[[x, y, z] for t in allTriples
| (x := t(1))^3 + (y := t(2))^3 = (z := t(3))^3]
If allTriples goes without repetitions trough all triples of
integers this stream is finite, but I do not want to
exclude such streams.
Well, the dangerous thing with the above stream is that (if there are
just N entries in this stream) you shouldn't ask for an element that
comes after the last one (i.e. wanting to access the (N+1)-th element,
will never succeed).
Honestly, I wouldn't suddently want to run into a never returning
function call. In other words, without otherwise ensuring that only
computable stream elements are accessed, I wouldn't want to see such
stream, no matter how nice they look.
But if you add a restriction like
for t in allTriples while size(t)<10000 | ...
then you basically ensure finiteness and we are back at the distiction
of LazyList vs. infinite Stream.
Ralf
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