Cofactor
The signed version 
of a Minor 
of a Matrix
used in the computation of the matrix's Determinant
See also Determinant Expansion by Minors, Minor
- Achilles and the Tortoise Paradox
- Ackermann Function
- Ackermann Number
- Acnode
- Acoptic Polyhedron
- Action
- Acute Angle
- Acute Triangle
- Adams-Bashforth-Moulton Method
- Adams' Method
- Addend
- Addition
- Addition Chain
- Addition-Multiplication Magic Square
- Additive Persistence
- Adem Relations
- Adequate Knot
- Adiabatic Invariant
- Adjacency Matrix
- Adjacency Relation
- Adjacent Fraction
- Adjacent Value
- Adjacent Vertices
- Adjoint Curve
- Adjoint Matrix