Homology and cohomology theories 20 Homology theory 11 Algebra 6 Algebra, Homological 3 Group theory 3 Sheaf theory 3 Cohomology 2 Cohomology operations 2 Field theory 2 Geometry, Differential 2 Lecture Notes in Mathematics 2 Tata Institute of Fundamental Research 2 Algebraic spaces 1 Algebraic topology 1 Algebraic topology -- Classical topics -- Degree, winding number 1 Algebraic topology -- Homology and cohomology theories -- Other homology theories 1 Annals of Mathematics Studies 1 Calculus of tensors 1 Coding and Information Theory 1 Coding theory 1 Cohomology Theory 1 Commutative algebra 1 Cryptology 1 Curves, Elliptic 1 Data Structures 1 Data encryption (Computer science) 1 Data structures (Computer science) 1 Differential -- Integral geometry-- Mathematics 1 Differential Forms 1 Differential Geometry 1