Symmetric Block Design
A symmetric design is a Block Design (
, 
, 
, 
, 
) with the same number of blocks as points, so 
(or, equivalently, 
). An example of a symmetric block design is a 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.
- Tribox
- Trichotomy Law
- Tricolorable
- Tricomi Function
- Tricuspoid
- Tricylinder
- Tridecagon
- Trident
- Trident of Descartes
- Trident of Newton
- Tridiagonal Matrix
- Tridiminished Icosahedron
- Tridiminished Rhombicosidodecahedron
- Tridyakis Icosahedron
- Trifolium
- Trigon
- Trigonal Dipyramid
- Trigonal Dodecahedron
- Trigonometric Functions
- Trigonometric Series
- Trigonometric Substitution
- Trigonometry
- Trigonometry Values--0
- Trigonometry Values Pi
- Trigonometry Values Pi/10