tags: math

Action executed in 0.000

Each Tag


Common tags - number of posts

art (3), politics (2), geo (2), mapper (2), blog (2), OSM (2), STEM (1), tau (1), gerrymandering (1), MathML (1), web (1), digital (1), activism (1), model (1), Catalan Numbers (1), interior decoration (1), font (1), technology (1), paper (1), Dave (1), puzzle (1), fermentation (1), education (1), Catalan Number (1), sequence (1), Derive (1), fosm (1), co2 (1), Debian (1), klein bottle (1), sphere (1), DC (1), brewing (1), radio (1), bubble (1), double struck (1), Turing (1), beer (1), zometool (1), house (1), scan (1), markup (1), network (1), science (1), Galois (1), pi (1), tile (1), engineering (1), geometry (1), Linux (1),

2 way join

art, math, blog, math, geo, math, mapper, math, OSM, math, math, politics

3 way join

blog, geo, math, blog, mapper, math, OSM, blog, math, blog, math, politics, geo, mapper, math, OSM, geo, math, geo, math, politics, OSM, mapper, math, mapper, math, politics, OSM, math, politics

4 way join

blog, geo, mapper, math, OSM, blog, geo, math, blog, geo, math, politics, OSM, blog, mapper, math, blog, mapper, math, politics, OSM, blog, math, politics, OSM, geo, mapper, math, geo, mapper, math, politics, OSM, geo, math, politics, OSM, mapper, math, politics

5 way join

OSM, blog, geo, mapper, math, blog, geo, mapper, math, politics, OSM, blog, geo, math, politics, OSM, blog, mapper, math, politics, OSM, geo, mapper, math, politics

6 way join

OSM, blog, geo, mapper, math, politics


Meet the Math Professor Who’s Fighting Gerrymandering With Geometry - The Chronicle of Higher Education

Moon Duchin

Moon Duchin is an associate professor of math and director of the Science, Technology and Society program at Tufts. She realized last year that some of her research about metric geometry could be applied to gerrymandering — the practice of manipulating the shape of electoral districts to benefit a specific party, which is widely seen as a major contributor to government dysfunction.

url: http://www.chronicle.com/article/Meet-the-Math-Professor/239260/

type: article, format: blog


Tau Day | No, really, pi is wrong: The Tau Manifesto by Michael Hartl

tags: tau, pi, math
T-shirt with tau on it

Tau Day is an annual celebration of the circle constant τ = 6.283185…, which takes place every June 28 (6/28 in the American calendar system). To learn more about what τ is and why it is important, read The Tau Manifesto, or watch one of the tau videos below.

url: https://www.tauday.com/

type: project, format: page


Home | DC STEM Network

DC STEM Network Logo

The DC STEM Network is a collaboration between the DC Office of the State Superintendent of Education (OSSE) and the Carnegie Academy for Science Education (CASE), launched in 2014. The DC STEM Network unites community partners to help inspire and prepare all DC youth to succeed, lead and innovate in STEM fields and beyond.

The DC STEM Network unites community partners to help inspire and prepare all DC youth to succeed, lead and innovate in STEM...

url: http://www.dcstemnetwork.org/

type: unknown, format: page


Browse the Turing Digital Archive - On Computable Numbers

tags: scan, math, paper, Turing
scan of paper

Extract, 'On computable numbers, with an application to the Entscheidungsproblem' from Proceedings of the London Mathematical Society, (Ser. 2, Vol. 42, 1937); and extract 'On Computable Numbers, with an Application to the Entscheidungsproblem. A correction.' From Proceedings of the London Mathematical Society, (Ser. 2, Vol. 43, 1937).

url: http://www.turingarchive.org/browse.php/B/12

type: project, format: none

Double-Struck Header Title

double struck b

I was amazed to see that the default font in Chrome doesn't have glyphs for the double struck characters in Unicode used for special sets of numbers in math. The header title on this blog was using them, so it was important to me that it was right. My solution is odd, but works very well.

Instead of searching for some widely available font that did have these glyphs rendered, i created my own font. I knew that the DejaVu Sans font on my laptop had them.

