Quadratic Reciprocity Relations
 |  |  | (1) |
 | |  | (2) |
 | |  | (3) |
where
is the Legendre Symbol.See also Quadratic Reciprocity Theorem- Skewness
- Skew Polyomino
- Skew Quadrilateral
- Skew Symmetric Matrix
- Sklar's Theorem
- Skolem-Mahler-Lerch Theorem
- Skolem Paradox
- Skolem Sequence
- Slant Height
- Slice Knot
- Slide Move
- Slide Rule
- Slightly Defective Number
- Slightly Excessive Number
- Slip Knot
- Slope
- Slothouber-Graatsma Puzzle
- Slutzky-Yule Effect
- Sluze Pearls
- Smale-Hirsch Theorem
- Smale Horseshoe Map
- Small Cubicuboctahedron
- Small Ditrigonal Dodecacronic Hexecontahedron
- Small Ditrigonal Dodecicosidodecahedron
- Small Ditrigonal Icosidodecahedron