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Card 8 / 10:
critical point of a function of two variables
the point ( x 0 , y 0 ) is called a critical point of f ( x , y ) if one of the two following conditions holds: f x ( x 0 , y 0 ) = f y ( x 0 , y 0 ) = 0 At least one of f x ( x 0 , y 0 ) and f y ( x 0 , y 0 ) do not exist
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