Algebraic number theory-- Invariant theory-- P-adic numbers-- Quadratic forms-- Algebraic function 27 Invariants 22 Invariant subspaces 6 Mathematics 6 Conformal invariants 4 Hilbert space 4 Knot theory 4 Moduli theory 4 Geometry, Algebraic 3 Linear algebraic groups 3 Linear time invariant systems 3 Signal processing 3 Congresses 2 Digital techniques 2 Form perception 2 Geometry, Differential 2 Image analysis 2 Image processing 2 Invariant measures 2 Lie groups 2 MATHEMATICS / Topology 2 Number theory 2 Quantum field theory 2 Shapes 2 System analysis 2 Three-dimensional imaging 2 Algebraic topology 1 Algebraic topology -- Classical topics -- Degree, winding number 1 Algebraic topology -- Homology and cohomology theories -- Other homology theories 1 Algorithms 1