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saddle
A 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.
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• MATHEMATICS
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