diff --git a/Concurrent Systems/notes/13 - CCS cose varie.md b/Concurrent Systems/notes/13 - CCS cose varie.md
index bddaeac..6685529 100644
--- a/Concurrent Systems/notes/13 - CCS cose varie.md	
+++ b/Concurrent Systems/notes/13 - CCS cose varie.md	
@@ -37,7 +37,7 @@ NO: the problem is that, for example:
 - BUT (P,P) in general does NOT belong to S!
 
 So we can try with $$S = \{ (α.P+α.P+M , α.P+M) \} ∪ \{(P,P)\}$$
-But it is not yet a bisimulation. 
+But it is not yet a bisimulation.
 P –β–> P’ (challenge and reply), but we don't have (P', P') in S.
 
 So let's try with: $$S = \{ (α.P+α.P+M , α.P+M) \} ∪ Id$$