Nature of the critical points of a function f(x y): local maximum/minimum/saddle and another ● 05

From [url=https://help.geogebra.org/topic/kritische-punkte-bei-semidefiniter-hessematrix]http://math.furman.edu/~dcs/courses/math21/lectures/l-16.pdf [br]s.16.4 Fehler (0,0) -keiner satttel Punkt!!!!!!!!!!!!!!![/url]
[size=85][b] f(x, y) = ℯ^(-x² - y²) x y[br] fx(xy)= (-2 x² + 1) ℯ^(-(x² + y²)) y [br] fy(xy)= (-2 y² + 1) ℯ^(-(x² + y²)) x [br] fxy(xy)= (2x² - 1) (2y² - 1) ℯ^(-(x² + y²)) [br] fyx(xy)= (2x² - 1) (2y² - 1) ℯ^(-(x² + y²)) [br] fyy(xy)= 2y (2y² - 3) ℯ^(-(x² + y²)) x [/b][/size]
– Roman Chijner

Information: Nature of the critical points of a function f(x y): local maximum/minimum/saddle and another ● 05