Update 11_nearly_free_electron_model_solutions.md - typo

src/11_nearly_free_electron_model_solutions.md → src/11_nearly_free_electron_model_solutions.md - typo

@@ -155,7 +155,7 @@ $$
 $$
 where $\langle n-1|n\rangle$ is the overlap between two neighbouring wavefunctions, given by
 $$
-$\langle n-1|n\rangle$ = 2\kappa\int_0^\infty e^{-\kappa|x-a/2|}e^{-\kappa|x+a/2|} = e^{-\kappa a}(1+\kappa a)
+\langle n-1|n\rangle$ = 2\kappa\int_0^\infty e^{-\kappa|x-a/2|}e^{-\kappa|x+a/2|} = e^{-\kappa a}(1+\kappa a)
 $$
 
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