identity matrix
with each diagonal entry equal to 1 and all other entries equal to 0. It is the identity element for the set of n×n matrices with multiplication. See also Kronecker delta.
- apse
- Apéry's constant
- Arabic numeral
- arbitrarily large/small
- arbitrary
- arc
- arc
- arc-connected
- arccos
- arccosh
- Archimedean property
- Archimedean solid
- Archimedean spiral
- Archimedes
- Archimedes' constant
- Archimedes' method
- arc length
- are
- area
- area of a surface of revolution
- area under a curve
- arg
- Argand diagram
- Argand, Jean Robert
- argument