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EthanAlvaree's user avatar
EthanAlvaree's user avatar
EthanAlvaree's user avatar
EthanAlvaree
  • Member for 10 years, 6 months
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8 votes

Four complex numbers $z_1,z_2,z_3,z_4$ lie on a generalized circle if and only if they have a real cross ratio $[z_1,z_2,z_3,z_4]\in\mathbb{R}$

6 votes

Why get the sum of squares instead of the sum of absolute values?

4 votes

How do you solve this fraction?

3 votes
Accepted

Suppose all partial derivatives of $f$ exist at $x_0$; is $f$ continuous at $x_0$?

2 votes
Accepted

Probability that Three Numbers Drawn Represent Sides of a Triangle

2 votes

Real and imaginary parts of the Möbius transformation

2 votes

How to Change Summation Expression $\sum_{i=1}^N \mathbf{X}_i^{\top}\mathbf{\Omega}^{-1}\mathbf{X}_i$ into Matrix Expression

2 votes

How to prove $f(n)=\lceil\frac{n}{2}\rceil$ is one-to-one and onto?

1 vote
Accepted

Taking the Derivative: Power Rule with Respect to Vector

1 vote
Accepted

When does $x^{q'}-x$ divide $x^q-x$ in $\mathbb{Z}[x]$?

1 vote

Applying Cauchy's Integral Theorem to $\int_{C_R} z^n \ dz$

1 vote

Is the Square Root of an Inverse Matrix Equal to the Inverse of the Square Root Matrix?

0 votes

infimum and supremum finding

0 votes
Accepted

For each of the following sets, determine whether 2 is an element of that set

0 votes

Prove for some $z_0 \in C$ the function $f(z)=|z-z_0|$ is continuous on all of $\mathbb{C}$

0 votes
Accepted

Construct sequence of disjoint sets from monotonic sequence of sets

0 votes

What to do when there is a common factor in the limits of an integral?