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Paul Sundheim's user avatar
Paul Sundheim's user avatar
Paul Sundheim's user avatar
Paul Sundheim
  • Member for 10 years, 11 months
  • Last seen this week
9 votes
Accepted

Show that the limit of $\frac{\sin(x) - \sin(y)}{x+y}$ does not exist.

8 votes
Accepted

How do you transpose tensors?

7 votes

Product of two negative numbers is positive

7 votes

Solving $y^2 - yx - y + x = 0$ for $y$?

6 votes
Accepted

What is a French curve, as mentioned by Feynman?

6 votes
Accepted

How can I find the smallest enclosing circle for a rectangle?

6 votes

Prove that $\sin(\sqrt x)$ not periodic

6 votes

Mathematics - The big picture

5 votes

Why does $(a+b)^2= a^2+b^2 + 2ab$? Why is the $2ab$ there?

5 votes

How can I prove this integral is equal to f(0)?

4 votes
Accepted

The set of all vectors of the form $(a-4b,5,4a+b,-a-b)$ is not a vector space

4 votes

can have solution of $x^4-3x^3+2x^2-3x+1=0$ using only high school methods

4 votes

$\ln (2 x-5)>\ln (7-2 x)$

4 votes

Given that $f(x) = x + \frac{1}{x}$ where $x>1$, find $f^{-1}(x)$

3 votes
Accepted

does a positive/negative number cancel itself?

3 votes

What happens to a function when it is undefined?

3 votes

Exponents with Logs

3 votes
Accepted

What is the domain of this differential equation/its solution?

3 votes
Accepted

Factor the expression completely.

3 votes
Accepted

What justifies $(\frac{1}{2i})^{n-1}=(-\frac{i}{2})^{n-1}$?

3 votes
Accepted

Negative area below x-axis and above $f(x)$

3 votes

Find the equation of a plane that passes through $3$ points

3 votes

Use the fundamental theorem to evaluate the line integral?

3 votes
Accepted

Reverse knot and reflection

2 votes

Does the infinite series $1/(n+1)$ diverge?

2 votes

Every basis of P_4 contains at least one polynomial of degree 3 or less?

2 votes

Finding triangle using derivative in a graph

2 votes
Accepted

Cubic polynomial and its discriminant

2 votes

Finding a general solution to a differential equation, using the integration factor method

2 votes

Solving $ \frac{dy}{dx} = y^2 - 9$

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