saddle point

noun Mathematics.
a point at which a function of two variables has partial derivatives equal to zero but at which the function has neither a maximum nor a minimum value.

Origin:
1920–25

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Based on the Random House Dictionary, © Random House, Inc. 2014.
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E saddle is the system energy when the diffusing atom is at the saddle point position.
The streamlines along the blade leading edge bifurcate as they approach the saddle point.
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