中译者序言 　 　　　查理大帝（公元768—814年在位）一称查理曼，是欧洲中世纪历史上的有名人物，是法兰克国家加洛林王朝-Charlemagne in the preamble translator (reigned 768-814 AD) a man called Charlie, is the history of the Middle Ages in Europe well-known figures, is the national Carolingian Frank

The word bibliographia (βιβλιογραφί α) was used by Greek writers in the first three centuries AD to mean the copying of books by hand. In the 12th century, the word started being used for "the intellectual activity of composing books". The 17th c

In linear algebra, Gaussian elimination (also known as row reduction) is an algorithm for solving systems of linear equations. It is usually understood as a sequence of operations performed on the associated matrix of coefficients. This method can al