- fibre of bundle
- fibre product of objects
- fibres of PBD closed set
- fibre space
- fibre sum of objects
- fibre type,typical fibre
- fictitious objective method
- f-ideal of a lattice-ordered ring
- f-ideal of a lattice-ordered ring
- fidelity criterion
- fiducial distribution
- field
- field
- field
- field and Galois theory
- field discriminant
- field equation
- field of a relation
- field of complex numbers
- field of direction of ordinary differential equation
- field of events
- field of formal power series
- field of fractions
- field of lines
- field of points