It has been shown that there exists a (upsilon, 5, 1)-RBIBD for any positive integer upsilon = 5 (mod 20) with 147 possible exceptions. We show that such designs exist for 34 of these values.
机构:
SUZHOU INST SILK TEXT TECHNOL,MATH TEACHING RES SECT,SUZHOU 215005,PEOPLES R CHINASUZHOU INST SILK TEXT TECHNOL,MATH TEACHING RES SECT,SUZHOU 215005,PEOPLES R CHINA