October 5th, 2016, 12:46 PM  #1 
Newbie Joined: Oct 2016 From: Algeria Posts: 1 Thanks: 0  show that τ is not a topology
How do I solve this problem: Let τ be a set such asτ= {R, ∅} ∪ {Bq, q∈Q} where Bq=] q,+∞ [∩Q. Show that (R,τ) isn't a topological space.?

October 5th, 2016, 01:13 PM  #2 
Global Moderator Joined: May 2007 Posts: 6,206 Thanks: 489  

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