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Rabi Kumar Chakraborty
  • Member for 4 years, 3 months
  • Last seen this week
  • Halisahar, Kanchrapara, West Bengal, India
276 votes
4 answers
73k views

Norms Induced by Inner Products and the Parallelogram Law

210 votes
10 answers
69k views

Teaching myself differential topology and differential geometry

134 votes
4 answers
18k views

Is it possible for a function to be in $L^p$ for only one $p$?

  • 7,953
82 votes
3 answers
17k views

Why is the Möbius strip not orientable?

  • 3,695
76 votes
5 answers
28k views

(Theoretical) Multivariable Calculus Textbooks [duplicate]

61 votes
7 answers
23k views

Do matrices $ AB $ and $ BA $ have the same minimal and characteristic polynomials?

  • 2,096
49 votes
3 answers
18k views

On the equality case of the Hölder and Minkowski inequalities

  • 9,783
31 votes
3 answers
13k views

Ring of polynomials over a field has infinitely many primes

  • 2,033
27 votes
2 answers
6k views

Semi-Norms and the Definition of the Weak Topology

  • 331
27 votes
6 answers
8k views

When is the product of two quotient maps a quotient map?

  • 4,480
23 votes
5 answers
5k views

Simply connected manifolds are orientable

  • 3,613
20 votes
3 answers
12k views

Prove that this integral operator is compact

  • 2,627
20 votes
2 answers
2k views

Why isn't every linear subspace of an infinite-dimensional normed space closed?

20 votes
3 answers
4k views

How to construct a genus 2 surface from 8-gon?

  • 4,312
19 votes
2 answers
2k views

Intuition for Smooth Manifolds

18 votes
1 answer
7k views

Local diffeomorphism is diffeomorphism onto image provided one-to-one.

  • 2,282
17 votes
1 answer
3k views

Easier proof about suspension of a manifold

  • 640
16 votes
1 answer
4k views

On every infinite-dimensional Banach space there exists a discontinuous linear functional.

  • 4,610
16 votes
2 answers
12k views

Inclusion of $l^p$ space for sequences

  • 1,555
15 votes
2 answers
3k views

Manifold has uncountable many smooth stuctures if it has one

  • 1,466
15 votes
2 answers
17k views

Limit Supremum and Infimum. Struggling the concept

  • 12k
14 votes
3 answers
2k views

Why $\mathbb{RP}^2$ can not be embedded to $\mathbb{R}^3$?

14 votes
1 answer
2k views

Smash product of compact spaces

  • 460
14 votes
4 answers
5k views

Boundedness and pointwise convergence imply weak convergence in $\ell^p$

  • 5,773
14 votes
2 answers
533 views

On a ring $R$ such that every subring of $R$ is an ideal .

14 votes
3 answers
5k views

vector space of all smooth functions has infinite dimension

13 votes
2 answers
5k views

Why $x^{p^n}-x+1$ is irreducible in ${\mathbb{F}_p}$ only when $n=1$ or $n=p=2$

  • 131
13 votes
3 answers
3k views

Orientation of hypersurface

  • 982
13 votes
1 answer
1k views

Is $\exp:\overline{\mathbb{M}}_n\to\mathbb{M}_n$ injective?

  • 2,677
12 votes
1 answer
1k views

When Two Connections Determine the Same Geodesics