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Card 10 / 10:
saddle point
given the function z = f ( x , y ) , the point ( x 0 , y 0 , f ( x 0 , y 0 ) ) is a saddle point if both f x ( x 0 , y 0 ) = 0 and f y ( x 0 , y 0 ) = 0 , but f does not have a local extremum at ( x 0 , y 0 )
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