Hilbert Matrix
A Matrix 
with elements
for
, 2, ..., 
. Although the Matrix Inverse is given analytically by
Hilbert matrices are difficult to invert numerically. The Determinants for the first few values of
are given in the following table. | det() |
| 1 | 1 |
| 2 |  |
| 3 |  |
| 4 |  |
| 5 |  |
| 6 |  |
- Triomino
- Triple
- Triple-Free Set
- Triple Jacobi Product
- Triple Point
- Triple Scalar Product
- Triplet
- Trip-Let
- Triple Vector Product
- Triplicate-Ratio Circle
- Trisected Perimeter Point
- Trisection
- Trisectrix
- Trisectrix of Catalan
- Trisectrix of Maclaurin
- Triskaidecagon
- Triskaidekaphobia
- Tritangent
- Tritangent Triangle
- Trivial
- Trivialization
- Trochoid
- Tromino
- True
- Truncate