Section GeneralMonotonicity.
Variable gf: rel -> rel.

Lemma gupaco4_mon_gen (gf' clo clo': rel -> rel) x0 x1 x2 x3 r r'
(IN: @gupaco4 gf clo r x0 x1 x2 x3)
(gf_mon: monotone4 gf)
(LEgf: gf <5= gf')
(LEclo: clo <5= clo')
(LEr: r <4= r'):
@gupaco4 gf' clo' r' x0 x1 x2 x3.