[r-t] Hudson stuff

[Richard Grimmett]

Thank you Mark and Richard for some very helpful explanations, and to
Ander for pointers on where to look.  I regret to say that even my
A'level Further Maths is so far back in the past that I have difficulty
now recognising any of the language.  I have come to realise that I have
developed my own way of expressing these things, and that it is not
helpful when needing to communicate with others!!!  Perhaps ist time for
me to learn.

Regards
Clarrie

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