1 set "baseuri" "cic:/matita/tests/drop".
3 alias id "O" = "cic:/Coq/Init/Datatypes/nat.ind#xpointer(1/1/1)".
4 alias num (instance 0) = "natural number".
5 alias symbol "eq" (instance 0) = "leibnitz's equality".
6 alias symbol "plus" (instance 0) = "natural plus".