Lubin
Reputation
25,684
99/100 score
 1d revised Image of the set $\{z \in \mathbb{C}:|z|>r\}$ by the complex exponential function added a coupla backslashes to make sine and cosine look right. Apr 30 revised Splitting field of an irreducible polynomial of degree four Yet further explanation. Apr 28 revised Expand the Laurent series I’ve told OP that the book answer is not right. Apr 26 revised Find $\theta \neq \sqrt{3}+\sqrt{5}$ such that $\mathbb{Q}(\theta) = \mathbb{Q}(\sqrt{3},\sqrt{5})$. Need a hint to get started. typo again Apr 26 revised Splitting field of an irreducible polynomial of degree four typo Apr 26 revised Splitting field of an irreducible polynomial of degree four OP asked for an expansion and explanation. Apr 14 revised Please express the first 3 7-adic digits of a root of $x^3-1$ in $\mathbb{Z}_7$ other than 1. deleted 1 character in body Apr 2 revised There is no proper subgroup of $\mathbb Q$ of finite index began an upTeXing Apr 2 revised Solve for $y$ in terms of $x$ at $z=0$ Just made it into TeX Mar 16 revised Basis of $\mathbb Q (3^{1/3}, \xi )$ Extensive addition to answer a question from OP in the comments. Mar 16 revised homomorphism from ZxZ to Q changed my answer to more fully answer OP’s question. Mar 14 revised Is $\mathbb{Q}(\sqrt[5]{7}),i)$ the splitting field for some polynomial in $\mathbb Q[x]$? At OP’s request, i have explained what a normal extension is. Mar 6 revised $5$-adic expansion of $−2$ added 206 characters in body Mar 4 revised Constructing Finite Field Tables spelling errors Feb 27 revised Prove that a $p$-adic integer $x$ is divisible by $p^n$ if and only if $x_n = 0$ “amplification” as requested by OP Feb 25 revised Invertible elements of a quotient ring of $ℝ[x]$. typo Feb 19 revised Find the minimal polynomial of $\sqrt2 + \sqrt3$ over $\mathbb Q$ typo Jan 31 revised Put $A\cos(x) + B\sin(x)$ into form : $A\sin(x+ \theta)$ edited body Jan 29 revised Find roots or splitting field of a polynomial given its Galois group left out asquare root! Jan 18 revised Find the angle between planes given three lines give proper credit to a commenter