- #1
kingwinner
- 1,270
- 0
http://www.geocities.com/asdfasdf23135/advcal18.JPG
Well, I don't get the idea of the proof at all...
I have no clue why they can let U be an open ball. Not all open sets are balls, and if they let U be an open ball, it doesn't not seem to me that the proof has covered ALL possibilities of open sets U with the given property.
Can someone please explain?
Well, I don't get the idea of the proof at all...
I have no clue why they can let U be an open ball. Not all open sets are balls, and if they let U be an open ball, it doesn't not seem to me that the proof has covered ALL possibilities of open sets U with the given property.
Can someone please explain?