The representation of a function f(x), which is periodic in x, as an infinite series of sine and cosine functions,
a0 = ∫π-π f(x)dx, an = ∫π-πf(x) cosnxdx, (n = 1,2,3,…), bn = 1/π ∫π-π f(x) sinxdx, (n = 1,2,3,…).
Fourier analysis and Fourier series are named after the French mathematician and engineer Joseph Fourier (1768–1830). Fourier series have many important applications in mathematics, science, and engineering, having been invented by Fourier in the first quarter of the 19th century in his analysis of the problem of heat conduction- Kovar
- Kramers theorem
- Kundt's tube
- L-D process
- l-form
- labelling
- laevorotatory
- lag
- Lagrangian
- Lamb shift
- lambda particle
- lambda point
- lambert
- Lambert's laws
- laminar flow
- laminated core
- Landau damping
- Landau ghost
- Landé interval rule
- Langevin equation
- Langmuir frequency
- Laplace equation
- Larmor precession
- laser
- laser printer