Pat and Pat, (01)
I think that this discussion has converged on something useful,
for which there is already well established terminology. But
the word 'primitive' is not one of the terms. (02)
PC> Those various temporal theories can all be expressed in terms
> of three concepts: time-point, time-interval and duration. (03)
PH> but they also use various different relations, such as the timepoint
> and subinterval orderings and the various relations between points and
> intervals. (04)
All these relations can be expressed with the real number system
together with units of measurement, such as 'second' and 'meter'.
The relations among the numbers lead us to other useful terms, such
as 'multiply' and 'divide', which can be combined with 'meter' and
'second' to give us 'meter per second' and 'meter per second per
second'. (05)
Any foundational ontology suitable for science and engineering must
include all those units of measurement, plus many others, such as
ampere, volt, ohm, coulomb, joule, etc. (06)
If you want to talk about financial systems, there will be units
such as dollars, euros, yen, etc. (07)
In any case, there is no question that all these terms belong
in any foundation ontology, but the term 'unit of measurement'
is better than 'primitive'. (08)
And the number of theories that relate those units is vastly
greater than the number of units. (09)
John (010)
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