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D.B.
  • Member for 4 years, 4 months
  • Last seen more than 2 years ago
6 votes

Why does my calculator show a gap in the graph of $y=\left|\left(\sqrt[3]{x-3}+9\right)^5\right|$?

6 votes
Accepted

Understanding why the domain of a distribution is defined to be smooth functions with compact support

6 votes

Does this transcendental equation have solutions for a non real variable?

5 votes

Max product of $20$ numbers with mean $12$ if $n$-th number is $\frac{n}2$ or $2n$?

4 votes
Accepted

Is there a simple function that can make sin into a line? [$\sin(f(x)) = {2x\over\pi}$ from $0$ to $\pi\over2$]

4 votes

$4 \times 4$ matrix and homogeneous system of equations.

4 votes

How to check for polynomial

4 votes

Minimum value of integral

3 votes

$dx=dy$ is this correct?

3 votes
Accepted

Regarding existence of continuous function which is onto

3 votes

Proof: distance less than all small epsilon implies distance zero

3 votes
Accepted

If $n$ is divisible by 6, then $n$ is divisible by 3

3 votes

Finding the magnitude of the sum of two vectors

3 votes
Accepted

A problem of a linear ODE with order $n$

3 votes
Accepted

Show that a non-linear equation has exactly two roots

3 votes
Accepted

Prove that a specific function is injective...

2 votes

Determine the type of the correlation

2 votes
Accepted

How to generate a "log" series of number knowing the start and end?

2 votes

Prove that the level curves of $\log\frac{|z-\sqrt{z^2-1}|}{2}$ are ellipses

2 votes

How can I determine the coordinates of a point on the arc a circle if it has moved 2 units counter clockwise

2 votes
Accepted

Integration of a recursive function

2 votes
Accepted

Proof that $\sin {x}$ is infinitely continuously differentiable over $[m,n]$

2 votes

Solving for $x$ in $\sin^{-1}(2x) + \sin^{-1}(3x) = \frac \pi 4$

2 votes
Accepted

Calculate the argument of $ (-2{\sqrt 3} - 2i)^5$

2 votes

How to find interval where function $f(x)=x+\frac{1}{x^{3}}$ is one to one\injective?

2 votes

Does decimal point count as a digit of pi?

2 votes

Integers divisible by 5 but not divisible by 7 are countably infinite

2 votes
Accepted

How come that if Ax = W is consistent than a vector w is part of the Im A.

2 votes
Accepted

How to solve an electrostatic second order differential equation

2 votes
Accepted

Plot functions from $\mathbb R^2$ to $\mathbb R^2$