Run the keygen application Enter the activation code provided by Autodesk How to redeem Please read the instructions on the activation page carefully. Download the redemption file to your computer and run it. Use the Autodesk Autocad Serial Number which you got on activation How to get more If you have some more Autodesk Autocad serial numbers, you can download the software to a different computer, reinstall it, activate it again, and you can get more serial numbers. It’s so simple. A: This is the keygen that I received from Autodesk support The following page is where you can get the keygen for your version of Autocad and your operating system: Q: Prove that the set $\{(x,y,z):x^2+y^2+z^2=1\}$ is closed in $\mathbb R^3$ Prove that the set $\{(x,y,z):x^2+y^2+z^2=1\}$ is closed in $\mathbb R^3$ Could someone explain to me how to solve this problem? I am looking for a way to prove this, like a suggestion of a counter example. I tried to prove this by contradiction. Say that the set is not closed and let $(x_n,y_n,z_n)$ be a sequence of points of the set that converges to a point $(x,y,z)$ that isn’t in the set. My idea was to consider a subsequence of $(x_n,y_n,z_n)$ and show that this subsequence converges to the same limit point. But I don’t know how to do that. A: Since $\left(x_n, y_n, z_n\right) \in \left\{(x, y, z) \in \mathbb{R}^3 : x^2+y^2+z^2=1\right\}$, then $\left(x_n, y_n, z_n\right)$ is a solution of the equation. This implies that \$\left\|\left(x_n, y_