Question

Doubts regarding singularity and regularity of algebraic curves.

score 78 · Answer 1 · 2026-02-23 08:24:06

78

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Doubts regarding singularity and regularity of algebraic curves.

Published on 23 Feb 2026 - 8:24

score 199 · Answer 2 · 2020-03-06 13:48:57

199

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How to identify and classify singularities of $\frac{\sin(z)}{1-\tan(z)}$

Published on 06 Mar 2020 - 13:48

score 71 · Answer 3 · 2026-03-26 09:27:05

71

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How to prove the Laurent series converges to the right thing?

Published on 26 Mar 2026 - 9:27

score 27 · Answer 4 · 2020-03-06 16:57:20

27

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Classifying $0; -3; -1$ for $\frac{z-3}{(z^2-9)z}e^{\frac{1}{1+z}}$ and is $3$ even a singularity?

Published on 06 Mar 2020 - 16:57

score 47 · Answer 5 · 2020-03-07 14:35:05

47

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What is the class of the singularity $5$ for $\exp(\frac{z}{z-5})$

Published on 07 Mar 2020 - 14:35

score 64 · Answer 6 · 2020-03-07 17:26:22

64

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Power series representation of $\frac{1}{1-e^z}$ to classify singularity.

Published on 07 Mar 2020 - 17:26

score 119 · Answer 7 · 2020-03-07 18:33:39

119

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Calculate the poles and singularity of $f(z)=\frac{z\sin z}{(1-e^z)^3}$

Published on 07 Mar 2020 - 18:33

score 155 · Answer 8 · 2020-03-08 11:40:13

155

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When is the limit argument sufficient for showing poles?

Published on 08 Mar 2020 - 11:40

score 138 · Answer 9 · 2020-03-09 01:08:10

138

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Singularity of Hyperbolic PDE $u_x+2 (x+\sqrt{x^2-y}) u_y=0$

Published on 09 Mar 2020 - 1:08

score 72 · Answer 10 · 2020-03-09 09:25:33

72

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I thought that A.T@A always leads to invertible (non-singular) matrix? But no?

Published on 09 Mar 2020 - 9:25

score 448 · Answer 11 · 2020-03-09 13:20:18

448

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Is $\lim_{z \rightarrow z_0} zf(z) = 0$ sufficient to show $f(z)$ has a removable singularity or must we check $\lim f(z)$?

Published on 09 Mar 2020 - 13:20

score 59 · Answer 12 · 2020-03-14 07:05:44

59

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Can a map from the disk with exploding phase be smooth at the origin?

Published on 14 Mar 2020 - 7:05

score 94 · Answer 13 · 2020-03-16 14:09:05

94

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The value of the integral $\oint_{|z|=1}\frac{1}{\sin \left ( e^{\frac{-1}{z}}\right)}$

Published on 16 Mar 2020 - 14:09

score 87 · Answer 14 · 2020-03-19 10:02:49

87

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Can $\psi(x)\cos(\phi(x)),\,\, f_2(x)=\psi(x)\sin(\phi(x))$ be $C^{\infty}$ at zero when $\phi'$ explodes?

Published on 19 Mar 2020 - 10:02

score 73 · Answer 15 · 2020-03-23 17:46:52

73

Views

Singular point at Neumann Boundary Condition

Published on 23 Mar 2020 - 17:46

List Question

Doubts regarding singularity and regularity of algebraic curves.

How to identify and classify singularities of $\frac{\sin(z)}{1-\tan(z)}$

How to prove the Laurent series converges to the right thing?

Classifying $0; -3; -1$ for $\frac{z-3}{(z^2-9)z}e^{\frac{1}{1+z}}$ and is $3$ even a singularity?

What is the class of the singularity $5$ for $\exp(\frac{z}{z-5})$

Power series representation of $\frac{1}{1-e^z}$ to classify singularity.

Calculate the poles and singularity of $f(z)=\frac{z\sin z}{(1-e^z)^3}$

When is the limit argument sufficient for showing poles?

Singularity of Hyperbolic PDE $u_x+2 (x+\sqrt{x^2-y}) u_y=0$

I thought that A.T@A always leads to invertible (non-singular) matrix? But no?

Is $\lim_{z \rightarrow z_0} zf(z) = 0$ sufficient to show $f(z)$ has a removable singularity or must we check $\lim f(z)$?

Can a map from the disk with exploding phase be smooth at the origin?

The value of the integral $\oint_{|z|=1}\frac{1}{\sin \left ( e^{\frac{-1}{z}}\right)}$

Can $\psi(x)\cos(\phi(x)),\,\, f_2(x)=\psi(x)\sin(\phi(x))$ be $C^{\infty}$ at zero when $\phi'$ explodes?

Singular point at Neumann Boundary Condition

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