20Gxx Linear algebraic groups (classical groups),

{For arithmetic theory, see 11E57, 11H06; for geometric theory, See 14Lxx, 22Exx; for other methods in representation theory, See {15AQ30, 22Exx} {15A30, 22E45, 22E46, 22E47, 22E50, 22E55}} --> Top level of Index
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