Math Glossary, Math Terms, S
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- 7 Coins Puzzle
- Sam Loyd's Puzzles
- Saddle Point
- Salinon: From Archimedes' Book of Lemmas
- Salmon's points
- Sam Loyd's fifteen
- Sam Loyd's Geometric Puzzle
- Sam Loyd's Son's Dissection
- Sangaku
- SaRD Construction
- SAS
- Sawayama's Lemma
- Scalar
- Scalar product
- Scalene triangle
- Schlafli formula
- Schwarz Lantern
- Schweitzer's inequality
- Scintillating Grid Illusion
- Scoring
- Scoring Misère
- Scrub Tile Puzzle
- Sealed Bids Method
- Secant
- Secant Angles
- Second Napoleon Point
- Second Theorem of Apollonius
- Sector (in circle)
- See-Saw Lemma
- Segment (in circle)
- Self-conjugate triangle
- Self-descriptive Strings
- Self-documenting sentences
- Self-dual configuration
- Self-reference
- Semigroup
- Sending scouts into the desert
- Separating point sets with a circle
- Sequential Coalition
- Sequential compactness
- Sequential Rule
- Set
- Seven Circles Theorem
- Seven Terms Periodic Sequence
- Shaggy Dog Theorem
- Shape Property
- Shapes in a lattice
- Shapes of constant width
- Shapley-Shubik Index
- Shearing Transform
- Shepard's Parallelogram Illusion
- Shift
- Shimmer Illusion
- Ship-Dock Theorem
- Shoelace Formula
- Shredding the torus
- Shuttle Puzzle
- Sibling node
- Sierpinski Carpet
- Sierpinski gasket
- Sieve of Eratosthenes
- σ-Algebra
- Signature of a permuation
- Signed segment
- Signum function, sign(t)
- Silver Dollar Game
- Similar orderings
- Similar Triangles, theorem of
- Similarly ordered sequences
- Similarity
- Similarity dimension
- Simple continued fraction
- Simple graph
- Simple polygon
- Simple polyhedron
- Simplex
- Simson Line
- Simson-Wallace Theorem
- Simpson's paradox
- Simultaneous Contrast Illusion
- Simultaneous Contrast Illusion II
- Sine Law
- Single formula to express any integer with digits 0-9 each used just once
- Sitaru-Schweitzer Inequality
- Six Circles Theorem (Elkies)
- Six Circles Theorem (Evelyn)
- Skeleton of a polyhedron
- Skolem Sequence
- Slider Puzzles
- Sliders
- Slope
- Slope-Intercept Equation of a Straight Line
- Social Choice
- Soddy circles
- Soddy Line
- Soddy points
- Solitaire in the Circle
- Somos-4 Sequence
- Sophie Germain's Identity
- Soriteses
- Soroban
- Sorting Algorithms
- Spanning Tree
- Sperner's Labeling
- Sperner's Lemma
- Sperner's Theorem
- Sphere
- Spieker Center
- Spira Mirabilis
- Spiral Similarity
- Splitter
- Splitting piles
- Sprague-Grundy function
- Square
- Square numbers
- Squaring a circle
- Squaring Parabola
- Squares and Circles
- Squares, Circles, and Triangles
- Squeeze (Sandwich, Pinching ...) Theorem (Lemma)
- The Squeeze Theorem
- Squinting Eyes Theorem
- SSS
- Stability
- Staircase Illusion
- Star of David Theorems in Pascal Triangle
- Star Polygons
- Star-shaped region
- Stathis Koutras' Theorem
- Stationary point
- Steiner's Circumellipse in Barycentric Coordinates
- Steiner's Inellipse
- Steiner Porism
- Steiner's Circle
- Steiner's Curve
- Steiner's Ratio Theorem
- Steiner's Theorem
- Steiner's and Kirkman's Theorems
- Steinhaus' Problem
- Stereographic projection
- Stern-Brocot Tree
- Stern's diatomic series
- Stewart's theorem
- Straight angle
- Straight Edge Only Construction of Polar w.r.t. an Angle
- Straight Edge Only Construction of Polar w.r.t. a Circle
- Straight line
- Straight Tromino
- Strategy stealing in the game of Hex
- Stretching
- Strong induction
- Suan pan
- Subfactorial
- Subgraph
- Subgroup
- Subjective contour
- Subtraction Game
- Subtrahend
- Successor
- Sum Rule
- Sums and Products
- Superfactorial
- Supergraph
- Superposition Principle
- Supplementary angles
- Supporting lines of convex figures
- Surjective function
- Surreal numbers
- Syllogism, Modes Ponens
- Syllogism, more general
- Sylvester's Problem
- Symmedian
- Symmedian point
- Symmetric difference
- Symmetric group
- Symmetry Principle in Probability
- Symmetric relation
- Symmetry in circle
- Synthetic division
- System of Distinct Representatives
- Szilassi Polyhedron

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