Latex for lattices

[Howard Anthony Gregory]

Dear colleagues,

I would like to ask if there are any Latex macros for type inheritance
"lattices".

Many thanks,
Howard Gregory

___________________________

H. A. O. Gregory
Seminar für Englische Philologie
Georg-August-Universität Göttingen
Käte-Hamburger-Weg 3
37073 Göttingen
Deutschland

E-mail: howard.gregory at phil.uni-goettingen.de
Web:    http://babe.engl.phil.uni-goettingen.de