what is connected region ?

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A region is said to be connected region if any two points of region D can be connected by a curve which lies completely within the region.
what is connected region ?
It is of two types
(i) Simply connected region
(ii) multi connected region 

(i)Simply connected region
A connected region is said to be a Simply connected if all the interior points of a closed curve C drawn in the region D are the points of the region D.
e.g
(ii) multi connected region
A domain or range which is not simply connected is called multi connected region.
e.g






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