Visualization of a numerical method for determining the type of local extrema of functions with two variables on a contour map without using derivatives. 2.1
f2(x, y) = kf*(-2 x⁵ y - 2y⁶ - 2x² y² + 2y³ + x³ + 3x² + 4y² + x y + x - y - 5)
*Detailed instructions and explanations for this applet can be found in the previous applets 1, 2 and 3. 
