Cramér's Theorem
If 
and 
are Independent variates and 
is a Gaussian Distribution,then both and must have Gaussian Distributions. This was proved by Cramér in1936.
- Isoperimetric Problem
- Isoperimetric Quotient
- Isoperimetric Theorem
- Isopleth
- Isoptic Curve
- Isosceles Tetrahedron
- Isosceles Triangle
- Isoscelizer
- Isospectral Manifolds
- Isothermal Parameterization
- Isotomic Conjugate Point
- Isotomic Lines
- Isotone Map
- Isotope
- Isotopy
- Isotropic Tensor
- Isovolume Problem
- Isthmus
- Iterated Exponential Constants
- Iterated Function System
- Iterated Radical
- Iteration Sequence
- Itô's Lemma
- Itô's Theorem
- Iverson Bracket