Sigma Algebra
Let 
be a Set. Then a 
-algebra 
is a nonempty collection of Subsets of such thatthe following hold:
- 1. The Empty Set is in .
- 2. If
is in , then so is the complement of . - 3. If
is a Sequence of elements of , then the Union of the s is in .
If 
is any collection of subsets of , then we can always find a -algebra containing , namely thePower Set of . By taking the Intersection of all -algebras containing , we obtain the smallestsuch -algebra. We call the smallest -algebra containing the -algebra generated by .
- Triaugmented Hexagonal Prism
- Triaugmented Triangular Prism
- Triaugmented Truncated Dodecahedron
- Triaxial Ellipsoid
- Tribar
- Tribonacci Number
- 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