Search 7,000+ topics

Extension: What Is Complex Analysis?

Read this topic

Explanations 1

If you'd notice, everything covered about power series covered previously concerns real polynomials and real values. When we wrote a series, it was as an infinite polynomial wit…
By Wayne Zhao

Problems 1

What's the radius of convergence of cos⁡(z)=1−z22!+z44!−⋯\cos(z) = 1 - \frac{z^2}{2!} + \frac{z^4}{4!} - \cdotscos(z)=1−2!z2+4!z4−⋯? Note zzz is complex.