I want to connect my home ubuntu server with ssh from remote. So i bought static ip address from my provider. But i don't know how to set up it correctly.  I have done something like that in /etc/netplan/50-cloud-init.yaml  network:   version: 2   renderer: networkd   ethernets:     enp0s5:      dhcp4: no      addresses: [&lt;my_ip&gt;/24]      gateway4: &lt;my_ip&gt;      nameservers:        addresses: [8.8.8.8,8.8.4.4]   And after  sudo netplan apply   But it haven't work for me. (Sorry if it is a dumb question)
let's imagine i am at school with an android phone. I have a computer at home and that computer has a virtual machine working on it. here is the scenario, client and virtual client has ssh-client and ssh-server both and they can communicate each other in the local network.  when i want to connect to my virtual client from school by android phone through internet there must be an ip address.  the problem is virtual machine and client has the same public ip. so how do i connect one of the two machines?
What is the origin of non-conservative force? My understanding about  is a force that its work is independent of path such that we can construct another form of the work called potential to make our life easier.  For friction, if I start from microscopic point of view, it should be the macroscopic effect of the electric force or gravity which are both conservative force.  Why do we initially have description by conservative forces (electric/gravity force) but end up with a macroscopic description of nonconservative force(friction)? Check whether $\sum _{m=1}^{\infty }\sum _{n=1}^{\infty }\frac{1}{\left(m+n\right)^2}$ converges or NOT? Note that (1) all norms on finite dimensional vector space are equivalent.  And here (2) norms on vector space are equivalent iff they have same topology.   Question : How can we prove (2) ? Please recommend reference  Thank you in anticipation Limit memory usage for a single Linux process I'm running pdftoppm to convert a user-provided PDF into a 300DPI image.  This works great, except if the user provides an PDF with a very large page size.  pdftoppm will allocate enough memory to hold a 300DPI image of that size in memory, which for a 100 inch square page is 100*300 * 100*300 * 4 bytes per pixel = 3.5GB.  A malicious user could just give me a silly-large PDF and cause all kinds of problems.  So what I'd like to do is put some kind of hard limit on memory usage for a child process I'm about to run--just have the process die if it tries to allocate more than, say, 500MB of memory.  Is that possible?  I don't think ulimit can be used for this, but is there a one-process equivalent? Finding multivariable limits for the function $\frac{3x^2y}{x^2+y^2}$ Great Expectations [is written vs has been written] by Charles Dickens I had a grammar quiz at the university today.    One of the questions was:     "Great Expectations" ____ by Charles Dickens.      a) is written   b) has been written   c) was written    Undoubtedly, the c option isn't correct since the time (the publication date) isn't stated or implied.  I crossed the a option out because it is neither a general truth nor a law. It is not a well-known fact to use present simple here.  Finally, I have chosen b. I still have doubts if a is the only right option.   It is unclear to me. Could you clarify it? Any help would be appreciated. What does why would I do it mean in this context? I've often heard people saying this. And even I say it when someone accuses me of doing something that I didn't do.  I'd say:  Why would I do that?  But what's the grammar behind it?  Is it future from the past tense or something or what? It's obviously not a conditional construction 😒  Context from SE01 EP02 Austin &amp; Ally  Austin: what does the jacket have to do with the music video?  Trish: It's a line in Ally's song, "my jacket's in the lost and found."  Ally: "my jacket"? It says "I like it." The line is "I like it when you hang around."  Dez: "hang around"? I thought it said "kangaroo." ♪ I like it when you kangaroo. ♪.  Ally: Why would I write "I like it when you kangaroo"? The reason that I ask is because this is happening to LiDAR, and I am inclined to use lidar because it is easier to read. Typical Japanese style anime art, it was a series.   