Fundamental System
A set of Algebraic Invariants for a Quantic such that any invariant of the Quanticis expressible as a Polynomial in members of the set. In 1868, Gordan proved the existence of finite fundamental systemsof algebraic invariants and covariants for any binary Hilbert 
(1890) proved theHilbert Basis Theorem, which is a finiteness theorem for the related concept of Syzygies.
References
Hilbert, D. ``Über die Theorie der algebraischen Formen.'' Math. Ann. 36, 473-534, 1890.
- Diamond
- Dice
- Dichroic Polynomial
- Dido's Problem
- Diesis
- Diffeomorphism
- Difference
- Difference Equation
- Trigonometry Values Pi/4
- Trigonometry Values Pi/5
- Trigonometry Values Pi/6
- Trigonometry Values Pi/7
- Trigonometry Values Pi/8
- Trigonometry Values Pi/9
- Trigyrate Rhombicosidodecahedron
- Trihedron
- Trilinear Coordinates
- Trilinear Line
- Trilinear Polar
- Trillion
- Trimagic Square
- Trimean
- Trimorphic Number
- Trinoid
- Trinomial