Hilbert space 5 Mathematical analysis 5 Algebra 3 Convex domains 3 Homology theory 3 Invariant subspaces 3 Algebraic fields 2 Diophantine analysis 2 Dirichlet principle 2 Dirichlet-Raum 2 Fractals 2 Functions, Zeta 2 Geometric group theory 2 Holomorphic functions 2 Mathematics 2 Trees (Graph theory) 2 Abelian groups 1 Algebraic logic 1 Algebraic spaces 1 Algebras, Linear 1 Algorithms 1 Approximation theory 1 Banach spaces 1 Categories (Mathematics) 1 Chemistry, Physical and theoretical 1 Combinatorial analysis 1 Curves, Algebraic 1 Distribution modulo one 1 Eigenvalues 1 Eigenvectors 1