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Politics : Politics for Pros- moderated

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To: unclewest who wrote (484157)	4/23/2012 8:14:02 PM
From: ManyMoose	1 Recommendation Read Replies (2) of 793954

According to Wikipedia: The magnetic compass was invented during the Chinese Cao Wei Dynasty between the 3nd century CE and 4th century AD, [1] and was used for navigation by the 11th century. [2] The compass was introduced to medieval Europe 150 years later, [2] where the dry compass was invented around 1300. [3] This was supplanted in the early 20th century by the liquid-filled magnetic compass. [4] en.wikipedia.org While the word algebra comes from the Arabic language (????? al-jabr "restoration") and much of its methods from Arabic/Islamic mathematics, its roots can be traced to earlier traditions, which had a direct influence on Muhammad ibn Musa al-Khwarizmi (c. 780–850). He later wrote The Compendious Book on Calculation by Completion and Balancing, which established algebra as a mathematical discipline that is independent of geometry and arithmetic. [4] en.wikipedia.org

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