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Draw a cylindrical surface x ^ 2+y ^ 2 = 1, y ^ 2+z ^ 2 = 1, z ^ 2+x ^ 2 = 1 intersects graphics painting theoretical calculation showing the most speed drop diameter (dashed lines said) multivariate function seeking extreme value method simulation the most speed drop line the iterative density distribution of the quadratic function f (x) = 4x (1-x) quadratic function f (x) = ax (1-x) of iterative spider diagram