Quotable Mathematics

"We do not perceive any quantity such as that its square is negative!" (Bhāskara II, "Bijaganita", 12th century) ...

"When sunya [zero] is added to a number or subtracted from a number, the number remains unchanged; and a number multiplied by sunya bec...

“A quantity divided by zero becomes a fraction the denominator of which is zero. This fraction is termed an infinite quantity. In this quant...

"[H]ere negation is […] contrariety […] that is to say, in the contrary direction. As the west is contrary of east; and the south the c...

“The product of a negative and a positive is negative, of two negatives positive, and of positives positive; the product of zero and a nega...