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