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Claude Leibovici
  • Member for 9 years
  • Last seen this week
  • Pau, France
246 votes
4 answers
13k views

A 1,400 years old approximation to the sine function by Mahabhaskariya of Bhaskara I

27 votes
1 answer
834 views

Could these polynomials be identified?

25 votes
5 answers
2k views

How could I improve this approximation?

18 votes
3 answers
2k views

Is it possible to justify these approximations about prime numbers?

16 votes
1 answer
2k views

Could this approximation be made simpler ? Solve $n!=a^n 10^k$

16 votes
2 answers
596 views

Where am I violating the rules?

16 votes
3 answers
542 views

What could be this number?

15 votes
1 answer
383 views

Could you explain me the use of fractional derivatives?

14 votes
1 answer
447 views

Searching for tighter bounds

14 votes
2 answers
362 views

About the first positive root of $\sum_{k=1}^n\tan(kx)=0$

11 votes
1 answer
294 views

Is there an analytical solution to $\int_1^\infty \frac {dx}{\prod_{i=0}^n (x+i)}$

11 votes
5 answers
352 views

Approximation of $\Big[\Gamma(1+x)\Big]^{-1}$ for $0 \leq x \leq 1$ (for the art for art's sake).

11 votes
1 answer
236 views

Could this conjecture be proved ? (sum of even powers of cotangents in arithmetic progression )

9 votes
3 answers
199 views

Approximating $\int \log\big[1+\sin^2(t)\big]\,dt$

8 votes
5 answers
3k views

Lambert function approximation $W_0$ branch

7 votes
2 answers
438 views

Probabilities playing bridge

7 votes
1 answer
192 views

What could be these polynomials?

6 votes
1 answer
170 views

How to prove that $4 \cot ^{-1}\left(\sqrt{\phi }\right)+\cot ^{-1}\left(\frac{1}{4} \sqrt{22+17 \sqrt{5}}\right)=\pi$

6 votes
2 answers
130 views

Solution of $W_0(x)-W_{-1}(x)=1$

6 votes
2 answers
143 views

Is there a limit for this complex sequence?

5 votes
3 answers
185 views

Approximation of $\prod _{k=p+1}^{\infty } \cos \left(\frac{p \,\pi}{2 k}\right)$

5 votes
0 answers
90 views

"Solving" for $n$ the equation ${2n\brack n}=k$ (Stirling numbers of the first kind)

5 votes
1 answer
169 views

An happy coincidence for the approximate solution of $x \tan(x)=k $?

5 votes
0 answers
233 views

Is there any hope for an analytical solution of this integral?

5 votes
3 answers
176 views

Probability of a boring afternoon

5 votes
0 answers
114 views

Approximate solution of $\Gamma(x+a)=k\, \Gamma(x+1)$ for $0 \leq x \leq a$

4 votes
1 answer
91 views

How to prove this identity involving Lerch function?

4 votes
0 answers
73 views

Approximation of harmonic numbers and their analytical inverse.

4 votes
2 answers
137 views

Approximate solution of $H(x)=(x!)^k$

4 votes
0 answers
76 views

Selecting degrees for a given number of terms in Pade approximants