User Fred Akalin - Mathematics Stack Exchange

13 votes

Accepted

Intersection of a line and a curve.

answered Jun 7, 2017 at 6:31

5 votes

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If polynomial $ax^4 +bx^2 +c$ has four real roots?

answered Jun 8, 2017 at 1:41

5 votes

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Let $A$ be an abelian group of order $2^{100}$. Prove that $A$ is not a subgroup of $S_n$ for $n<200$.

answered Dec 7, 2023 at 9:12

3 votes

Find exponent of prime $p$ in prime factorization of a number $x$

answered Jun 7, 2017 at 7:22

2 votes

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Localizing $\mathbb{Z}[X]/(2X, X^2)$ at $(2, X)$

answered Dec 27, 2018 at 9:46

2 votes

Vector Field on the Real Projective Plane

answered Apr 19, 2021 at 2:37

2 votes

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Is the exponential of a linear operator T still a linear operator?

answered Apr 16, 2022 at 4:45

1 vote

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Is $\mathcal{Z}(xy-z^2)$ isomorphic to $\mathbb{A}^2$ for a not algebraically closed field?

answered Feb 4 at 1:47

1 vote

Relating the tangent plane with vectors perpendicular to a graph of a surface

answered Jun 8, 2017 at 2:39

1 vote

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What is the correct formula for the Ricci curvature of a warped manifold?

answered Jan 16, 2018 at 9:49

0 votes

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Simple representation for continuous vector fields

answered Jun 7, 2017 at 7:59

0 votes

Path-Connectedness of Inverse Mapping

answered Jun 7, 2017 at 6:58

0 votes

How do I isolate a double exponent?

answered Jun 7, 2017 at 5:52

0 votes

Plasuible Argument that $A$ must be an interval where $A \in R$ be path-connected.

answered Jun 7, 2017 at 6:22

0 votes

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power series of $\frac1{3+x^2}$

answered Dec 9, 2023 at 0:23

0 votes

Question about definition of integral curve (Marsden and Hughes)

answered Feb 3 at 23:05

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16 Answers

Intersection of a line and a curve.

If polynomial $ax^4 +bx^2 +c$ has four real roots?

Let $A$ be an abelian group of order $2^{100}$. Prove that $A$ is not a subgroup of $S_n$ for $n<200$.

Find exponent of prime $p$ in prime factorization of a number $x$

Localizing $\mathbb{Z}[X]/(2X, X^2)$ at $(2, X)$

Vector Field on the Real Projective Plane

Is the exponential of a linear operator T still a linear operator?

Is $\mathcal{Z}(xy-z^2)$ isomorphic to $\mathbb{A}^2$ for a not algebraically closed field?

Relating the tangent plane with vectors perpendicular to a graph of a surface

What is the correct formula for the Ricci curvature of a warped manifold?

Simple representation for continuous vector fields

Path-Connectedness of Inverse Mapping

How do I isolate a double exponent?

Plasuible Argument that $A$ must be an interval where $A \in R$ be path-connected.

power series of $\frac1{3+x^2}$

Question about definition of integral curve (Marsden and Hughes)