Generalized Arf invariants in algebraic L-theory
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The difference between the quadratic L-groups L.(A) and the sym- metric L-groups L*(A) of a ring with involution A is detected by generalized Arf invariants. The special case A = Z[x] gives a complete set of invariants for the Cappell UNil-groups UNil.(Z; Z, Z) for the infinite dihedral group D1 = Z2 * Z2, extending the results of Connolly and Ranicki , Connolly and Davis .