Chern Forms and Homotopy Groups
How can we construct closed p-forms from the matrix θ2 of curvature forms?
22.1. Chern Forms and Winding Numbers
22.1a. The Yang–Mills “Winding Number”
the gauge group being assumed SU (n).
We saw in (21.14) that the Cartan 3-form on SU (n)
is a nontrivial ...