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| | Combinatorial Theory (Site not responding. Last check: 2007-10-11) |
 | | A balanced incomplete block design D(b,v,k,r,l) is an arrangement of v distinct objects into b blocks such that each block contains exactly k distinct objects, each object occurs in exactly r different blocks, and every pair of distinct objects occurs in exactly l blocks. |
 | | Derived design and residual design block designs are based on symmetric designs but do not appear to be Perfect-N because they fail to satisfy the requirement that r = nk. |
 | | Design (26,13,3,6,1) may be generated from difference sets [1,3,9] and [2,5,6] mod 13 or from [1,2,5] and [1,3,8] mod 13. |
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