Question: Determine whether or not the given set is (a) Open, (b) Connected, (c) Simply-connected. {(x, y) | x 2 + y 2 1 or

Determine whether or not the given set is 

(a) Open,

(b) Connected, 

(c) Simply-connected.

{(x, y) | x2 + y2 ≤ 1 or 4  x2 + y2 ≤ 9}

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