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Eman Yalpsid
  • Member for 8 years, 9 months
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27 votes

Why isn't $f(z)=\bar{z}$ complex differentiable

22 votes

Complex modulus of $\left|\frac{-3z+2i}{2iz+1}\right|$ given that $\left|z\right|=\frac{1}{\sqrt3}$

8 votes

How to obtain the gradient in polar coordinates

6 votes

specifying which sequences converge equivalent to specifying topology

6 votes
Accepted

Determinant of $P_n$

5 votes
Accepted

Find the number of routes

5 votes
Accepted

Characteristic polynomial of a matrix in block form

5 votes
Accepted

Why does the $\sigma$-algebra generated by a random variable contain $\emptyset$, and $\Omega$?

4 votes
Accepted

Eigenvalues and determinant

4 votes
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Dimension of vector space in P3

4 votes
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DFA with an accepting state in the initial state

4 votes
Accepted

Determinant of a matrix subtraction/addition

4 votes
Accepted

Why this proof of 'absolute convergence $\implies$ convergence' works for complex sequences?

4 votes

If double derivative test fails can we go for Higher derivatives

4 votes
Accepted

Decreasing sequence of non-negative Lebesgue measurable functions and MCT

3 votes

find the rate of change $f(x) = 4\sin^3 x$ when $x = \frac{5\pi}{6}$

3 votes

How to prove these properties of vector subspaces

3 votes

Finding a closed form for a recurrence relation $a_n=3a_{n-1}+4a_{n-2}$

3 votes
Accepted

Is $f(x)=\sum_{n\geq 1}\frac{(-x)^n}{n^2+1}$ convex at $x=0$?

3 votes
Accepted

Geometric interpretation of the quotient vector space

3 votes

Show $U_A$ is a unitary operator.

3 votes

Doubt about gradient vector

3 votes
Accepted

Derivative of matrices product AXA^T with respect to A. (Plus result when A is a vector.)

2 votes
Accepted

Discrete Dirichlet problem. What's wrong with my solution?

2 votes
Accepted

Analytic solution to ODE: $\frac{dy}{dt} = -100y +100t +1$

2 votes
Accepted

Area of an annulus through integration

2 votes
Accepted

How to derive the supremum of a set over a unit ball

2 votes
Accepted

Expand $\dfrac{z}{(z-1)(2-z)}$ in the Laurent series valid for $|z-1|>1$.

2 votes
Accepted

Subset Notation.

2 votes
Accepted

Could multiplication be defined as $|A_1 \cup A_2 \cup ..A_n|$?