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Encyclopedia of Delay-Insensitive Systems (EDIS)

Frequently Asked Questions

Why is EDIS restricted to delay-insensitive (DI) systems?
The field of DI systems is already quite extended. Covering just that will provide enough work to keep us busy for a while. Besides, it is the field where we have the most experience. In the future, it may be possible to extend EDIS to incorporate other fields as well.

How can I stay informed about EDIS without visiting it every so often?
Announcements concerning EDIS, in particular major changes in EDIS, will be distributed on the EDIS Mailing List.

How can I contribute to EDIS?
Currently there is no way to add pages to EDIS remotely. We are open to suggestions. If you prepare a page in the vein of the other pages, it should be relatively easy for me to incorporate it into EDIS. Also see EDIS Internal Naming and Structuring Conventions.

What is the origin of the EDIS logo? What does it signify?
The EDIS logo first appeared on the front cover of Tom Verhoeff's dissertation [Verhoeff94]. His father, Koos Verhoeff, designed it, inspired by the state graph of a Forked Join, which expresses the composite behavior of a Join whose output is connected to the input of a Fork. This state graph has 10 states and 16 arrows. The initial state is in the center, and the rightmost vertex represents the same state as the leftmost vertex. The arrows corresponding to the inputs of the Join lie in parallel vertical planes, the arrows for the outputs of the Fork lie in horizontal planes. The flow of behavior is from left to right.

The object enjoys the 24 symmetries of the group S4, which is also the symmetry group of the tetrahedron. The beams have a triangular cross section.

[Mathematica program for EDIS logo]

Last modified at Mon Oct 26 15:49:03 1998
Encyclopedia of Delay-Insensitive Systems
Copyright © 1995-1998 Tom Verhoeff / Tom.Verhoeff@acm.org