# Math Articles

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## We come from the future.

I think this needs clarification, as several people seem to be confused:

## Non-Euclidean Geometry

In three dimensions, there are three classes of constant curvature geometries . All are based on the first four of Euclid's postulates , but each uses its own version of the parallel postulate . The "flat" geometry of everyday intuition is called Euclidean geometry (or parabolic geometry), and the non-Euclidean geometries are called hyperbolic geometry (or Lobachevsky-Bolyai-Gauss geometry) and elliptic geometry (or Riemannian geometry).

## Introduction to Algorithms - Download free content from MIT on iTunes

Description This course teaches techniques for the design and analysis of efficient algorithms, emphasizing methods useful in practice.

## Dave's short course in trigonometry

Specific elements of a matrix are often denoted by a variable with two subscripts .

## Lorenz Butterfly

To do and notice: Click in the window to start a particle in motion around the two strange attractors. Click again very near to where you clicked the first time.
Maze Generator The program generates mazes using three standard algorithms: Depth-first search, Prim's algorithm, and Kruskal's algorithm.

## Maze Generator

This is a list of symbols found within all branches of mathematics to express a formula or to replace a constant .

## List of mathematical symbols

Version for printing

## Philosophy of Mathematics

First published Tue Sep 25, 2007; substantive revision Wed May 2, 2012

## Introduction to Algorithms | MIT Video Course - StumbleUpon

About Massachusetts Institute of Technology The Massachusetts Institute of Technology (MIT), founded in 1861, is located in Cambridge, Massachusetts, and is one of the foremost U.S. institutions in science and technology.

## www.maa.org/devlin/LockhartsLament.pdf

Behavior of lines with a common perpendicular in each of the three types of geometry In mathematics , non-Euclidean geometry is a small set of geometries based on axioms closely related to those specifying Euclidean geometry .

## Non-Euclidean geometry

Relplot constructs high-resolution PostScript or PDF plots of the solutions to equations on two variables. Unlike most other plotters, it can handle general equations and inequations, not just functions, and it can plot multiple equations at once.

## Relplot: equation plotter

A competition to find a replacement for one of the gold-standard computer security algorithms used in almost all secure, online transactions just heated up. The list of possibilities for Secure Hash Algorithm-3 , or SHA-3, has been narrowed down to five finalists. They now face the onslaught of an international community of "cryptanalysts" – who will analyse the algorithms for weaknesses – before just one is due to be selected as the winner in 2012.