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8h
comment Let $A = \left( {\begin{array}{*{20}{c}} 0&1\\ 0&0 \end{array}} \right)$.What is numerical range $A$
sorry, what is $S^1$ in words to let me google it? thanks
8h
answered Let $A = \left( {\begin{array}{*{20}{c}} 0&1\\ 0&0 \end{array}} \right)$.What is numerical range $A$
May
21
asked Involute Frenet frame
May
20
comment reconstruct space curve from $\kappa=\frac{a}{a^2+b^2}$ and $\tau=\frac{b}{a^2+b^2}$
Or, can you give me a link on doc on a web, i tried hardly, but can't find one :(
May
20
comment reconstruct space curve from $\kappa=\frac{a}{a^2+b^2}$ and $\tau=\frac{b}{a^2+b^2}$
Please, can you say some words about a general way of finding curve equation in terms of either $s$ or $t$ if one has curvature and torsion? Thanks.
May
17
revised reconstruct space curve from $\kappa=\frac{a}{a^2+b^2}$ and $\tau=\frac{b}{a^2+b^2}$
edited body
May
17
comment reconstruct space curve from $\kappa=\frac{a}{a^2+b^2}$ and $\tau=\frac{b}{a^2+b^2}$
@user86418 About very first step, yes your order of substeps is better than mine. (i think it is a spiral). Yeh, i forgot about third coordinate.
May
17
revised reconstruct space curve from $\kappa=\frac{a}{a^2+b^2}$ and $\tau=\frac{b}{a^2+b^2}$
edited body
May
17
asked reconstruct space curve from $\kappa=\frac{a}{a^2+b^2}$ and $\tau=\frac{b}{a^2+b^2}$
May
10
awarded  Tumbleweed
May
3
asked Curve torsion through $\mathbf{r}$
Apr
5
accepted Trick with differentials from $\frac{dr}{ds} \to \frac{dr}{dt}$
Apr
5
asked Trick with differentials from $\frac{dr}{ds} \to \frac{dr}{dt}$
Feb
23
awarded  Popular Question
Feb
3
revised Partial derivatives tricks in derivation of Lagrange equation of motion
edited body
Jan
31
accepted Partial derivatives tricks in derivation of Lagrange equation of motion
Jan
31
answered Partial derivatives tricks in derivation of Lagrange equation of motion
Jan
22
accepted Detect if two ellipses intersect
Jan
22
comment Detect if two ellipses intersect
Thanks, i made it work for ellipses with parallel axes.
Jan
22
comment Detect if two ellipses intersect
@YvesDaoust outlines would be enough for me