Analytic Functions

★★★★☆Undergraduate

📖Definition

An analytic (holomorphic) function is complex differentiable at every point in its domain. It's infinitely differentiable and expressible as Taylor series.

📐Formulas

f(z) = ∑_n=0^∈fty aₙ (z - z₀)ⁿ

Taylor series expansion

aₙ = \fracf^(n)(z₀)n! = (1)/(2π i)∮_C (f(z))/((z-z₀)^n+1)dz

Taylor coefficients

✏️Examples

예제 1

Find Taylor series of e^z at z₀ = 0.

예제 2

What is the series expansion of sin z?

Applications

Physics

Quantum mechanics, statistical mechanics

Engineering

Signal processing, control theory

Mathematics

Number theory, combinatorics

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Related

#해석함수#정칙함수#analytic#holomorphic