Anixx

### Questions (161)

 26 Has anybody ever considered “full derivative”? 16 Is there a name for the class of functions which are infinitely integrable in elementary functions? 16 Evaluate definite integral $\int_{-1}^1 \exp(1/(x^2-1)) \, dx$ 14 Is this similarity just a coincidence? 14 How this operation is called?

### Reputation (5,787)

 +10 What are the consequences if Axiom of Infinity is negated? +10 Is there a general formula for solving 4th degree equations (quartic)? +10 Really advanced techniques of integration (definite or indefinite) +10 If $f(f(f(x)))=x$, does$f(x)=x$ necessarily follow?

 47 Is there a general formula for solving 4th degree equations (quartic)? 20 Is it wrong to tell children that $1/0 =$ NaN is incorrect, and should be $âˆž$? 15 How to calculate $f(x)$ in $f(f(x)) = e^x$? 10 On the functional square root of $x^2+1$ 8 Does a non-trivial solution exist for $f'(x)=f(f(x))$?

### Tags (150)

 48 algebra-precalculus × 3 15 functions × 11 47 polynomials × 5 15 function-and-relation-composition × 3 47 quartic-equations 15 power-series × 3 43 functional-equations × 12 15 tetration 17 real-analysis × 14 12 riemann-zeta × 14

### Bookmarks (7)

 30 “Binomial theorem”-like identities 26 Proof that $\int x^x dx$ can't be done in terms of elementary functions? 13 Is there a formula similar to $f(x+a) = e^{a\frac{d}{dx}}f(x)$ to express $f(\alpha\cdot x)$? 10 No extension to complex numbers? 3 When do regularization methods for divergent series disagree?