Obviously, you squeeze the string to the fret, which shortens the string making a higher sound. But it occurred to me, that it’s awfully convenient that you need one in the same place for all the strings. And if it’s so awfully convenient, how come violinist put up with having to find the exact place to hold the strings, rather then getting frets?
Nothing. Or let’s be precise: not much. Both are things (nodes, vertices) connected by other things (links, edges) and any distinction is pretty much nothing but tradition. My PhD dissertation has a network science part. When I started writing about Erdős-Rényi graphs in this part I realized I had to clear up the relationship between the networks and graphs. After some research I tentatively wrote “Networks are essentially graphs”. Unfortunately, this statement did not resound well with one of my opponents, so I had to dig deeper.