Oberg, E: Elementary Algebra (Classic Reprint) -

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Résumé :
Excerpt from Elementary Algebra

The simplest use made of letters to represent numbers is in formulas. A formula may be defined as a mathematical rule expressed by Signs and symbols instead of in actual words. The Object is to make it possible to condense into small space the information that otherwise would be imparted by long and cumbersome rules.

The symbols used in formulas, as well as in algebra in general, are mainly the letters in the alphabet, and the signs are the ordinary signs used in arithmetic, in addition to a number of signs used for special purposes in algebraic expressions only.

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