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Arturo Magidin earned this badge 151 times |
jun 12 at 6:49
How to select an field of study?
may 30 at 10:37
Eigenvectors of real symmetric matrices are orthogonal
apr 15 at 11:34
Semi-direct v.s. Direct products
mar 29 at 5:25
Classification of prime ideals of $\mathbb{Z}[X]$
mar 18 at 22:36
Explicit computation of a Galois group
feb 2 at 6:18
On the order of elements of $GL(2,q)$?
jan 31 at 23:42
Prove that $x^{2} \equiv -1$ (mod $p$) has no solutions if prime $p \equiv 3\pmod 4$.
jan 30 at 22:21
Zorn's lemma in abstract algebra?
jan 29 at 12:13
dual space is a vector space
nov 24 at 13:44
Pseudo Proofs that are intuitively reasonable
nov 20 at 12:47
What is isogeny?
nov 6 at 17:23
Irreducible but not prime in $\mathbb{Z}[\sqrt{-5}] $
oct 31 at 13:34
Short Exact Sequences & Rank Nullity
oct 18 at 3:37
Finite Groups with a subgroup of every possible index
oct 12 at 21:27
Complex numbers, solutions of $1-z+z^2=0$
aug 21 at 21:24
Nice puzzle: 100 bread rings and two bags
aug 2 at 1:30
Tangent Line to $\sin x+\cos x$
jul 25 at 2:12
Proof using Reductio ad absurdum (RAA)
jul 22 at 9:35
Normal subgroups of $S_4$
jul 19 '12 at 6:20
${n \choose k} \bmod m$ using Chinese remainder theorem?
jul 9 '12 at 17:06
Find an ideal in $K[x,y]$ that is maximal but not principal.
jul 5 '12 at 20:14
Showing that a cyclic automorphism group makes a finite group abelian
jul 5 '12 at 3:24
Constructive proof of the existence of an algebraic closure
jul 1 '12 at 1:01
Explanation for why $1\neq 0$ is explicitly mentioned in Chapter 1 of Spivak's Calculus for properties of numbers.
jun 27 '12 at 1:39
Limit of the form $\infty - \infty$
jun 19 '12 at 18:38
How to solve this quadratic congruence equation
jun 13 '12 at 17:47
Is there a differential limit?
jun 13 '12 at 9:12
Is there a non-cyclic group with every subgroup characteristic?
jun 6 '12 at 21:55
A question about Non-Abelian Tensor Product
jun 5 '12 at 15:16
Common Problems while showing Uniform Convergence of functions
may 31 '12 at 1:45
Geometric multiplicity of an eigenvalue
may 26 '12 at 10:04
What if your research paper got rejected with few comments given on paper?
may 22 '12 at 18:07
Lightbulbs Puzzle
may 3 '12 at 16:34
Upper and Lower Bounds of $\emptyset$
apr 25 '12 at 6:26
Motivation for Tom Lehrer's song “Lobachevsky”?
apr 21 '12 at 14:09
Question about the Dual Statement for Injective Modules
apr 16 '12 at 18:22
Why do we use Φ while calculating the encryption key in RSA method?
mar 24 '12 at 20:23
Evaluate $\lim_{x \to 2} \frac{|x^3 - 8|}{x - 2}$
mar 22 '12 at 12:17
Example of fields that are not subsets of the complex numbers
mar 19 '12 at 13:11
The last digit of $n^5-n$
feb 16 '12 at 15:26
Showing $\gcd(n^3 + 1, n^2 + 2) = 1$, $3$, or $9$
feb 15 '12 at 22:08
Prove that there can't be 985 divisors of $123456…19841985$
feb 13 '12 at 8:07
Proof of no simple group of order 992
feb 8 '12 at 10:59
Is $x^{17}+x+1$ irreducible over $\mathbb{Q}$? Over $\mathbb{Z}$? Over $\mathbb{F}_2$?
feb 7 '12 at 16:06
Can the natural numbers be uncountable?
jan 28 '12 at 21:50
How is “Some computer science majors take discrete math” not an implication?
jan 26 '12 at 8:39
An equivalent definition of a group
jan 23 '12 at 4:11
Why is the area under a curve the integral?
jan 17 '12 at 17:41
Is the matrix $A$ diagonalizable if $A^2=I$
