Triple-Free Set
A Set of Positive integers is called weakly triple-free if, for any integer 
, the Set 
. It is called strongly triple-free if 
Implies 
and 
. Define
where
denotes the Cardinality of 
, then
and
(Finch).See also Double-Free Set
References
Finch, S. ``Favorite Mathematical Constants.'' http://www.mathsoft.com/asolve/constant/triple/triple.html
- Flat Norm
- Flat Space Theorem
- Flat Surface
- Flattening
- Flemish Knot
- Fletcher Point
- Flexagon
- Flexatube
- Flexible Polyhedron
- Flip Bifurcation
- Floor Function
- Floquet Analysis
- Floquet's Theorem
- Flow
- Flower
- Flower of Life
- Flow Line
- Flowsnake
- Flowsnake Fractal
- Floyd's Algorithm
- Fluent
- Fluxion
- Flype
- Flyping Conjecture
- Focus