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Indrayudh Roy
  • Member for 9 years, 3 months
  • Last seen more than 3 years ago
  • Kolkata, India
8 votes
1 answer
305 views

Solving an inequality : $n \geq 3$ , $n^{n} \lt (n!)^{2}$. [duplicate]

6 votes
2 answers
335 views

Intuition behind the concept of points "near infinity" in topology

5 votes
0 answers
204 views

${n \choose r}=\frac {n!}{r!(n-r)!}$ without using the permutation approach.

5 votes
3 answers
307 views

Equality in prime number inequality

5 votes
2 answers
2k views

Representation as a sum of two squares

4 votes
3 answers
553 views

$1992$ IMO Functional Equation problem [duplicate]

4 votes
3 answers
306 views

A question on calculus

4 votes
1 answer
83 views

How to show that $Y\cup_{f} X$ is normal when $X$ and $Y$ are normal and $f:A\to Y$ is a continuous map with $A$ closed in $X$?

3 votes
0 answers
566 views

Please help in proving $ab=0 \space \forall a,b$ in a ring $R$ where the only right ideals of $R$ are the trivial ones and $R$ is not a division ring.

3 votes
1 answer
153 views

A complex number inequality

3 votes
2 answers
150 views

A problem on a sequence

3 votes
2 answers
80 views

Problem on functions

3 votes
2 answers
129 views

Sum of series ${n\choose 2a}{a\choose 0}+ {n\choose {2a+2}}{{a+1}\choose 1} + {n\choose {2a+4}}{{a+2}\choose 2} + \ldots$

2 votes
1 answer
140 views

Expressing as a sum of squares.

2 votes
2 answers
1k views

Are the axioms for the real numbers consistent?

2 votes
1 answer
163 views

Prove or disprove an inequality involving statistics

2 votes
2 answers
689 views

Which integers can be expressed as a sum of squares of two coprime integers?

2 votes
1 answer
834 views

Is $\tan (\pi x)$ never rational for all rational $x$ in the interval $(-0.5,0.5)$, with the exceptions occuring at $x=0, -0.25, 0.25$?

2 votes
2 answers
438 views

Odd and even functions.

2 votes
0 answers
108 views

A Proof-Library

2 votes
1 answer
72 views

Is it true that $\varinjlim\left( A_{i}\times B\right)\cong \left(\varinjlim A_{i}\right)\times B$ in topological spaces?

1 vote
0 answers
69 views

Let $M_{0}:=\{f \in C[0,1] \mid f(0)=0 \}$. Show that $M_0$ is not a finitely generated ideal of $C[0,1]$.

1 vote
2 answers
157 views

Does radical ideals $\sqrt{I_1}\subseteq\sqrt{I_2}\cdots$ becoming stationary imply ideals $I_1\subseteq I_2\cdots$ becoming stationary?

1 vote
4 answers
150 views

A Horrible looking limit

1 vote
1 answer
61 views

Perhaps similar number theory problems

1 vote
2 answers
136 views

Please find the mistake [duplicate]

0 votes
2 answers
381 views

Laws of indices

0 votes
1 answer
127 views

Rationals, irrationals and Continuity

0 votes
1 answer
127 views

$\lim_{n\rightarrow \infty} \frac {(n!)^{\frac {1}{n}}}{n}$ and $\lim_{n\rightarrow \infty} \frac {1}{n}\ln {2n \choose n}$

0 votes
1 answer
64 views

Help in proving that arc-connectedness is an equivalence relation in non-Hausdorff spaces.