[align=justify][box_out][box_in] Although the term ‘algebra’ is now in universal use, various other appellations were used by the Italian mathematicians during the Renaissance. Some Italian writers termed it the Regula rei et census, the rule of the thing and the product, or the root and the square. The principle underlying this expression is probably to be found in the fact that it measured the limits of their attainments in algebra, for they were unable to solve equations of a higher degree than the quadratic
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