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Visualization of a numerical method for determining the type of local extrema of functions with two variables on a contour map without using derivatives. 4.1

f₄(x, y) = kf*(3 (1 - x²) ℯ-(x - 0.5)² - (y + 1)² - 2 (x / 5 - x³ - y⁵) ℯ-x² - y² sin(x - y)) *Detailed instructions and explanations for this applet can be found in the previous applets 1, 2 and 3.

Visualization of a numerical method for determining the type of local extrema of functions with two variables on a contour map without using derivatives. Implicit curves of the equations: fx(x,y)=0 and fy(x,y)=0. Contour lines

Visualization of a numerical method for determining the type of local extrema of functions with two variables on a contour map without using derivatives. Implicit curves of the equations: fx(x,y)=0 and fy(x,y)=0. Contour lines