e^{j\omega _o n} \Leftrightarrow 2\pi \sum\limits_{k = - \infty }^\infty {\delta (\omega - \omega _o + 2\pi k)}
% MathType!MTEF!2!1!+- % feaafaart1ev1aaatCvAUfeBSjuyZL2yd9gzLbvyNv2CaerbuLwBLn % hiov2DGi1BTfMBaeXatLxBI9gBaerbd9wDYLwzYbItLDharqqtubsr % 4rNCHbGeaGqiVCI8FfYJH8YrFfeuY-Hhbbf9v8qqaqFr0xc9pk0xbb % a9q8WqFfeaY-biLkVcLq-JHqpepeea0-as0Fb9pgeaYRXxe9vr0-vr % 0-vqpWqaaeaabiGaciaacaqabeaadaqaaqaaaOqaaiaadwgadaahaa % WcbeqaaiaadQgacqaHjpWDdaWgaaadbaGaam4BaaqabaWccaWGUbaa % aOGaeyi1HSTaaGOmaiabec8aWnaaqahabaGaeqiTdqMaaiikaiabeM % 8a3jabgkHiTiabeM8a3naaBaaaleaacaWGVbaabeaakiabgUcaRiaa % ikdacqaHapaCcaWGRbGaaiykaaWcbaGaam4Aaiabg2da9iabgkHiTi % abg6HiLcqaaiabg6HiLcqdcqGHris5aaaa!55B2!
Pasting the above "text" into MathType 5.0 will enter the above equation and make it possible to edit, save, and use in applications such as MS Word.
