Yes. Behold a Murmur3 hash collision:
user> (def n1 -2023261231)
#'user/n1
user> (def n2 9223372036854771971)
#'user/n2
user> (== (hash n1) (hash n2))
true
user> (def s1 (conj #{} n1 n2))
#'user/s1
user> (def s2 (conj #{} n2 n1))
#'user/s2
user> (= s1 s2)
But practically, I cannot think of any scenario where you will need a
guarantee that two unordered non identical but value equivalent collections
need to produce same ordered seq.
JW
On Sat, Feb 8, 2014 at 10:14 PM, Andy C <andy.coolw...@gmail.com> wrote:
> On Sat, Feb 8, 2014 at 1:46 PM, Jozef Wagner <jozef.wag...@gmail.com>wrote:
>
>> Two collections equivalent by their values may easily have a different
>> order of their items.
>>
>
>
> It all boils down this:
> is it possible to have two clojure.lang.PersistentHashSet with identical
> values (in mathematical sense) but producing different seqs?
>
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