K(G,n): π_n(K(G,n))=G, others 0. Represents singular-cohomology. Spectra = sequence (E_n) with structure-maps ΣE_n → E_{n+1}. Generalised cohomology theories (Brown representability).
K(G,n): π_n(K(G,n))=G, others 0. Represents singular-cohomology. Spectra = sequence (E_n) with structure-maps ΣE_n → E_{n+1}. Generalised cohomology theories (Brown representability).