define statement of rule mp as system s infer all metavar var a end metavar indeed all metavar var b end metavar indeed metavar var a end metavar imply metavar var b end metavar infer metavar var a end metavar infer metavar var b end metavar end define
define proof of rule mp as rule tactic end define
The pyk compiler, version 0.grue.20060417+ by Klaus Grue,