Mohsen Emami-Razavi - Plasma Physics Research Center, Science and Research Branch, Islamic Azad University, P.O. Box ۱۴۶۶۵-۶۷۸, Tehran, Iran

Some remarks about exotic systems consistingof various masses of fermions and antifermions have beenpresented. In paricular, few body systems containingelectrons, muons and tauons, and the fundamental interestof the study of their bound states systems have beendiscussed.

Exotic Systems Muons Tauons True Muonium Bound states