21. (6 marks) Let s denote your student id number. S i. (2 marks) Give an open subset of B((1),3) \ {(1)} of diameter ii
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21. (6 marks) Let s denote your student id number. S i. (2 marks) Give an open subset of B((1),3) \ {(1)} of diameter ii
21. (6 marks) Let s denote your student id number. S i. (2 marks) Give an open subset of B((1),3) \ {(1)} of diameter ii. (2 marks) Give an element of (Q *Q) n ((0, s] × (-s-, -s)). iii. (2 marks) Decide if the following set is open, closed, neither or both (1 mark), and compute its diameter (1 mark). ([-2,0] [0, 2]) U ([-1,5] x [-5,1]) U B((8),1)
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