# dktr.k1

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bio website n/a location Latin America & Europe age 28 member for 1 year, 9 months seen yesterday profile views 23

math student
open source enthusiast

# 10 Questions

 8 The index of $\xi_4^*$ in $\xi_4$ 4 The elements of $\mathbb{Z}[\sqrt{-5}]/(2,\sqrt{-5}+1)$ 3 From a short exact sequence $\mathbb{Z}_k\cong \mathbb{Z}/ \mathbb{Z}$, $k>1$? 2 The closure of a complex Set of Powers. 2 Alternate proof for $2^{2^n}+1$ ends with 7, n>1.

# 162 Reputation

 +2 Studying the function $f(x) = x^4-6x^2$ using derivatives: minima, maxima, inflection, concavity +10 The closure of a complex Set of Powers. +5 How to use $dz=d[r(t)(\cos t + i\sin t)]$ as a change of coordinates? +5 The elements of $\mathbb{Z}[\sqrt{-5}]/(2,\sqrt{-5}+1)$

 1 Index of $n\mathbb{Z}$ in $\mathbb{Z}$. 0 Studying the function $f(x) = x^4-6x^2$ using derivatives: minima, maxima, inflection, concavity 0 The closure of a complex Set of Powers. 0 Cayley tables for two non-isomorphic groups of order 4.

# 18 Tags

 1 abstract-algebra × 5 0 elementary-number-theory 0 complex-analysis × 5 0 exact-sequence 0 general-topology × 2 0 finite-groups 0 group-theory × 2 0 number-theory 0 ring-theory × 2 0 geometric-construction

# 10 Accounts

 Mathematics 162 rep 11 Super User 41 rep 8 Ask Ubuntu 10 rep 9 Android Enthusiasts 10 rep 4 Stack Overflow 6 rep 4