convex function

(redirected from Concave upwards)

convex function

[′kän‚veks ′fəŋk·shən]
(mathematics)
A function ƒ(x) is considered to be convex over the interval a,b if for any three points x1, x2, x3 such that a <>x1<>x2<>x3<>b, ƒ (x2)≤ L (x2), where L (x) is the equation of the straight line passing through the points [x1, ƒ(x1)] and [x3, ƒ(x3)].
References in periodicals archive ?
The next most common BV slope was concave upwards decrease at 9.
s (2002), who found linear decrease to be the most common in patients who were normotensive, and concave upwards decrease to be the most common BV slope in hypotensive patients.
BV slopes can be flat, linear decrease, concave upward increase, or concave downward decrease (Andrulli, Colzani, Mascia, Lucchi, Stipi, Bigi, et al.