19Lxx 
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Topological $K$theory 

[See also 55N15, 55R50, 55S25] 
19L10 RiemannRoch theorems, Chern characters 19L20 $J$homomorphism, Adams operations [See also 55Q50] 19L41 Connective $K$theory, cobordism [See also 55N22] 19L47 Equivariant $K$theory [See also 55N91, 55P91, 55Q91, 55R91, 55S91] 19L64 Computations, geometric applications 19L99 None of the above, but in this section