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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

++ interesting...

* [* causal sets]
* [* self-approaching curves]

++ Trig Cheat Sheet
[* link]
[[collapsible show="+ Show Trig Cheat Sheet" hide="- Hide Trig Cheat Sheet"]]
[[iframe frameborder="0" scrolling="no" width="600px" height="510px"]]

[[collapsible show="+ html" hide="- html"]]
[[code type="html"]]
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