Conference – 1990 Equation

r=iπ r n = i n π MathType@MTEF@5@5@+= feaagKart1ev2aaatCvAUfeBSjuyZL2yd9gzLbvyNv2CaerbuLwBLn hiov2DGi1BTfMBaeXatLxBI9gBaerbd9wDYLwzYbItLDharqqtubsr 4rNCHbGeaGqiVu0Je9sqqrpepC0xbbL8F4rqqrFfpeea0xe9Lq=Jc9 vqaqpepm0xbba9pwe9Q8fs0=yqaqpepae9pg0FirpepeKkFr0xfr=x fr=xb9adbaqaaeGaciGaaiaabeqaamaabaabaaGceaqabeaacaqGYb Gaeyypa0JaaeyAaiabgkHiTiabec8aWbqaaiaabkhadaWgaaWcbaGa aeOBaaqabaGccqGH9aqpcaqGPbWaaSbaaSqaaiaab6gaaeqaaOGaey OeI0IaeqiWdahaaaa@436D@