fix typo in solution 10

src/10_xray_solutions.md

@@ -107,7 +107,7 @@ Note that $|k| = |k'| = k $ since elastic scatering
 reciprocal_lattice()
 # G vector
 plt.arrow(0,0,13.4*2,18.4,color='r',zorder=10,head_width=2,length_includes_head=True)
-plt.annotate('$\Delta \mathbf{G}$',(17,6.5),fontsize=14,ha='center',color='r')
+plt.annotate('$\mathbf{G}$',(17,6.5),fontsize=14,ha='center',color='r')
 # k vector
 plt.arrow(-6,37.4,6,-37.4,color='b',zorder=11,head_width=2,length_includes_head=True)
 plt.annotate('$\mathbf{k}$',(-8,18),fontsize=14, ha='center',color='b')
@@ -119,7 +119,9 @@ plt.show()
 ## Exercise 4: Structure factors
 
 ### Subquestion 1
-$S_\mathbf{G} = \sum_j f_j e^{i \mathbf{G} \cdot \mathbf{r_j}} = f(1 + e^{i \pi (h+k+l)}) =\\
+$S_\mathbf{G} = \sum_j f_j e^{i \mathbf{G} \cdot \mathbf{r_j}} = f(1 + e^{i \pi (h+k+l)}) =$
+
+$$
 \begin{cases}
       2f & \text{if $h+k+l$ is even}\\
       0 & \text{if $h+k+l$ is odd}