Algebraic number theory-- Invariant theory-- P-adic numbers-- Quadratic forms-- Algebraic function 27 Invariants 22 Mathematics 9 Hilbert space 6 Invariant subspaces 6 Geometry, Algebraic 5 Image processing 5 Knot theory 5 Conformal invariants 4 Digital techniques 4 Moduli theory 4 Particles (Nuclear physics) 4 Signal processing 4 Geometry, Differential 3 Lecture Notes in Mathematics 3 Linear algebraic groups 3 Linear time invariant systems 3 MATHEMATICS / Topology 3 Mathematical physics 3 Quantum field theory 3 Quantum theory 3 System analysis 3 Topological and related algebra and groups 3 Adaptive filters 2 Banach spaces 2 Calculus 2 Calculus of variations 2 Causation 2 Class consciousness 2 Congresses 2