Visualization of a numerical method for determining the type of local extrema of functions with two variables on a contour map without using derivatives. 1.1

[b] f(x, y) = x[sup]4[/sup]+y[sup]4[/sup]-8*x[sup]2[/sup]-18*y[sup]2[/sup]-2 [/b][br][b]*Detailed instructions and explanations for this applet can be found in the previous applets [url=https://www.geogebra.org/m/yf62eg4c]1[/url], [url=https://www.geogebra.org/m/v6pwykyh]2[/url] and [url=https://www.geogebra.org/m/djtadvjc]3[/url].[/b]
– Roman Chijner

Information: Visualization of a numerical method for determining the type of local extrema of functions with two variables on a contour map without using derivatives. 1.1