remove references to the book exercises

src/11_nearly_free_electron_model.md

@@ -8,7 +8,6 @@ pi = np.pi
 
 # Tight binding and nearly free electrons
 _(based on chapters 15–16 of the book)_  
-Exercises 15.1, 15.3, 15.4, 16.1, 16.2
 
 !!! summary "Learning goals"
 

src/12_band_structures_in_higher_dimensions.md

@@ -8,7 +8,6 @@ pi = np.pi
 
 # Tight binding and nearly free electrons
 _(based on chapters 15–16 of the book)_  
-Exercises 15.1, 15.3, 15.4, 16.1, 16.2
 
 !!! summary "Learning goals"
 

src/13_semiconductors.md

@@ -20,7 +20,6 @@ m_h, m_e = 1, .5
 
 # Semiconductor physics
 _(based on chapters 17–18 of the book)_  
-Exercises 17.1–17.4, 18.1, 18.2
 
 !!! summary "Learning goals"
 

src/5_atoms_and_lcao.md

@@ -12,7 +12,6 @@ pi = np.pi
 
 # Atoms and bonds
 _(based on chapters 5–8 of the book)_  
-Exercises 5.2, 6.2, 6.3, 6.4, 6.5
 
 !!! summary "Learning goals"
 

src/7_tight_binding.md

@@ -13,7 +13,6 @@ pi = np.pi
 
 # Electrons and phonons in 1D
 _(based on chapters 9–11 of the book)_  
-Exercises 9.2, 9.4, 10.1, 10.2, 11.2, 11.5
 
 !!! summary "Learning goals"
 

src/9_crystal_structure.md

 # Lecture 5 – Crystal structure and diffraction
 
 _based on chapters 12–14, (up to and including 14.2) of the book_  
-Exercises 12.3, 12.4, 13.3, 13.4, 14.2
 
 !!! summary "Learning goals"