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Mathematics
Dr. Ernesto Chinchilla's user avatar
Dr. Ernesto Chinchilla's user avatar
Dr. Ernesto Chinchilla's user avatar
Dr. Ernesto Chinchilla
  • Member for 4 years, 6 months
  • Last seen more than a month ago
  • Uruguay
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I am a 47-year-old retired scientist living off the grid in Uruguay.

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4
Constructing a Diffeomorphism between a Cone like and cylinder surface
Jan 29
3
If $f(z) = \sum_{n=0}^{\infty} a_n(z-z_0)^n$ has radius convergence $ R > 0$. if $f(z) = 0$ for all $z$ $|z-z_o| < R$ show that $a_0 = a_1 = ... =0$.
Oct 3, 2022
2
Find a linear fractional transformation that maps a line onto a circle.
Nov 6, 2022
1
Write $\cos(n \theta)$ as a combination of powers of $\cos(\theta)$ with integer coefficients.
Sep 15, 2022
1
Find all one to one analytic functions that map the upper half plane $U$ onto itself (Hint: $\phi(z) = i\frac{1+z}{1-z}$ the unit disc onto $U$).
Nov 9, 2022
1
$S = f^{-1}(\lambda)$ is non-empty. Is $\lambda$ is a regular value if and only if S is a regular surface?
Jan 28
1
Does a map that preserves distance imply isometry?
Mar 24
0
Power Series $(\sin(z))^2$ [duplicate]
Sep 30, 2022
0
Proof that $1/(cx+d)$ is analytic
Nov 3, 2022
0
Linear Fractional Transformation from $R_{\infty} \rightarrow R_{\infty}$
Nov 11, 2022
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5
Response of diode circuit