-alias symbol "and" (instance 0) = "logical and".
-alias symbol "eq" (instance 0) = "leibnitz's equality".
-alias symbol "exists" (instance 0) = "exists".
+alias symbol "and" (instance 0) = "Coq's logical and".
+alias symbol "eq" (instance 0) = "Coq's leibnitz's equality".
+alias symbol "exists" (instance 0) = "Coq's exists".