# Devilathor

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bio website devilmat.blogspot.com location Colombia age 20 member for 7 months seen 6 hours ago profile views 78

Hi guys! just another undergraduated math student, nice to meet you.

# 24 Questions

 5 How to write a particular fixed field as a simple extension of $\mathbb{R}$? (Morandi's book) 4 About $\mathbb Z_{p}[\sqrt{k}]$, when is it a field? [duplicate] 3 Convergence of the series $\sum \sqrt{a_n}/n$ given that $\sum a_n$ converges 3 Conceptual question about second isomorphism theorem for groups 2 How do we prove the continuity of the exponential function restricted to $\mathbb{Q}$?

# 410 Reputation

 +2 NTRU cryptosystem +2 can the empty set be an element of a group? +5 Proving there exists a curve whose tangent vector $v$ satisfies $\nabla f \cdot v = 0$ +10 Let $G$ be a group. If $H\leq G$ is a subgroup and $N\vartriangleleft G$, then $HN$ is a subgroup of $G$.

 3 Let $G$ be a group. If $H\leq G$ is a subgroup and $N\vartriangleleft G$, then $HN$ is a subgroup of $G$. 2 When $ax+by+cz+d=0$ is a plane, $a^2 + b^2 + c^2 \neq 0$ 1 Intro to Real Analysis 1 $\sum_{n=1}^{\infty} (a_n+b_n)=\sum_{n=1}^{\infty} a_n + \sum _{n=1}^{\infty} b_n$? 0 NTRU cryptosystem

# 37 Tags

 3 abstract-algebra × 14 1 real-analysis × 4 3 group-theory × 6 1 sequences-and-series × 3 3 normal-subgroups 1 proof-strategy 2 linear-algebra 0 galois-theory × 5 2 vector-spaces 0 field-theory × 4

# 12 Accounts

 Mathematics 410 rep 14 Cryptography 222 rep 6 Area 51 151 rep 1 Music: Practice & Theory 138 rep 4 Super User 125 rep 4