## saddleA type of surface that is neither a peak nor a valley but still has a zero gradient. Saddle points are situated such that moving in one direction takes one uphill, while moving in another direction would be downhill. A saddle function
is a function f (x, y)
of two vectors x and y
(which typically lie in different vector
spaces) that is concave up in x
and concave down in y. ## Related category• SOLIDS AND SURFACES | |||||

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