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Math

the everything formula, numberphile [link]


fibonacci numbers at work [link]

an intuitive guide to linear algebra [link]

eigenvalues and eigenvectors explained visually [link]

how to conquer tensorphobia [link]

matrix cookbook (link)

mathematical symbols (link)

printable protractor (link)

a nice reference site (link)

++ Triangles
let a, b, c be the lengths of the sides of a triangle.
let s = (a + b + c) / 2
area = sqrt(s(s-a)(s-b)(s-c))
height_c = (2 / c) area

++ Hyperbolic Planar Tesselations
http://www.plunk.org/~hatch/HyperbolicTesselations/

++ interesting...

* [*http://www.einstein-online.info/en/spotlights/causal_sets/index.html causal sets]
* [*http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.15.3762 self-approaching curves]

++ Trig Cheat Sheet
[*http://www.scribd.com/doc/200307/Trig-Cheat-Sheet link]
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