Usually means: Algebraic study of topological spaces.
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We found 9 dictionaries that define the word cohomology:

General (5 matching dictionaries)
  1. cohomology: Merriam-Webster
  2. cohomology: Collins English Dictionary
  3. cohomology: Wordnik
  4. cohomology: Wiktionary
  5. Cohomology: Wikipedia, the Free Encyclopedia

Computing (1 matching dictionary)
  1. Cohomology: Encyclopedia

Science (3 matching dictionaries)
  1. Cohomology: Eric Weisstein's World of Mathematics
  2. Cohomology: Extragalactic Astronomy
  3. cohomology, cohomology: PlanetMath Encyclopedia

(Note: See cohomological as well.)

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Definitions from Wiktionary (cohomology)

▸ noun:  (mathematics) A method of contravariantly associating a family of invariant quotient groups to each algebraic or geometric object of a category, including categories of geometric and algebraic objects.
▸ noun:  (mathematics) A system of quotient groups associated to a topological space.

Similar:
hypercohomology, homology, hyperhomology, homological algebra, homology group, homotopy theory, pseudocycle, coinvariant, homotopy, covariant, more...

Opposite:
homology, de Rham cohomology, singular cohomology

Types:
de Rham cohomology, singular cohomology, Čech cohomology, sheaf cohomology, Eilenberg–Ste, more...

Phrases:
cohomology class, cohomology group, cohomology theory, Sheaf cohomology, Galois cohomology, more...

Adjectives:
local, cyclic, quantum, equivariant, infinite, rational, ordinary, first, adic, relative, integral

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Similar:
hypercohomology, homology, hyperhomology, homological algebra, homology group, homotopy theory, pseudocycle, coinvariant, homotopy, covariant, more...

Opposite:
homology, de Rham cohomology, singular cohomology

Types:
de Rham cohomology, singular cohomology, Čech cohomology, sheaf cohomology, Eilenberg–Ste, more...

Phrases:
cohomology class, cohomology group, cohomology theory, Sheaf cohomology, Galois cohomology, De Rham cohomology, Group cohomology, Equivariant cohomology, Motivic cohomology, Cohomology ring, more...

Adjectives:
local, cyclic, quantum, equivariant, infinite, rational, ordinary, first, adic, relative, integral



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