<正> 0 The Diophantine equation X~(2p)-Dy~2=1Let D be a positive integer which is square free,and p be a prime.In 1966,Ljunggren showed that if p=2 and D=q is a
<正> 1 IntroductionThe merits of TiB_2 ceramics:high hardness,high melting point,chemical stability athigh temperature,wear-resisting,corrosion-resisting and go