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Riley's user avatar
Riley's user avatar
Riley
  • Member for 8 years, 3 months
  • Last seen more than a month ago
7 votes
Accepted

Eigenvalues of $A=vv^T$

6 votes
Accepted

Prove that $\alpha+\beta+\gamma=0$

6 votes
Accepted

Positive square rationals equidistant to 1

5 votes

Give an example of a quadratic function that has zeroes at $x=2$ and $x=4$, and that takes the value $6$ when $x=3$.

4 votes
Accepted

Logic: wff into symbols

4 votes
Accepted

Can a relation be reflexive on the empty set

4 votes
Accepted

Method for solving a 5x5 light puzzle

3 votes
Accepted

When the Lights Out puzzle vectors over elementary abelian field of dimension $n^2$ form a basis

3 votes
Accepted

$n \cdot n$ board, each square holds the number of rectangles that contain it

3 votes

What do you call a matrix where lower triangle is the negative of the upper triangle?

3 votes

Sum of series $\frac{x}{1-x^2} + \frac{x^2}{1-x^4} + \frac{x^4}{1-x^8} +\ldots$

3 votes

Find the radius of the largest circle

3 votes

Prove that if nine points are placed arbitrarily on a sphere S,then two of these points are no more than $r\sqrt{2}$ apart,where r is the radius of S.

3 votes
Accepted

Every $k$-connected graph is $k$-edge connected.

3 votes
Accepted

Letter permutations with restriction.

3 votes

$A=\frac{a}{7}+\frac{b}{7^2}+\frac{c}{7^3}+\frac{d}{7^4}$ where all variables are (0-6)

3 votes

Cartesian product of Power Sets

2 votes
Accepted

Recursive Induction Floor Proof Help

2 votes
Accepted

$5$ divides $2ax+b$ for some integer $a$,given $5$ does not divide $x$

2 votes

If $ \det\begin{bmatrix} a & b \\ c & d \end{bmatrix}=-2$, calculate:

2 votes
Accepted

Geometrically, what does raising a real number to a complex number do on the complex plane?

2 votes

A problem related to triangles

2 votes
Accepted

If two graphs are subgraphs of each other, are they isomorphic?

2 votes

Why are countable sets considered small?

2 votes
Accepted

How many ways are there to pick $r$ objects from $n$ objects when repetitions are allowed and either both the first and second...

2 votes
Accepted

Forming a recurrence relation for a worded problem

2 votes
Accepted

Evaluate $\int_{-7}^{-5}\frac{2}{y^4\sqrt{y^2-25}}dy$

2 votes
Accepted

Proof of shifted primorial periodicity of aggregated prime signatures

2 votes

if $a \ge b$, and $b \le 2$, can I say $a \ge 2$?

2 votes

Determining a slope and y-intercept from a piecewise function