Question:medium

Which of the following holds for complex variable $z$:
A. Let $C$ be the unit circle $z = e^{i\theta}, (-\pi \le \theta \le \pi)$. Then $\int_C \frac{e^{iz}}{z} dz = 2\pi i$ B. The $\{z \mid 1 < |z| < 2\}$ set is simply connected. C. $\frac{1}{1+z} = \sum_{n=0}^{\infty} z^n$, whenever $|z| < 1$ D. The unit disk $\{z \mid |z| < 1\}$ is simply connected. E. If $f$ is analytic at $z_0$, then $f$ is continuous at $z_0$.
Choose the correct answer from the options given below:

Show Hint

An annulus $\{r_1 < |z| < r_2\}$ is the classic example of a region that is connected but NOT simply connected!
Updated On: Jul 29, 2026
  • A, B, E Only
  • A, D, E Only
  • B, C, E Only
  • A, C, D Only
Show Solution

The Correct Option is B

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