Update README.md

README.md

@@ -31,7 +31,7 @@ A tour in this context refers to a trajectory that visits all cities exactly onc
 
 In the context of the TSP, a cyclic permutation $\pi$ serves as a representation of a tour. If $\pi(j)$ is interpreted as the city following city j for j = 1, 2, ··· , n, the cost of the tour can be defined as follows:
 
-                                                $\sum_{j=1}^{n}d_{j\pi (j)}.$
+$\sum_{j=1}^{n}d_{j\pi (j)}$.
 
 __Matrix of cost__