User Saikat

18 votes

Big List of Erdős' elementary proofs

answered Jul 5, 2016 at 15:02

10 votes

Big List of Erdős' elementary proofs

answered Jul 6, 2016 at 4:53

9 votes

Proofs of AM-GM inequality

answered Feb 21, 2016 at 3:31

8 votes

Big List of Erdős' elementary proofs

answered Jul 6, 2016 at 2:51

7 votes

Big List of Erdős' elementary proofs

answered Jul 5, 2016 at 15:09

7 votes

Examples of fallacies in arithmetic and/or algebra

answered Jan 14, 2016 at 13:39

6 votes

Good "history of mathematical ideas" book?

answered Feb 27, 2016 at 17:33

4 votes

Should I be concerned if I cannot solve most exercises in my textbook?

answered Mar 5, 2016 at 4:45

4 votes

Accepted

Why does $\lim_{x\to0}\frac{\sin(x)}{x}$ equal $1$?

answered Feb 27, 2016 at 3:50

3 votes

Proof that $2^m+1$ is a prime number if $m=2^k$

answered Feb 22, 2016 at 13:04

3 votes

Big List of Erdős' elementary proofs

answered Jul 6, 2016 at 8:44

3 votes

Accepted

There are 4 nickle coins and 4 half nickle coins. How many different options are there for the sum of 5 coins.

answered Jun 30, 2016 at 16:38

2 votes

Proof: Sum of the combination of the these numbers are not equal.

answered Apr 19, 2016 at 16:28

2 votes

How to simplify $\lim_{n\to \infty}\sum_{r=1}^n \tan^{-1} \dfrac{2r+1}{r^4+2r^3+r^2+1}$

answered Jan 30, 2016 at 8:22

2 votes

How can I prove that only there continuous odd prime are $3,5,7$?

answered Feb 8, 2016 at 22:56

2 votes

How to Catch Up?

answered Feb 8, 2016 at 23:23

2 votes

Induction Proof for $F_{2n} = F^2_{n+1} - F^2_{n-1}$

answered Jan 25, 2016 at 11:21

2 votes

Any tips on integrating this? $\int \frac {dx} {a\sin^2x + b\cos^2x}$

answered Feb 21, 2016 at 3:36

2 votes

Find the smallest $a\in\mathbb{N}$, so that $a\equiv3\cdot 5^4\cdot 11\cdot 13^3 \pmod 7$

answered Feb 21, 2016 at 14:45

2 votes

Proof that the sum of the first $n$ odd numbers is $n^2$.

answered Feb 22, 2016 at 13:29

1 vote

Book recommendations

answered Dec 29, 2015 at 6:26

1 vote

Abstract Algebra Book Request

answered Dec 29, 2015 at 6:29

1 vote

Finding the prime number $n$: why checking for a divisor between 2 and $\lfloor \frac{n}{2} \rfloor$ is enough?

answered Jan 22, 2016 at 3:44

1 vote

Calculate the Derivative of the Integral

answered Jan 24, 2016 at 4:46

1 vote

Prove that $n^4-n^2$ is divisible by $8$ if $n$ is an odd positive integer.

answered Apr 5, 2016 at 3:01

1 vote

Big List of Erdős' elementary proofs

answered Jul 6, 2016 at 11:59

1 vote

Big List of Erdős' elementary proofs

answered Jul 11, 2016 at 12:12

1 vote

Big list of journals with free access to back issues.

answered Jul 31, 2016 at 11:40

1 vote

Big list of journals with free access to back issues.

answered Jul 31, 2016 at 11:45

1 vote

Accepted

Determine the probability, Such that array A is sorted after applying exactly $N$ swap operations on array $A.$

answered Feb 14, 2022 at 4:44

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40 Answers

Big List of Erdős' elementary proofs

Big List of Erdős' elementary proofs

Proofs of AM-GM inequality

Big List of Erdős' elementary proofs

Big List of Erdős' elementary proofs

Examples of fallacies in arithmetic and/or algebra

Good "history of mathematical ideas" book?

Should I be concerned if I cannot solve most exercises in my textbook?

Why does $\lim_{x\to0}\frac{\sin(x)}{x}$ equal $1$?

Proof that $2^m+1$ is a prime number if $m=2^k$

Big List of Erdős' elementary proofs

There are 4 nickle coins and 4 half nickle coins. How many different options are there for the sum of 5 coins.

Proof: Sum of the combination of the these numbers are not equal.

How to simplify $\lim_{n\to \infty}\sum_{r=1}^n \tan^{-1} \dfrac{2r+1}{r^4+2r^3+r^2+1}$

How can I prove that only there continuous odd prime are $3,5,7$?

How to Catch Up?

Induction Proof for $F_{2n} = F^2_{n+1} - F^2_{n-1}$

Any tips on integrating this? $\int \frac {dx} {a\sin^2x + b\cos^2x}$

Find the smallest $a\in\mathbb{N}$, so that $a\equiv3\cdot 5^4\cdot 11\cdot 13^3 \pmod 7$

Proof that the sum of the first $n$ odd numbers is $n^2$.

Book recommendations

Abstract Algebra Book Request

Finding the prime number $n$: why checking for a divisor between 2 and $\lfloor \frac{n}{2} \rfloor$ is enough?

Calculate the Derivative of the Integral

Prove that $n^4-n^2$ is divisible by $8$ if $n$ is an odd positive integer.

Big List of Erdős' elementary proofs

Big List of Erdős' elementary proofs

Big list of journals with free access to back issues.

Big list of journals with free access to back issues.

Determine the probability, Such that array A is sorted after applying exactly $N$ swap operations on array $A.$