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Paul Gustafson's user avatar
Paul Gustafson's user avatar
Paul Gustafson's user avatar
Paul Gustafson
  • Member for 11 years, 2 months
  • Last seen more than 2 years ago
7 votes

Recreational number theory problem

5 votes

Are all groups of order 6 cyclic?

4 votes

How to prove when Möbius transformation determinant ad - bc < 0, the upper half plane does not map to itself?

3 votes

What goes wrong in this derivative?

3 votes

Finding the boundary of a set given by inequalities

3 votes

if $\phi : X \rightarrow X/N$ is onto implies $\operatorname{ker} \phi =N$

2 votes

Dimensions: $\bigcap^{k}_{i=1}V_i \neq \{0\}$

2 votes
Accepted

When does $\sum_n \sum_i a_nb_i = \sum_i \sum_n a_nb_i$

2 votes
Accepted

*Was sind und was sollen die* compact spaces?

1 vote

Question on measurable set

1 vote

approximating a riemann integrable function by sequences of step functions and sequences of continuously differentiable functions

1 vote

Graph of a measurable function

1 vote
Accepted

The multiplication of 2D vectors produces what?

1 vote

Constructing a degree 4 rational polynomial satisfying $f(\sqrt{2}+\sqrt{3}) = 0$

1 vote

If the sum of the distances is the distance from start to finish, show that the points are collinear

1 vote
Accepted

Geometry question using tangents and Pythagorus

1 vote

Question in Hungerford regarding field extensions

0 votes

v(1, 0, 0) -> v(0, -1, 0) with rotation matrix?

0 votes

How can the graph of an equivalence relation be conceptualized?

0 votes

Change of variables in multiple integral

0 votes

Prove that $H$ is a normal subgroup in the finite group $G=\langle S\rangle $ iff $sHs^{-1}$ $\subseteq H$ for all $s\in S$.

0 votes

Show that $\sum_{n=1}^{\infty} b_n$ is absolutely convergent

0 votes

How many bit strings of length 17 contain at least 5 ones?

0 votes

Measure nonzero implies dense on a rectangle

0 votes

Sets, functions and relations problem

0 votes

Determine if function is well defined

0 votes

what are the rules/rationale for "simplifying" negative denominators

0 votes

Intersection | Subspaces | Span

0 votes

Alternative Definitions of Convergence for Sequences

0 votes

derivatives and constants