Recent content by corona7w

I'm trying to buy insurance and they have imposed on me a six-months preexisting conditions exclusion waiting period. I know that means I won't get coverage for conditions that have existed before my new insurance starts, for the next six months. Do those preexisting conditions include...

I'm trying to find the relative max and min for a function. I take the Hessian f_xx * f_yy - f_xx^2 of all the critical points and examine the positive ones, and then look at the f_xx for each critical points to decide if it's a max or a min. But what if the f_xx is 0? How else can I decide what...