Characteristic Class
Characteristic classes are Cohomology classes in the Base Space of a Vector Bundle, defined throughObstruction theory, which are (perhaps partial) obstructions to the existence of 
everywhere linearly independentvector Fields on the Vector Bundle. The most common examples of characteristic classes are theChern, Pontryagin, and Stiefel-Whitney Classes.
- Freemish Crate
- Free Semigroup
- Freeth's Nephroid
- Free Variable
- Freiman's Constant
- French Curve
- Frenet Formulas
- Frequency Curve
- Fresnel Integrals
- Fresnel's Elasticity Surface
- Fresnel's Wave Surface
- Frey Curve
- Frey Elliptic Curve
- Friday the Thirteenth
- Friend
- Friendly Giant Group
- Friendly Pair
- Frieze Pattern
- Frobenius-König Theorem
- Frobenius Map
- Frobenius Method
- Frobenius-Peron Equation
- Frobenius Pseudoprime
- Frobenius Theorem
- Frobenius Triangle Identities