Tan 
 proper noun
 An English surname derived from the transliteration of various Asian surnames, particularly originating from China and Vietnam.


tangent 
 noun
 (geometry) A straight line touching a curve at a single point without crossing it there.
 (trigonometry) In a right triangle, the ratio of the length of the side opposite the angle to the length of the side adjacent to the angle. Symbol: tan
<!This definition equivalent to the one above; it does not define a new sense of the word
 (mathematics) The ratio of the sine to the cosine, in either the real or complex numbers.>
 A topic nearly unrelated to the main topic, but having a point in common with it.
 I believe we went off onto a when we started talking about unicycles.
 A small metal blade by which a clavichord produces sound.
adjective
 (geometry) Touching a curve at a single point but not crossing it at that point.
 Of a topic, only loosely related to a main topic.

tensor 
 noun
 A muscle that stretches a part, or renders it tense.
 (algebra) the image of a tuple under a tensor product map
 (topology) a function of several variables which is a product of a number of functions of one variable, one for each variable, each of which is linear in that variable
 (physics) a matrix of matrices
verb
 To compute the tensor product of something with something else
adjective
 Of or relating to tensors

tenth 
 noun
 The person or thing in the tenth position.
 One of ten equal parts of a whole.
adjective
 The ordinal form of the number ten.

tesseract 
 noun (tesseract)
 (mathematics) The fourdimensional analogue/analog of a cube; a fourdimensional content (which see) bounded by eight cubes (in the same way as a cube is a volume bounded by six squares and a square is an area by four line segments).
 (figurative) A wrinkle in time that makes time travel possible. (Used by w:Madeleine L'Engle, Madeleine L'Engle in her sciencefiction novel, A Wrinkle in Time.)

tetragon 
 noun
 (context, geometry, rare) A quadrilateral.

tetragonal 
 adjective
 Having four sides (as a tetragon); quadrilateral.
 (crystallography) Having two equal axes and one unequal, and all angles 90Â°.

tetrahedral 
 adjective
 in the shape of a tetrahedron
 having four faces, four apices and six edges

tetrahedron 
 noun (pl2=tetrahedra)
 (geometry) a polyhedron with four faces; the regular tetrahedron, the faces of which are equal equilateral triangles, is one of the Platonic solids.

theorem 
 noun
 (mathematics) A mathematical statement of some importance that has been proven to be true. Minor theorems are often called propositions. Theorems which are not very interesting in themselves but are an essential part of a bigger theorem's proof are called lemmas
 (mathematics, colloquially, incorrectly) A mathematical statement that is expected to be true; as, w:Fermat's Last Theorem, Fermat's Last Theorem (as which it was known long before it was proved in the 1990s.)

theory 
 noun (theor, ies, )
 (countable) An unproven conjecture.
 I have a about who broke into the school last night, but I have no proof to back it up.
 (uncountable) An expectation of what should happen, barring unforeseen circumstances.
 So we"ll be there in three hours? " That"s the .
 (countable) (science) A coherent statement or set of statements that attempts to explain observed phenomenon, phenomena.
 There is now a welldeveloped of electrical charge.
 (countable) (science) A logical structure that enables one to deduce the possible results of every experiment that falls within its purview.
 The of relativity was proposed by Einstein.
 (uncountable) (mathematics) A field of study attempting to exhaustively describe a particular class of constructs.
 Knot classifies the mappings of a circle into 3space.
 (countable) (logic) A set of axioms together with all statements derivable from them.
 A is consistent if it has a model.

theory of games 
 noun
 (context, mathematics, economics) An older term for game theory.


thousandth 
 noun
 (plural thousandth ones) The person or thing in the thousandth position.
 One of a thousand equal parts of a whole.
adjective
 The ordinal form of the number thousand, one thousand.

tilde 
 noun
 (orthography): A diacritical mark placed above a letter to modify its pronunciation, such as by palatalization in Spanish words or nasalization in Portuguese words.
 A key found on some types of keyboards.
 A character resembling a curved hyphen (~). ASCII character 126. May represent approximation.

Times 
 proper noun  (newspapers) A common name (often in combination) for a newspaper or periodical, especially w:The Times, The Times (published in the United Kingdom), but also w:The New York Times, The New York Times, w:The Times of India, The Times of India, w:Radio Times, Radio Times, etc.

times sign 
 noun  (context, arithmetic, informal) A multiplication sign.

TO 
 abbreviation
 (informal) Toronto, a Canadian city. (Also T.O.)

transcendental function 
 noun  (mathematics) a function which does not satisfy a polynomial equation whose coefficients are themselves polynomials

transcendental number 
 noun  (mathematics) any irrational number that is not an algebraic number

transpose 
 noun
 (linearalg) The matrix formed by interchange, interchanging the rows and columns of another.
verb (transpos, ing)
 (transitive) To reverse or change the order of (two or more things); to swap or interchange.
 (transitive) (music) To rewrite or perform (a piece) in another key
 (transitive) (algebra) To move (a term) from one side of an algebraic equation to the other, reverse, reversing the sign of the term.

triangle inequality 
 noun the triangle inequality (uncountable)
 (analysis) The inequality that states that the magnitude of the sum of two vectors is less than or equal to the sum of the magnitudes of the vectors, or any equivalent inequality in other spaces.


truncated 
 verb
 (past of, truncate)
<!this belongs on the page for "truncate"

Turing machine 
 noun
 (comptheory) An abstract computing machine introduced in 1936 by Alan Turing to give a mathematically precise definition of computability.
