Find out the kernel of $\phi $?
32443
Find the kernel of a ring homomorphism $f(x)\to f(\sqrt 2)$
104413
Is the exponential of $-d$ a positive definite kernel for a general metric space $(X, d)$?
24653
Integral in $n-$dimensional euclidean space
9753
How to solve the equation $\phi(n) = k$?
136623
Hints/ Solution in finding a formula $\phi(n)$ for a binary square matrix
20581
How to show that $\Gamma\vdash (\varphi\to\neg\varphi)\to\varphi$?
48492
KL divergence of q(z|x) || p(z|x)
142097
Finding the dimension of the orthogonal complement
65889
Showing $\Phi(x)=\int_0^x (x-t)f(t)\,dt$ is twice differentiable and finding $\Phi''(x)$
138819
Prove that $\phi(n) \geq \sqrt{n}/2$
177
How can I calculate $\int^{\infty}_{-\infty}\Phi\left(\frac{w-a}{b}\right)\phi(w)\,\mathrm dw$
12976
Prove $\displaystyle\lim_{n\to\infty}\phi(n)=\infty$.
103924
Kernel of a substitution map
144819
Proving $P(n) =n^{\phi(n)} \prod\limits_{d \mid n} \left(\frac{d!}{d^d} \right)^{\mu(n/d)}$
4530
For which natural numbers are $\phi(n)=2$?
50037
Proving that kernels of evaluation maps are generated by the $x_i - a_i$
149509
What method would you go through to find an $n$ such that $\phi(n)=100$?