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In words, the inequality says that the distance
z−i
between
z
and
i
should be strictly greater than
2
and less than or equal to
3. This means that the inequality defines an annular set having an inner radius of
2
and outer radius of
3, with centre at
i.
The inner dashed is not included in the set; on the other hand, the outer solid circle does.
z−i
