user avatar
user avatar
user avatar
Anixx
  • Member for 11 years, 10 months
  • Last seen this week
62 votes

Is there a general formula for solving Quartic (Degree $4$) equations?

20 votes

Is it wrong to tell children that $1/0 =$ NaN is incorrect, and should be $∞$?

15 votes
Accepted

How to calculate $f(x)$ in $f(f(x)) = e^x$?

11 votes
Accepted

On the functional square root of $x^2+1$

11 votes

Does a non-trivial solution exist for $f'(x)=f(f(x))$?

7 votes

Is term "real number" equivalent to "group of algorithms generating stream of digits"?

7 votes

Using the rules that prove the sum of all natural numbers is $-\frac{1}{12}$, how can you prove that the harmonic series diverges?

6 votes
Accepted

How to express the Riemann hypothesis in terms of the Gamma function?

4 votes

Imaginary-Order Derivative

4 votes

Is there a function so that $f(f(x))=1/x$?

4 votes

Proof that no analytical solution exists for $x+e^{-x}=2$

3 votes

How is e to the hyperbola what pi is to the circle?

3 votes

Really advanced techniques of integration (definite or indefinite)

3 votes

Explaining $\cos^\infty$

3 votes

Sum of the Harmonic Series?

3 votes

On the functional square root of $x^2+1$

3 votes

How to approximate $\sum_{k=1}^n k!$ using Stirling's formula?

3 votes

Can every definite integral be expressed as a combination of elementary functions?

3 votes

What makes elementary functions elementary?

3 votes

No extension to complex numbers?

3 votes

Do any significant changes happen in hypercomplex numbers beyond the eight dimensions of the octonions?

3 votes

Is there a symbol for integrating and setting $C=0$?

2 votes

What is the difference between Quaternions and Bicomplex Numbers?

2 votes
Accepted

Is there an easier way to find the "natural" integration constant?

2 votes

If $f(x)+f'(x)-\frac{1}{x+1}\int_{0}^{x}f(t)dt=0$ and $f(0)=0$, then what is $f'(x)$?

2 votes
Accepted

Do there exist algorithms for which super computers are difficult to exceed personal computers in speed?

2 votes

Could negative integer factorials be defined in some way?

2 votes

Does Ramanujan summation evaluate the series $\sum \frac{1}{n^s}$ to $\zeta(s)$ or $\zeta(s)-\frac{1}{s-1}$?

2 votes

If $ f(f(f(x)))=x$, does$ f(x)=x$ necessarily follow?

2 votes

Cesàro sum of $\sum\limits_{n = 0}^\infty {\cos n}=\dfrac{1}{2}$. Please check my work

1
2 3 4 5 6