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  2. Topological data analysis - Wikipedia

    en.wikipedia.org/wiki/Topological_data_analysis

    Combining tools from several branches of mathematics. Besides the obvious need for algebra and topology, partial differential equations, [ 143 ] algebraic geometry, [ 41 ] representation theory, [ 54 ] statistics, combinatorics, and Riemannian geometry [ 76 ] have all found use in TDA.

  3. Whitney extension theorem - Wikipedia

    en.wikipedia.org/wiki/Whitney_extension_theorem

    In mathematics, in particular in mathematical analysis, the Whitney extension theorem is a partial converse to Taylor's theorem.Roughly speaking, the theorem asserts that if A is a closed subset of a Euclidean space, then it is possible to extend a given function of A in such a way as to have prescribed derivatives at the points of A.

  4. Two-photon absorption - Wikipedia

    en.wikipedia.org/wiki/Two-photon_absorption

    Schematic of energy levels involved in two photons absorption. In atomic physics, two-photon absorption (TPA or 2PA), also called two-photon excitation or non-linear absorption, is the simultaneous absorption of two photons of identical or different frequencies in order to excite an atom or a molecule from one state (usually the ground state), via a virtual energy level, to a higher energy ...

  5. Line bundle - Wikipedia

    en.wikipedia.org/wiki/Line_bundle

    A global section of is a function : such that if : is the natural projection, then =. In a small neighborhood U {\displaystyle U} in X {\displaystyle X} in which L {\displaystyle L} is trivial, the total space of the line bundle is the product of U {\displaystyle U} and the underlying field k {\displaystyle k} , and the section s {\displaystyle ...

  6. All India Secondary School Examination - Wikipedia

    en.wikipedia.org/wiki/All_India_Secondary_School...

    All India Secondary School Examination, commonly known as the class 10th board exam, is a centralized public examination that students in schools affiliated with the Central Board of Secondary Education, primarily in India but also in other Indian-patterned schools affiliated to the CBSE across the world, taken at the end of class 10.

  7. Mathematics - Wikipedia

    en.wikipedia.org/wiki/Mathematics

    [124] [125] The Mathematics Subject Classification has a section for "general applied mathematics" but does not mention "pure mathematics". [14] However, these terms are still used in names of some university departments, such as at the Faculty of Mathematics at the University of Cambridge.

  8. List of unsolved problems in mathematics - Wikipedia

    en.wikipedia.org/wiki/List_of_unsolved_problems...

    Many mathematical problems have been stated but not yet solved. These problems come from many areas of mathematics, such as theoretical physics, computer science, algebra, analysis, combinatorics, algebraic, differential, discrete and Euclidean geometries, graph theory, group theory, model theory, number theory, set theory, Ramsey theory, dynamical systems, and partial differential equations.

  9. Discrete mathematics - Wikipedia

    en.wikipedia.org/wiki/Discrete_mathematics

    Discrete mathematics is the study of mathematical structures that can be considered "discrete" (in a way analogous to discrete variables, having a bijection with the set of natural numbers) rather than "continuous" (analogously to continuous functions). Objects studied in discrete mathematics include integers, graphs, and statements in logic.