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Correspondence

Contact

Email is best and is read properly. I answer most messages, and I answer specific ones faster than general ones. Write to me about potential collaborations in particular: they are the reason this page exists.

What to write about

Correspondence about the writing
Disagreement is welcome, particularly the specific kind. If you think an argument here is wrong, the most useful message says which claim and why.
Corrections
Errors of fact are fixed in place, dated and noted in the text. Send the claim, the correction and a source, and it will be dealt with quickly.
Permissions
Requests to reproduce, translate or teach from any piece. Permission for teaching and non-commercial use is given readily.
Collaborations
Write to me about potential collaborations. I am interested in working with people on software, on research, and on anything at the point where the two meet, and I would rather hear a half formed idea early than a finished one too late.
The ventures
Enquiries about VRhino, CourtDesk or BoatXchange, including partnerships and distribution.

Elsewhere

Before writing about reuse, it may save time to read the copyright policy, which grants most of what people usually ask for. The disclaimer answers the question of whose views these are.