Section GeneralMonotonicity.
Variable gf: rel -> rel.

Lemma gupaco2_mon_gen (gf' clo clo': rel -> rel) x0 x1 r r'
(IN: @gupaco2 gf clo r x0 x1)
(gf_mon: monotone2 gf)
(LEgf: gf <3= gf')
(LEclo: clo <3= clo')
(LEr: r <2= r'):
@gupaco2 gf' clo' r' x0 x1.