It has been around for more than 6 years. I think it mixed fantasy and sci-fi. It was certainly not Isekai and it has no magic, it feels more like revered science. A boy gets a gem embedded into his arm after a terrorist attack and transforms into a white and orange humanoid being. There are more people able to transform into these beings. There is also a red flying ship with a dark yellow underbelly that throws boxes with parachutes. There is also this top-secret laboratory where the scientists study how to battle against the beings. There are some other flying ships of varying colors. If I remember correctly, the protagonist gets amnesia near the end of the plot. Emulate "double" using 2 "float"s Maximum number of edges in a bipartite graph Prove that for a bipartite graph $G$ on $n$ vertices the number of edges in $G$ is at most $\frac{n^2}{4}$.     I used induction on $n$.    Induction hypothesis: Suppose for a bipartite graph with less than $n$ vertices the result holds true.    Now take a bipartite graph on $n$ vertices.Let $x,y$ be two vertices in $G$ where an edge exist between $x$ and $y$. Now remove these two vertices from $G$ and consider this graph $G'$. $G'$ has at most ${(n-2)^2}\over4$. Add these two vertices back.  Then the number of edges $G$ can have is at most    $$|E(G')|+d(x)+d(y)-1$$   My question is in my proof I took $d(x) + d(y) \le n$, where $d(x)$ denotes the degree of vertex $x$.  Can I consider $d(x)+d(y) \leq n$? I thought the maximum number of edges is obtained at the situation $K_{\frac n 2,\frac n 2}$ Number of non-isomorphic groups of order 21 Endpoint of a line knowing slope, start and distance In a Cartesian system, I've got the slope, start point and distance of a line segment.  What's the formula to find the endpoint? Get the cartesian product of a series of lists? Exclusive lighting Is (or will be) there any sort of light linking in Cycles, or a method to get a light to affect only certain objects that doesn't involve compositing two or more different render layers? Sort of what 3Dstudio does with the Include/Exclude methods. I have to deal with a large number of files nested inside of directories (one file per directory), resembling something like this:  fred/result.txt john/result.txt mary/result.txt ...   I am currently using the following command to process each of those files:  find . -maxdepth 1 -type d \( ! -name . \) -exec bash -c \"cd '{}' &amp;&amp; processResult result.txt\" \;   I am looking for something I can add into the end of this command that will change the filenames to fred.txt, etc. and then later move the file into the parent directory to eliminate the extra layer of directories.  What would be the best way to do this? I know that VARIABLE=value creates an environment variable, and export VARIABLE=value makes it available to processes created by the current shell. env shows the current environment variables, but where do they live? What comprises an environment variable (or an environment, for that matter)? How to determine the encoding of text? Does anyone know how to make the character picker appear more quickly?   I use it enough now in my German language studies that it has become second nature for the critical marks and much faster than using the alt+keypress shortcuts.   Only problem is that it's so second nature that sometimes it doesn't pop up quickly enough so I end up typing the character and the number shortcut sometimes (IE u2 instead of ü). Anyone know how to make it appear with less delay? Ideally, I'd love if I could just hold the character and press the number but it appears that OSX insists on waiting for the menu to pop up. What is the need of exponential generating functions on combinatorial problems? I've been introduced in my last lectures. And for the following problem:     Having 3 different types of books $a,b,c$ in how many ways can we take four different books putting them in a shelf such that the book $a$ can only be taken at most $1$ time, $b$ can be taken at most $3$ times and $c$ can only be taken at most $2$ times?   The ordinary generating function for this problem is:  $\quad \quad \quad \quad \quad \quad \quad $  Looking at the exponential generating function of the same problem, the only part of interest is the coefficient of $x^4$, which is:  $$\left(\frac{ab^3}{1!3!}+\frac{b^3c}{3!1!}+\frac{ab^2c}{1!2!1!}+\frac{b^2c^2}{2!2!}+\frac{abc^2}{1!1!2!}\right)$$ And then multiply it by $4!/4!$. But why do I need an exponential generating function? Isn't only needed to take the coefficient of $x^4$, divide each term of it by $a_1!a_2!\dots a_n!$ with $a_n=\text{power of a,b,c,}\dots$ and then multiply it by $4!4!$? It's not clear why such complication is needed.  By complication I mean to expand that generating function with the factorials, I could expand the ordinary generating function and then artificially add the factorials.