This is not the price to access a paper. This is the price to publish one paper.
It really depends on the country. France and Belgium, as you wrote. Germany, they expect a tip and look at you angry if you don't. Italy, they add a service charge at the end that is nowhete advertised. Turkey, they invent a random price at the end, complaints only taken if you're local. (I'm slightly exaggerating)
You want an answer?
So you've probably learned that if u is an eigenvector, then multiplying u by any scalar gives you another eigenvector with the same eigenvalue. That means that the set of all a*u where a is any scalar forms a 1-dimensional space (a line if this is a real vector space). This is an eigenspace of dimension one. The full definition of an eigenspace is as the set of all eigenvectors of a given eigenvalue. Now, if an eigenvalue has multiple independent eigenvectors, then the set of all eigenvectors for that eigenvalue is is still a linear space, but of dimension more than one. So for a real vector space, if an eigenvalue has two sets of independent eigenvectors, its eigenspace will be a 2-dimensional plane.
That's pretty much it.
Whenever someone asks me why I don't use graphical user interface, I tell them that "graphical" comes from the Greek word for "to write", so my command line is actually a GUI
You can't add hydroxyapatite to water because it's not water soluble
Oh mein Gott, ist das eine RTL-Samstag-Nacht-Referenz?!?
French Guyane is in grey on both graphs. The country that stands out is I think Guyana
The number of employees with chronic back, knee and joint problems that manifest only years later when they don't work at Kohl's anymore and thus are not visible to management has skyrocketed. – What actually actually happens
Call her "despotic" because she has no spots
Oligocorn
Taft fat is a palindrome is not a palindrome, says Dr. Dsyase Mordnila Patonsie Mordnila Pasi Taft fat.