Mathematics is the discipline that deals with concepts such as quantity, structure, space and change. It evolved, through the use of abstraction and logical reasoning, from counting, calculation, measurement and the study of the shapes and motions of physical objects. Mathematicians explore these and related concepts, aiming to formulate new conjectures and establish their truth by rigorous deduction from appropriately chosen axioms and definitions.
Mathematics is used throughout the world in many fields, including science, engineering, medicine and economics. These fields both inspire and make use of new discoveries in mathematics. New mathematics is also created for its own sake, without any particular application in view, a common practice in the branch known as pure mathematics.
The word "mathematics" is often abbreviated math in the U.S. and Canada and maths in Britain, Ireland and many Commonwealth countries.
More on [ Mathematics ]
Games and Puzzles :: Recreations

CellFighter - Shareware game based around an extension of the game of life.
Meta Description: [ A free downloadable and innovative remake of Conway's Game of Life - a real-time strategy of war with fidgety swarms of tiny fighters ]
IBM Research: Ponder This - Monthly logic and math puzzles set by IBM researchers with solutions.
Meta Description: [ Ponder This ]
Jim Loy's Puzzle Page - Classic and original puzzles.
Kakuro-san - Providing graded Kakuro puzzles every day, plus old puzzles.
Meta Description: [ Kakuro-san, your Kakuro Assistant - Daily puzzles, tools to help you, and suggestions to improve your play ]
Leisure Ideas: Puzzles - Some mathematical puzzles with answers and/or a hint.
Meta Description: [ Interesting, challenging and fun to do puzzles by SLICKDITTY. ]
Mathematical Jigsaw Puzzles - Information on polyominos and square puzzles.
Monty Hall Game - JavaScript example of the Monty Hall Game. This game demonstrates the real (empirical) affect of statistics. [Does not display correctly in all browsers.]
Meta Description: [ The Monty Hall Game is a mathematical riddle that challenges logic. Gamblers might want to learn about this before gambling by using this JavaScript example. ]
Perplexus - A forum and collection of brain teasers, logic problems, math problems, paradoxes, science games, probability, riddles, and geometric shapes. The puzzles are searchable and categorized, most have solutions.
Quick Logic Puzzles - Use the clues provided to deduce the correct sequence of numbers in the hidden code.
Meta Description: [ At www.QuickLogicPuzzles.com you will find puzzles that challenge your powers of deduction -- and sharpen your logical reasoning skills, as well. You can download or print the free Quick Logic Puzzles offered on the web site for personal, non-commercial use. Do you like puzzling logic? Maybe even... ]
TechInterview - Answers to technical interview questions, programming problems, and brain teasers.
Meta Description: [ A website dedicated to technical interview questions. ]
The Monty Hall Problem - A probability theory puzzle with solutions. [English and German.]
The Puzzles of Oscar - Contains puzzles and games with solutions.
The Truth Tree's Math and Logic Board - Collection of math and logic puzzles ranging in levels of difficulty.
Meta Description: [ Math and logic puzzles to solve
and compete with other contestants ]
Two Envelope Paradox - Solution - Claims that the two envelope paradox comes from the incorrect use of probabilities.
Meta Description: [ Solution to the two Envelope Paradox: The Two Envelope Paradox comes from the incorrect use of probabilities. Here a Bayesian analysis is given to show where the failure occurs. ]
WU Forums - Discussion board hosted at Berkeley with talk about a variety of solved and unsolved brain teasers.
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