Algebra Data processing 32 Congresses 25 Problems, exercises, etc 12 Error-correcting codes (Information theory) 8 Mathematics 7 Geometry 6 Mathematical analysis 6 Study and teaching (Secondary) 6 Computer algorithms 5 Functions 5 Algorithms 4 Graphic methods 4 Study and teaching 4 Logic, Symbolic and mathematical 3 Number theory 3 Programmed instruction 3 Trigonometry 3 APL (Computer program language) 2 Algebra, Boolean 2 Arithmetic 2 Computer software 2 Development 2 Early works to 1800 2 Equations, Theory of 2 Geometry, Projective 2 History 2 MACSYMA (Computer system) 2 Rewriting systems (Computer science) 2 Topology 2