User:Boris Tsirelson/Sandbox1: Difference between revisions
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imported>Boris Tsirelson No edit summary |
imported>Boris Tsirelson No edit summary |
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[http://en.wikipedia.org/wiki/Axiomatization axiomatization] | [http://en.wikipedia.org/wiki/Axiomatization axiomatization] | ||
[http://www.dpmms.cam.ac.uk/~wtg10/definition.html definition] | |||
[[chess]] | [[chess]] | ||
Revision as of 14:55, 28 March 2010
Plane via distances:
Plane via right angles (orthogonality):
Plane via straight lines:
Plane via cartesian coordinates: