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baharampuri
  • Member for 9 years, 7 months
  • Last seen more than a week ago
  • India
5 votes
Accepted

A Zariski open subset of a variety has the same dimension as the variety.

4 votes

Can this be the class-equation of a finite group $G$ of order 10?

3 votes

Examples of non-abstract rings?

3 votes

Prove that $\sin 2\alpha=2 \sin \alpha \cos\alpha$

3 votes
Accepted

Hopf algebra of graphs

3 votes

Show that the modified Pell equation $x^2 - 7y^2 = -1$ has no solutions in integers $x,y$.

3 votes

Where can I find the proof that the axiom of choice is equivalent to "every set is a projective object in $\bf Set$"?

3 votes

continuous image of a locally compact space is locally compact

3 votes

Zariski topology irreducible affine curve is same as the cofinite topology

3 votes

For a ring $R$, if $ab=ca$ implies $b=c$, show $R$ is commutative

2 votes

The number of pairs of integers $0\leq a \leq b < 2^N$ such that $ab \geq 2^N$

2 votes

Can both additive and multiplicative operations in a semiring distribute over each other?

2 votes

Matrix decomposition into column vector times its transpose

2 votes

Show that $\phi:A_4\longrightarrow GL_3(\mathbb{C})$ is a irreducible representation

2 votes

$f(x^2+yf(x))=xf(x+y)$.Find f

2 votes
Accepted

a simple question

2 votes
Accepted

Is there a systematic way to solve the equation $x+yi=-y+xi=0$ where $x,y$ complex numbers?

2 votes

Abstract algebra: homomorphism and an element of a prime order

2 votes

prime number problem:

2 votes

Inequalities using AM-GM

2 votes

"If $x$ is a non-unit, then $1-ux$ is a unit"

2 votes

If $5x+7y=2011$ show that $285<x+y<403$

2 votes

Example of a non-polynomial function $f: \mathbb{R} \to \mathbb{R}$ such that $f'(x)$ is negative for $x<0$ and positive for $x \ge 0$.

2 votes
Accepted

A proof that every set of natural numbers contains a minimal element

2 votes
Accepted

In $\mathbb{Z}_2[x]$, the ideal $\langle x^2+x+1\rangle$ is maximal

2 votes

Proof that If G = (V , E ) is a graph, then S is an independent set ⇐⇒ V − S is a vertex cover.

1 vote
Accepted

Showing that addition is well defined on the rational numbers.

1 vote

Does the equation $2\cos^2 (x/2) \sin^2 (x/2) = x^2+\frac{1}{x^2}$ have real solution?

1 vote
Accepted

Hilbert polynomial of twisted cubic 'by hand'?

1 vote

Prove that $\tan \left ( \sum_{k=1}^{n} \theta_k \right ) \geq \sum_{k=1}^{n} \tan (\theta_k)$