Daniel R's user avatar
Daniel R's user avatar
Daniel R's user avatar
Daniel R
  • Member for 10 years, 5 months
  • Last seen this week
20 votes

In calculus, which questions can the naive ask that the learned cannot answer?

13 votes

Is this a valid way to prove this modified harmonic series diverges?

10 votes
Accepted

Analytic continuation of factorial function

9 votes
Accepted

sum of 4 squares

8 votes

Numbers with no finite representation on paper

6 votes

Algebraic numbers and their closure

6 votes
Accepted

Trigonometric equation in two ways gives different answer

6 votes

One question to know if the number is 1, 2 or 3

6 votes
Accepted

Does there exist a finite group with orders of elements $1$, $2$, ..., $8$ (but no elements of larger order)?

6 votes

Working out $\tan x$ using sin and cos expansion

6 votes
Accepted

Asymptotic approximation to find the Barnes integral

6 votes
Accepted

Probability of an integer being a prime

5 votes

Is there any book/resource which explain the general idea of the proof of Fermat's last theorem?

4 votes

Difficult Polynomial Question

4 votes

Interesting but short math papers?

4 votes
Accepted

how covert joysitck (x, y) coordinates to robot motor speed?

4 votes
Accepted

Does this sequence always give a square number?

4 votes
Accepted

Describing a third variable with two other variables, using combination of elementary functions.

3 votes
Accepted

A double sum and its relation to a simple sum, is this an identity for any complex number $S=a+i b$ and any integers n and t?

3 votes
Accepted

Numerical values for $e^{z}$

3 votes
Accepted

Show $x^{\pi(x)} < 3^x$ using the PNT.

3 votes
Accepted

ratio of arithmetic summation

3 votes

Use induction to prove that $F_n \ge \sqrt 2 ^n$ for $n \ge 6$

2 votes

Significant figures reduction of solution

2 votes

Real zeros of the zeta function

2 votes
Accepted

If $f\in C[0,2\pi]$ and $f(0)=f(2\pi)$ then $f(\theta)=f(\theta+\pi)$ for some $\theta\,\in\,(0,\pi)$?

2 votes

Let $\sum_{n=1}^\infty \frac{a_n}{3^n}.$ Determine (numerically or not) the limit of the infinite series by choosing $a_n=0$ or $2$ randomly.

2 votes

How to solve $f_{n}(x)=xf_{n-1}(x)-f_{n-2}(x)$?

2 votes
Accepted

General term of a range

2 votes
Accepted

Sums of Squares of Fibonacci Numbers Using Difference Operators