Elements of analytical geometry and of the differential and integral calculus (1866)
Davies, Charles, 1798-1876 · New York, Barnes & Co. · leaf 301
In the case of concavity, QM < jPJf, and then,d^y is negative; and since dx^ is always positive, thesecond differential coefficient will have the same sign asthe second differential of y. If w^e take the case in which the ordinates are nega-tive, the second differential coefficient will stiU…
Geometry, Analytic · Calculus
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