Updated latex error

src/1_einstein_model_solutions.md

@@ -75,7 +75,6 @@ The heat capacity is temperature independent.
 1. $$
 Z = \sum_{n = 0}^{\infty} e^{-\beta\hbar\omega(n + 1/2)} = e^{-\beta\hbar\omega/2}\frac{1}{1 - e^{-\beta\hbar\omega}} = \frac{1}{2\sinh(\beta\hbar\omega/2)},
 $$
-
 where we used $\sum_{n = 0}^{\infty}r^n = \frac{1}{1 - r}$.
 
 2. $$