Intereting Posts

clarification asked for 'difference between convolution and crosscorrelation?'
Proof for transformation of random variables formula
Evaluate the limit in $p$ and $q$
Extension of regular function
Topology such that function is continuous if and only if the restriction is.
Fourier Analysis and its applications
Proof of external product theorem using K-theory
A recurrence relation on two variables
Recommend a concise book on mathematical logic
What is the significance of the power of $3$ in the sequence of primes given by $\lfloor A^{3^n}\rfloor ?$
Can one avoid AC in the proof that in Noetherian rings there is a maximal element for each set?
Calculate $\lim_{x \to \infty} x – \sqrt{x^2 + 2x}$ without derivations
A little integration paradox
Evaluating $\lim\limits_{n\rightarrow \infty} \frac1{n^2}\ln \left( \frac{(n!)^n}{(0!1!2!…n!)^2} \right)$
Picard group of product of spaces

Find all complex numbers satisfying $\cos(z) = i$.

- How to express $\sin \sqrt{a-ib} \sin \sqrt{a+ib}$ without imaginary unit?
- Residue of complex function
- How do I show that a holomorphic function which satisfies this bound on reciprocals of integers is identically zero?
- $\int_0^{2\pi}e^{a \cos{\theta}}\cos({\sin{\theta}})\,d\theta$ using residues
- If $|f(z)|\lt a|q(z)|$ for some $a\gt 0$, then $f=bq$ for some $b\in \mathbb C$
- Algebraic Properties of Residues in Complex Analysis
- Conjecture about $A(z) = \lim b^{} ( c^{} (z) ) $
- Zeros of Fourier transform of a function in $C$
- Infinite Series $\sum\limits_{n=2}^{\infty}\frac{\zeta(n)}{k^n}$
- Type and number of points at infinity on Riemann surface

**Hint** Use the identity $\cos(z)= \frac{e^{iz}+e^{-iz}}{2}$ and then solve the resulting quadratic equation in $e^{iz}.$

- Finding the sum $\sum_{q=0}^{2016}\sqrt{2}^{\binom{q+3}{3}}$
- Approximation to $ \sqrt{2}$
- Why is $i^3$ (the complex number “$i$”) equal to $-i$ instead of $i$?
- Textbook clarification: $\log = \ln$
- The Average Height of an American is (Hypothesis Test)
- Divisibility by sum of digits
- $\int_0^1 \frac{{f}(x)}{x^p} $ exists and finite $\implies f(0) = 0 $
- Result of the product $0.9 \times 0.99 \times 0.999 \times …$
- How to show that the Laurent series of the Riemann Zeta function has $\gamma$ as its constant term?
- Question about radical of a module.
- How to prove that a bounded linear operator is compact?
- Looking for intuition behind coin-flipping pattern expectation
- let $(X,d)$ be a metric space. How I can show that any finite subset of $X$ is closed.
- $H_0(X) \cong \tilde{H}_0(X) \oplus \mathbb{Z}$ isomorphism in algebraic topology
- Relationship between covariant/contravariant basis vectors