Update README.md

davide-f · Apr 19, 2021 · 3692c95 · 3692c95
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@@ -8,7 +8,7 @@ Improved version of Multiple Objective Particle Swarm Optimization (MOPSO), that
 5. presents a more user-friendly method to set options is also included, and
 6. supports vectorized functions.
 
-Two advanced convergence criteria are based on:
+The two advanced convergence criteria are based on:
 1. the spread measure and 
 2. quadratic mean of the crouding distances, which enhance the standard criterion based on maximum number of iterations.