ when you give something you no longer want to someone, a value is created “out of nothing”.
Mathematician Robert J Vanderbei made a comment at Geometry: Gallery of Surfaces. He wrote a surface viewer using latest tech WebGL. It's excellent. Check it out at 〔 http://www.princeton.edu/~rvdb/WebGL/minsurf.html 〕 . You will need to use a broweser that supports WebGL, such as Google Chrome.
I can never remember what “xor” do. But now i got a easy way to remember it. xor returns true if the values of two sides differ.
See also: Logical Operators, Truth Table, Unicode
update: Math Font, Unicode, Gothic Letters, Double Struck, 𝔄 𝔅 ℭ
updated links: Great software for Tilings, Patterns, Symmetry
Great Software for Plane Geometry
Intro to Public-key Cryptography for Sys Admin; What's HTTPS, SSH, SSL, TLS, AES, SHA-1, MD5, …
this tweet is going around:
Dear math, i'm sick and tired of finding your x, just accept the fact that she is gone.
It needs a prelude:
dear girls, i had a fight with my x, but i think she loves me still. help me find x^2+1=5. —Math
3 wonderful articles on cycloids. By mathematician physicist John C. Baez.
It mentioned my site a lot. Thanks John.
William Thurston died. (1946 〜 2012). Of skin cancer.
I think i first heard of him thru Jeff Week's book 《The Shapes of Space》. 〔☛ Reading Notes on 《The Shapes of Space》〕 I realized that he's one of the world's top mathematician. Though, his work is beyond my understanding.
What Voting Systems are There?
Memories of Kurt Gödel By Rudy Rucker. @ www.rudyrucker.com…
Discovered a Unicode Character ℇ (EULER CONSTANT)
Discovered a Unicode char ℇ
character: ℇ (codepoint 8455, #o20407, #x2107) name: EULER CONSTANT old-name: EULERS
This is a bit strange. It's not clear whether it meant the base of the natural logarithm or Euler–Mascheroni constant.
The symbol for the base of the natural logarithm is traditionally ℯ (SCRIPT SMALL E), while the symbol for Euler–Mascheroni constant is γ (GREEK SMALL LETTER GAMMA).
The Unicode ℇ has name EULER CONSTANT. It's a bit ambiguous, but i suppose it means ℯ. However, i tried several Unicode fonts, all of them has the appearance of mirrored 3, none showed it as ℯ.
Geometric Dissection in Expandable Table Furniture 📺
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