I could have just shared this font as a web font and be done with it. But there was still one issue bothering me. I highly doubt that machines recognize the double struck B as a B. So i created a new font with just the letters and digits and used the double struck glyphs from DejeVu Sans. Now you can copy my header title into some a document and get Brian DeRocher.

Counting Bubbles and the Poisson Distribution

brewing bubble count poisson graph

I've been counting the number of bubbles seen per minute in the 2 beers i'm currently brewing. After putting them on a chart, it seemed to me they look like a poisson distribution. I'll let you decide for yourself.


Andrew Harvey's Blog

avatar Andrew Harvey's Blog

url: http://tianjara.net/blog/

type: person, format: blog


Andrew Harvey's Blog | Software Developer, Mapper, Free Culture/Software Supporter, Recreational Cyclist


This blog is now unmaintained since I’ve moved my online precense to http://tianjara.net.

You can also contact me via email, andrewharvey4@gmail.com

I release my code at github, http://github.com/andrewharvey

The content on this blog by Andrew Harvey, unless otherwise noted is licensed under a Creative Commons Attribution-Share Alike 3.0 Australia License.

url: https://andrewharvey4.wordpress.com/

type: person, format: blog


Versatile Wall Tiles Collection by Yigit Ozer » Yanko Design

Versatile logo

Like an M.C. Escher drawing that has no end, neither will your design ideas with the Versatile Wall Tiles Collection by designer Yigit Ozer. This design concept is essentially a wide V shaped tile that has just the right proportions to allows for a multitude of pattern ideas to be arranged. Making this a simple and unique way to highlight any flat surface. Now can someone point me to the door?

url: http://www.yankodesign.com/2010/04/23/geometry-101/

type: article, format: blog


Acme Klein Bottle

Need a zero-volume bottle? Searching for a one-sided surface? Want the ultimate in non-orientability? Get an ACME KLEIN BOTTLE!

url: http://www.kleinbottle.com/

type: company, format: none


Art And Math Conference Zometool Polytope Model

tags: zometool, math, art, sphere
At the 2005 Art and Math Conference, in Boulder, Colorado, many of the participants worked together to assemble a big beautiful Zometool model. This construction is 2 meters in diameter and made from 11540 small plastic parts.

url: http://www.georgehart.com/zome-boulder-2005/zome-boulder.html

type: none, format: page

A Nice Model

OMG i'm clearing out some old files and i came across an equation i jotted down. Based on other writings on this note, i'm guessing it's about 10 years old. I know immediately what it's is modelling. But you'll have to find the function and software to draw it. In 1994 i was using software called Derive.

Here it is in MathML using content markup (ie. not presentation markup).

Unfortunately i just read here that neither Firefox nor Amaya support content markup.

What's the difference between the markups? One makes it easy for non-mathematicians to present mathematical expressions. The other, content, is intended to capture the sematics of math.

What About Digital Radio

I was just thinking the other day. We are moving from an analog world to a digital one. Here are some examples: type writing to word processing, cellphones, television, LPs to CDs, circuit switched to packet switched networks, voice to VOIP. So why is it that AM/FM radio is still analog?

With error correcting algorithms i think the reception of radio would be much clearer. (Error detection is not good enough, since the radio will never ask the broadcaster for a retransmit.)

Error detection and correction is based on the work of Galois [1], who invented finite fields and branch of abstract algebra. Here's a good worksheet.

  1. Did you know that Galois died at the age of 20 in a duel?

Catalan Numbers

C_1 = 1, C_2 = 2, C_3 = 5, C_4 = 14, C_5 = 42, C_6 = 132, ... Catalan Number
parent post: Catalan Numbers
notify me: yes

Math Puzzle

tags: Dave, math, puzzle
This was inspired by Dave asking me this question. Given 1 5 6 7, how do you use them each once, and the operations + - * / to get the number 21?
parent post: Catalan Numbers
notify me: yes


tags: math, sequence
One more try; it is a exponential sequence, but getting smaller not larger.
parent post: Right Side
notify me: yes