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Let (M,g) be a spin manifold with Dirac operator D, I define for a fixed vector field X, a proper spinor for the proper value λ as :
Dψλ=λ(X.ψλ)
Have we an orthonormal basis for the products <ψ,ψ′> and <X.ψ,ψ′> of such proper spinors?
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