- fixed sphere
- fixed step size
- fixed subgroup
- fixed system
- fixed time incrementing method
- fixed ultrafilter
- fixed value
- fixed vector
- fixed width
- fixing
- FK-space
- flabbiness
- flabby
- flabby category
- flabby resolution
- flabby sheaf
- flag
- flag-affine
- flag bit
- flag bundle
- flag complex
- flag curvature
- flag manifold
- flag set
- flag space