Definition:Block (Block Design)

Definition

Let $X$ be a set of points.

Let $\BB$ be a multiset of subsets of $X$.

Then the elements of $\BB$ are called blocks.

Sources

• 1998: David Nelson: The Penguin Dictionary of Mathematics (2nd ed.) ... (previous) ... (next): block: 1.
• 2008: David Nelson: The Penguin Dictionary of Mathematics (4th ed.) ... (previous) ... (next): block: 1.