alias id "nat" = "cic:/Coq/Init/Datatypes/nat.ind#xpointer(1/1)".
alias num (instance 0) = "natural number".
-alias symbol "eq" (instance 0) = "leibnitz's equality".
+alias symbol "eq" (instance 0) = "leibnitz's equality".
alias symbol "plus" (instance 0) = "natural plus".
simplify.
reflexivity.
qed.
+
\ No newline at end of file