Injective
A Map is injective when it is One-to-One, i.e., 
is injective when 
Implies 
.
- Quadratic Invariant
- Quadratic Irrational Number
- Quadratic Map
- Quadratic Mean
- Quadratic Reciprocity Law
- Quadratic Reciprocity Relations
- Quadratic Reciprocity Theorem
- Quadratic Recurrence
- Quadratic Residue
- Quadratic Sieve Factorization Method
- Quadratic Surd
- Quadratic Surface
- Quadratrix of Hippias
- Quadrature
- Quadrature Formulas
- Quadric
- Quadricorn
- Quadrifolium
- Quadrilateral
- Quadrillion
- Quadriplanar Coordinates
- Quadruple
- Quadruple Point
- Quadruplet
- Quadtree