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Descent equations play an important role in the theory of characteristic classes and find applications in theoretical physics, e.g., in the Chern–Simons field theory and in the theory of anomalies. The second Chern class (the first Pontrjagin class) is defined as $$p= \langle F, F\rangle $$ p=⟨F,F⟩ where F is the curvature 2-form and $$\langle \cdot , \cdot \rangle $$ ⟨·,·⟩ is an invariant scalar...
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