New High School Algebra (Classic Reprint)

Excerpt from New High School Algebra

Historical note. - The symbol, X, was first used by an English man; Oughtred, about 1631. The symbol, was introduced by Leibnitz in 1693. Multiplication was indicated as early as the thirteenth century, in Hindu and Italian books, by simply writing the factors Side by Side. This method was forgotten for a time, and was reintroduced by German algebraists during the fifteenth century.

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