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Complex Real Number Boundary In Topology

1	Complex
1	Real Number
2	Boundary In Topology

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Unit Disk

The unit disk in the complex plane, denoted $\Delta$ , is defined as $\{ z \in {\mathbb{C}}: \vert z\vert < 1 \}$ . The unit circle, denoted $\partial\Delta$ or is the boundary $\{z \in {\mathbb{C}}: \vert z\vert=1 \}$ of the unit disk $\Delta$ . Every element $z \in \partial\Delta$ can be written as $z=e^{i \theta}$ for some real value of $\theta$ .