I've read a lot of articles on the internet, watched youtube videos on this topic and the explanation seems to be clear. But when it comes to practice, I'm often struggling with choosing correct articles. Especially, when talking about something more or less scientific or abstract.
Say, "Euclidean Space".
- Should it be "THE Euclidean space", because it's kind of a "family of spaces"?
- Or "A Euclidean space", because we're talking about some particular type of space, one of many.
- Or should it be used without any article at all, because of the "space" word it contains, which is general enough to be referred to in this way?
What rule to follow to decide which usage is correct in such cases?