Algebraic Topology: Homotopy and Homology
《Algebraic Topology: Homotopy and Homology》 · 第 391—392 页 · Section 16
The natural composite from \(K^*(X)\) to even and odd rational cohomology is denoted by \(\operatorname{ch}\) and called the Chern character; it is a ring homomorphism for every space \(X\).