Face
The intersection of an 
-D Polytope with a tangent Hyperplane. 0-D faces are known as Vertices (nodes), 1-D faces as Edges, 
-D faces as Ridges, and 
-Dfaces as Facets.
- Favard Constants
- F-Distribution
- Feigenbaum Constant
- Feigenbaum Function
- Feit-Thompson Conjecture
- Feit-Thompson Theorem
- Fejes Tóth's Integral
- Fejes Tóth's Problem
- Feller-Lévy Condition
- Feller's Coin-Tossing Constants
- Fence
- Fence Poset
- Ferguson-Forcade Algorithm
- Fermat 4n+1 Theorem
- Fermat Compositeness Test
- Fermat Conic
- Fermat Difference Equation
- Fermat Diophantine Equation
- Fermat Equation
- Fermat-Euler Theorem
- Fermatian
- Fermat-Lucas Number
- Fermat Number
- Fermat Number (Lucas)
- Fermat Point