Solution 3.2:2f

From Förberedande kurs i matematik 2

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In words, the inequality says that the distance <math>|z-i|</math> between <math>z</math> and <math>i</math> 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 <math>i</math>.
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The inner dashed circle is not included in the set; on the other hand, the outer solid circle does.

Current revision

In words, the inequality says that the distance \displaystyle |z-i| between \displaystyle z and \displaystyle 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 \displaystyle i.

The inner dashed circle is not included in the set; on the other hand, the outer solid circle does.