Rational Function
A quotient of two polynomials 
and 
,
is called a rational function. More generally, if
and 
are Polynomials in multiple variables, their quotient is arational function.See also Abel's Curve Theorem, Closed Form, Fundamental Theorem of Symmetric Functions,Quotient-Difference Algorithm, Rational Integer, Rational Number, Riemann Curve Theorem- Denumerably Infinite
- de Polignac's Conjecture
- Depth (Graph)
- Depth (Size)
- Depth (Statistics)
- Depth (Tree)
- Derangement
- de Rham Cohomology
- Derivative
- Derivative Test
- Derived Set
- Dervish
- Desargues' Theorem
- Descartes Circle Theorem
- Descartes-Euler Polyhedral Formula
- Descartes Folium
- Descartes' Formula
- Descartes Ovals
- Descartes' Sign Rule
- Descartes Total Angular Defect
- Descriptive Set Theory
- Design
- Design Theory
- de Sluze Conchoid
- de Sluze Pearls