Multivariable Calculus With Analytic Geometry, ... Now

She invoked the . She looked for the spot where the gradient of the mountain was perfectly parallel to the gradient of the fence (

Sora began at the base. To find the fastest way up, she used her . "The gradient vector Multivariable Calculus with Analytic Geometry, ...

to see the slope moving North.By combining these, she maintained her trajectory, even when the ground felt like it was twisting beneath her. The Treacherous Saddle Point She invoked the

Near the summit, Sora reached a strange clearing. To her left and right, the ground rose like high walls. In front and behind, the ground dropped off into deep canyons."A ," she whispered. Her compass spun wildly; the slope was zero, but she wasn't at the top. She used the Second Derivative Test . By calculating the discriminant ( "The gradient vector to see the slope moving North