(Entity["tangram", Entity["MathWorld","Tangram"], "Entity[\"MathWorld\", \"Tangram\"]", "MathWorld topic"])(Entity["illusion", Entity["MathWorld","Illusion"], "Entity[\"MathWorld\", \"Illusion\"]", "MathWorld topic"])(Entity["Peano curve", Entity["MathWorld","PeanoCurve"], "Entity[\"MathWorld\", \"PeanoCurve\"]", "MathWorld topic"])(Entity["Knuth number", Entity["MathWorld","KnuthNumber"], "Entity[\"MathWorld\", \"KnuthNumber\"]", "MathWorld topic"])(Entity["Balaban index", Entity["MathWorld","BalabanIndex"], "Entity[\"MathWorld\", \"BalabanIndex\"]", "MathWorld topic"])(Entity["domino tiling", Entity["MathWorld","DominoTiling"], "Entity[\"MathWorld\", \"DominoTiling\"]", "MathWorld topic"])(Entity["Lorentz group", Entity["MathWorld","LorentzGroup"], "Entity[\"MathWorld\", \"LorentzGroup\"]", "MathWorld topic"])(Entity["braced polygon", Entity["MathWorld","BracedPolygon"], "Entity[\"MathWorld\", \"BracedPolygon\"]", "MathWorld topic"])(Entity["Fourier series", Entity["MathWorld","FourierSeries"], "Entity[\"MathWorld\", \"FourierSeries\"]", "MathWorld topic"])(Entity["unitary matrix", Entity["MathWorld","UnitaryMatrix"], "Entity[\"MathWorld\", \"UnitaryMatrix\"]", "MathWorld topic"])…

(EntityClass["orthogonal polynomials", EntityClass["MathWorld","Calculus and Analysis:Special Functions:Orthogonal Polynomials"], "EntityClass[\"MathWorld\", \"Calculus and Analysis:Special Functions:Orthogonal Polynomials\"]", "MathWorld topics"])(EntityClass["abstract algebraic curves", EntityClass["MathWorld","Algebra:Algebraic Geometry:Abstract Algebraic Curves"], "EntityClass[\"MathWorld\", \"Algebra:Algebraic Geometry:Abstract Algebraic Curves\"]", "MathWorld topics"])(EntityClass["signal processing", EntityClass["MathWorld","Applied Mathematics:Signal Processing"], "EntityClass[\"MathWorld\", \"Applied Mathematics:Signal Processing\"]", "MathWorld topics"])(EntityClass["57-XX", EntityClass["MathWorld","57-XX"], "EntityClass[\"MathWorld\", \"57-XX\"]", "MathWorld topics"])(EntityClass["11Mxx", EntityClass["MathWorld","11Mxx"], "EntityClass[\"MathWorld\", \"11Mxx\"]", "MathWorld topics"])(EntityClass["15 a 36", EntityClass["MathWorld","15A36"], "EntityClass[\"MathWorld\", \"15A36\"]", "MathWorld topics"])(EntityClass["card games", EntityClass["MathWorld","Recreational Mathematics:Games:Card Games"], "EntityClass[\"MathWorld\", \"Recreational Mathematics:Games:Card Games\"]", "MathWorld topics"])(EntityClass["AP calculus BC", EntityClass["MathWorld","APCalculusBC"], "EntityClass[\"MathWorld\", \"APCalculusBC\"]", "MathWorld topics"])(EntityClass["California grade 6 standard", EntityClass["MathWorld","CaliforniaGrade6"], "EntityClass[\"MathWorld\", \"CaliforniaGrade6\"]", "MathWorld topics"])(EntityClass["estimators", EntityClass["MathWorld","Probability and Statistics:Estimators"], "EntityClass[\"MathWorld\", \"Probability and Statistics:Estimators\"]", "MathWorld topics"])…

(StringTypeLink["MathWorld", paclet:ref/entity/MathWorld]) entities include definitions and descriptions for more than 13000 mathematical terms.

(StringTypeLink["MathWorld", paclet:ref/entity/MathWorld]) entity classes correspond to a Mathematics Subject Classification, custom internal subject classification or educational standard.

Some properties are available for the (StringTypeLink["MathWorld", paclet:ref/entity/MathWorld]) entity type as a whole and can be given using the form (RefLink[EntityValue, paclet:ref/EntityValue])[(StringTypeLink["MathWorld", paclet:ref/entity/MathWorld]),property]. Such properties include:

The following annotations can be used in the third argument of (RefLink[EntityValue, paclet:ref/EntityValue])[(StringTypeLink["MathWorld", paclet:ref/entity/MathWorld]),property,annotation]:

The following annotations can be used in the second argument of (RefLink[EntityValue, paclet:ref/EntityValue])[property,annotation]:

A qualifier value of (RefLink[Automatic, paclet:ref/Automatic]) indicates that an applicable format of values can be used; e.g. for the "Date" qualifier, this includes a proper date or date span.

OpenersPrimaryExamplesSection(Spacer1)Examples  (4)

OpenersExampleSection0(Spacer1)Basic Examples  (4)

Use (Key1[ctrl, ==]) for entity discovery:

LinguisticAssistant

Find a property value for an entity:

(Entity["Fourier series", Entity["MathWorld","FourierSeries"], "Entity[\"MathWorld\", \"FourierSeries\"]", "MathWorld topic"])["AssociatedPeople"]

Retrieve a dataset of all available properties for an entity:

(Entity["domino tiling", Entity["MathWorld","DominoTiling"], "Entity[\"MathWorld\", \"DominoTiling\"]", "MathWorld topic"])["Dataset"]

Find MathWorld entities related to the Wolfram Language symbol "Root":

EntityClass["MathWorld","RelatedWolframLanguageSymbols"->(Entity["Root", Entity["WolframLanguageSymbol","Root"], "Entity[\"WolframLanguageSymbol\", \"Root\"]", "Wolfram Language symbol"])]//EntityList

({{DocumentationFooterIconsRelatedFunction.png, ({{See Also}, {Related Entity Types:  (RefLink[FamousMathProblem, paclet:ref/entity/FamousMathProblem])  ▪  (RefLink[FamousMathGame, paclet:ref/entity/FamousMathGame])}, {Related Interpreter Types:  (RefLink[MathWorld, paclet:ref/interpreter/MathWorld])  ▪  (RefLink[MathWorldClass, paclet:ref/interpreter/MathWorldClass])  ▪  (RefLink[ComputedMathWorld, paclet:ref/interpreter/ComputedMathWorld])}})}})

({{DocumentationFooterIconsRelatedGuide.png, ({{Related Guides}, {▪(RefLinkPlain[Entity Types, paclet:guide/EntityTypes])}})}})