theorem Th18:
ex
f1,
f2 being
morphism of
(OrdC 3) st
( not
f1 is
identity & not
f2 is
identity &
cod f1 = dom f2 &
Ob (OrdC 3) = {(dom f1),(cod f1),(cod f2)} &
Mor (OrdC 3) = {(dom f1),(cod f1),(cod f2),f1,f2,(f2 (*) f1)} &
dom f1,
cod f1,
cod f2,
f1,
f2,
f2 (*) f1 are_mutually_distinct )