L2_A
      2.1 Open Sets (cont.)

           (1)in R(of different dimension)

           (2)examples for open sets     

 

L2_B
      2.1 Open Sets (cont.)

            (1)some convention in open sets

            (2)∩、∪與 open sets

 

L2_C
      2.1 Open Sets (cont.)

            (1)effect of translation and dilation 

 

L2_D
      2.1 Open Sets (end.)