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Stefan Octavian

Apparently, this user prefers to keep an air of mystery about them.

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  • Member for 2 years, 10 months
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6 What is $\lim_{n\to\infty} \root{2n+1} \of {-1} ?$ Sep 26 '19
4 Can a function have a best quadratic approximation around a point but not a second derivative there? Jan 3
4 Does any sequence with values in a directed set have a monotone subsequence? Jan 22
4 Proof of multivariable chain rule Dec 27 '18
3 Solve this inequality with nested radicals (possibly by induction) Sep 27 '18
2 Completion for this proof that $\sum_{k=0}^n {n \choose k} \cos\left((k+1)x\right) = 2^n \cos^n\frac x 2 \cos\frac{(n+2)x}{2}$ Apr 28 '19
2 Why does $df(x,y,z)=\frac{\partial f}{\partial x}dx+\frac{\partial f}{\partial y}dy+\frac{\partial f}{\partial z}dz$ Mar 23 '19
2 Are functions in maths “pure”? Jan 6
2 Thoughts about the use of $\epsilon$-$\delta$ language in proofs involving limits Jan 13
2 Evaluating limit without L'Hospital's Feb 13
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