Computer algebra and the study of unconventional electron lenses.
The calculation of aberration coefficients, and even the derivation of paraxial equations, can involve an immense volume of elementary algebraic manipulation; the use of a computer to lighten this task for some unconventional electron lens types is described.
D003201:Computers; D007909:Lenses; D008854:Microscopy, Electron / Q000295:instrumentation*