- #1
wayneckm
- 68
- 0
Hello all,
Indeed I am quite confused with the definition of neighborhood of a point x since I come across two versios of it.
The first one is simply defined as open set of x while the second one is defined as a set containing an open set of x.
Apparently these two are different notions, e.g. (x-a, x+a], in first one this is not a neighborhood while the second one it is.
So which one is the right one? Thanks very much.
Wayne
Indeed I am quite confused with the definition of neighborhood of a point x since I come across two versios of it.
The first one is simply defined as open set of x while the second one is defined as a set containing an open set of x.
Apparently these two are different notions, e.g. (x-a, x+a], in first one this is not a neighborhood while the second one it is.
So which one is the right one? Thanks very much.
Wayne