"The sum of two positive quantities is positive; of two negative is negative; of a positive and a negative is their di…"

"In subtraction, the less is to be taken from the greater, positive from positive; negative from negative. When the gr…"

"The product of a negative quantity and a positive is negative; of two negatives, is positive; of two positives, is po…"

"Positive, divided by positive, or negative by negative, is positive. Zero, divided by zero, is zero. Positive, divide…"

"The square of negative or positive is positive; of zero, is zero. The root of a square is such as was that from which…"

"Of the unknowns, their squares, cubes, fourth powers, fifth powers, sixth powers, etc., addition and subtraction are …"

"Multiply half the difference of the tabular differences crossed over and to be crossed over by the residual arc and d…"

"The old calculations dealing with planets based on the system of Brahma have become erroneous in course of past ages …"

"Florian Cajori, the noted historian, summed up the matter in an extraordinarily suggestive manner: The perversity of …"

"Just as an iron ball surrounded by pieces of magnet does not fall though standing (supportless) in the sky, in the sa…"