stationary point
. The term is also used for the number c such that 
. The corresponding value f(c) is a stationary value.
(i) If f ′(x)>0 to the left of c and f ′(x)<0 to the right of c, then c is a local maximum;
(ii) if f ′(x) < 0 to the left of c and f ′(x) > 0 to the right of c, then c is a local minimum;
(iii) f ′(x) has the same sign to the left and to the right of c, then c is a point of inflexion.
- quota sample
- quotient
- quotient group
- quotient ring
- quotient rule
- quotient space
- R
- Rademacher's Theorem
- radial and transverse components
- radial set
- radian
- radical
- radical axis
- radical sign
- radicand
- radius
- radius
- radius of convergence
- radius of curvature
- radius of gyration
- radius vector
- raise
- Ramanujan, Srinivasa
- Ramsey, Frank
- Ramsey Theory