- inferior angle
- inferior conjugate angle
- inferior limit of a set sequence
- inferior relation
- infiltrated face problem
- infimum
- infimum
- infimum
- infimum convolution
- infimum of a set family
- infinitary combinatorics
- infinitary operation
- infinite
- infinite
- infinite Abelian group
- infinite axiom
- infinite Boolean algebra
- infinite cardinal number
- infinite codimension
- infinite commutative group
- infinite continued fraction
- infinite countable sets
- infinite cyclic group
- infinite decimal
- infinite determinacy of map-germs