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Dec
12
comment Building line integrals
@Sigur thanks, now it makes sense. Post it as answer so I can accept it.
Jun
28
comment Using minors to determine type of extrema
Yeah, I'd say related.
Jun
21
comment Extrema of a 2d function
Thanks, I forgot the part where $x=0$ satisfies the first equation.
Apr
3
comment compose two functions to make them differentiable
Really good answer, but I like the one of user6312 better, due to its simplicity :-)
Apr
1
comment compose two functions to make them differentiable
f is not differentiable in 0, and g is not differentiable in 0 (and f(0) = 0, so it's actually the same :-)