Source: Mathematical Thought from Ancient to Modern Times (1972), pp. 252-253.
“The Hindus introduced negative numbers… The first known use is Brahmagupta about 628; he also states the rules for the four operations with negative numbers. Bhāskara points out that the square root of a positive number is twofold, positive and negative. He brings up the matter of the square root of a negative number but says that there is no square root because a negative number is not a square. No definitions, axioms, or theorems are given.
The Hindus did not unreservedly accept negative numbers. Even Bhāskara, while giving 50 and -5 as two solutions of a problem, says, "The second value is in this case not to be taken, for it is inadequate; people do not approve of negative solutions."”
However, negative numbers gained acceptance slowly.
Source: Mathematical Thought from Ancient to Modern Times (1972), p. 185.
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Morris Kline 42
American mathematician 1908–1992Related quotes
Source: Mathematics and the Physical World (1959), p. 51.
Source: Mathematical Thought from Ancient to Modern Times (1972), p. 252.
Source: Mathematical Thought from Ancient to Modern Times (1972), p. 592.
Source: Mathematical Thought from Ancient to Modern Times (1972), p. 192.
Source: Mathematics and the Physical World (1959), pp. 49-50.

“In strong families, positive strokes out-number negative broadsides by a wide margin.”
10 Keys to a Strong Family (2002)
Context: In strong families, positive strokes out-number negative broadsides by a wide margin. Members regularly express appreciation: "Thanks for fixing the drainpipe." "You look so nice in that dress." "The dinner was great." Criticism is offered gently. After all, strong families figure, if we can be kind to strangers, why not to one another?
Source: Mathematical Thought from Ancient to Modern Times (1972), p. 253.
Source: Mathematical Thought from Ancient to Modern Times (1972), p. 143.