Unit
A unit is an element in a Ring that has a multiplicative inverse. If 
is an Algebraic Integer whichdivides every Algebraic Integer in the Field, is called a unit in that Field. A givenField may contain an infinity of units. The units of 
are the elements Relatively Primeto . The units in which are Squares are called QuadraticResidues.
- Fourier Transform--Exponential Function
- Fourier Transform--Gaussian
- Fourier Transform--Heaviside Step Function
- Fourier Transform Inverse Function
- Fourier Transform--Lorentzian Function
- Fourier Transform--Ramp Function
- Fourier Transform--Rectangle Function
- Fourier Transform--Sine
- Four Travelers Problem
- Four-Vector
- Four-Vertex Theorem
- Fox's H-Function
- F-Polynomial
- Frac
- Fractal
- Fractal Dimension
- Fractal Land
- Fractal Process
- Fractal Sequence
- Fractal Valley
- Fraction
- Fractional Calculus
- Fractional Derivative
- Fractional Differential Equation
- Fractional Fourier Transform