Supported by the Natural Science Foundation of Hebei Province(A2013408009); Sup- ported by the Specialized Research Fund for the Doctoral Program of Higher Education(20121303110005); Supported by the Natural Science Foundation of Hebei Education Department(ZH2012082); Supported by the Foundation of Langfang Teachers University(LSBS201205)
The concept of relative t-designs for Q-polynomial association schemes is due to Delsarte(Philips Res Rep 32: 373C411, 1997). In this paper, we discuss the Fisher type lower bounds of tight relative 6-designs very exp...