Columbia subject headings:
Algebra--History.
Combinatorial packing and covering.
Error-correcting codes (Information theory)
Finite simple groups.
Sphere.
Harvard subject headings:
Combinatorial packing and covering.
Error-correcting codes (Information theory)
Finite simple groups.
Group theory
Princeton subject headings:
Algebra--History.
Combinatorial packing and covering.
Error-correcting codes (Information theory)
Finite simple groups.
Sphere.