[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]
Re: [tlaplus] Re: Type checking and custom infinite sets
Hi!
Thanks for the reply. The
specific set I want to define is inductively defined/constructed, with the
predicate being equivalent to a proof that the element is possible to
construct (in a prolog style fashion).
From the
linked summary, it doesn't seem that this is possible, however I read
somewhere that it was possible to overload values to use a Java module (see
Nat). Is there any documentation on how to do
this?
In the short term I'm planning on generating
a sufficiently large finite subset and hoping that values outside of it are
not
generated.
Thanks,
Chris
On
Saturday 06 November 2021 11:27:02 AM (+00:00), Leslie Lamport
wrote:
A
predicate does not define a set. The TLA+ operators for
constructing sets are listed under the "Sets" heading on the "Constant
Operators" section of:
https://lamport.azurewebsites.net/tla/summary-standalone.pdf
If
the "set" you want to define cannot be expressed with them, it is probably
not what mathematicians define to be a
set.
Leslie
On Friday, November
5, 2021 at 11:05:58 AM UTC-7 Chris Jensen wrote:
Hi!
When you have a type invariant for a system like Paxos, you can check
that
for example ballot numbers are members of the set of natural numbers.
What I am trying to do (and can't seem to find any documentation on) is
how
to define my own infinite sets (for example one which is defined by
some
predicate).
This is specifically just for type checking, and thus should just be
checking whether a value is an element of a set, hence should just be
able
to use the predicate.
Is there any way to do this?
--
Thanks,
Chris
You received this message because you are subscribed to the Google Groups
"tlaplus" group.
To unsubscribe from this group and stop receiving emails from it, send an
email to tlaplus+unsubscribe@xxxxxxxxxxxxxxxx.
To view this discussion on the web visit https://groups.google.com/d/msgid/tlaplus/3ad9a5c4-d76f-4e8b-b670-e2378ee46155n%40googlegroups.com.
--
Thanks,
Chris
You received this message because you are subscribed to the Google Groups "tlaplus" group.
To unsubscribe from this group and stop receiving emails from it, send an email to tlaplus+unsubscribe@xxxxxxxxxxxxxxxx.
To view this discussion on the web visit https://groups.google.com/d/msgid/tlaplus/1636365615616.605710175.720244640%40aol.com.