saddle point
plural of halloo
(slang, transitive) To knock out (a person); to render unconscious by a blow.
(geometry) A point in the range of a smooth function, every neighbourhood of which contains points on each side of its tangent plane.
(informal) Of or pertaining to the United States.
位相解析の過程で表面上の鞍点を見つけ、分類が複雑になった。鞍点とは滑らかな関数の像にある点で、その任意の近傍が接平面の両側に点を含むため、局所的な極大でも極小でもない点のことだ。
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