In algebra, letters are used when numbers are not known. Algebraic terms, such as \(2s\) or \(8y\), leave the multiplication signs out. So rather than \(2 \times s\), write \(2s\), and rather than \(8 ...
PROF. GREENHILL, on p. 462 (March 19), gives a naïve and most instructive description of the straits to which a “practical man” is put when he wishes to interpret the simplest general formula.
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