Fisher's inequality

Fisher's inequality

[¦fish·ərz ‚in·i′kwäl·əd·ē]
(mathematics)
The inequality whereby the number b of blocks in a balanced incomplete block design is equal to or greater than the number v of elements arranged among the blocks.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.