General topology: Prove a Set is Open

  • #36
lep11 said:
What's wrong?

Come on! If you take a positive number away what you have gets smaller.
 
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  • #37
PeroK said:
Come on! If you take a positive number away what you have gets smaller.
Okay, true.

I might just give up. I am not smart enough to study crap like this.
 
  • #38
lep11 said:
Okay, true.

I might just give up. I am not smart enough to study crap like this.
I took a break and tried again.

##d(0,z)≥d(0,x)-d(x,z)≥r+1-d(x,z)>r+1-r=1##
 
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  • #39
Thank You PeroK!
 
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