Symmetric Block Design

A symmetric design is a Block Design ($v$, $k$, $\lambda$, $r$, $b$) with the same number of blocks as points, so $b=v$ (or, equivalently, $r=k$). An example of a symmetric block design is a Projective Plane.

See also Block Design, Projective Plane

References

Dinitz, J. H. and Stinson, D. R. ``A Brief Introduction to Design Theory.'' Ch. 1 in Contemporary Design Theory: A Collection of Surveys (Ed. J. H. Dinitz and D. R. Stinson). New York: Wiley, pp. 1-12, 1992.