第5講 2.5 Closure of a set


L5_A
      
2.4 Accumulation points (補充)
 
        
L5_B
      2.5 Closure of a set(cont.)
            (1)definition 
            (2)Thm of the closure of a set A.
            (3)closure & ∩、∪,? 

 
L5_C
      2.5 Closure of a set(cont.)
            (1) cl(A) is the set of all points in M whose every
                 neighborhood meets A
            (2)或是cl(A)={x∈M | every neighborhood of x meets A}.

 
L5_D      
      2.6 Boundary of a set
            (1)definition of boundary
            (2)property of bd(A)
           (3)example:boundary of a ball

 

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