deletions | additions       diff --git a/Sternheimer.tex b/Sternheimer.tex  index 3439d2e..d4d7ca5 100644  --- a/Sternheimer.tex  +++ b/Sternheimer.tex 
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self-consistent equations for linear response that only depend on the  occupied ground-state orbitals.  Parts to add: k.p, vibrations, minimal projector P_n, \(P_n\),  electric fields in periodic systems, Born charges, tensor symmetrization with k-point symmetries