Alright, I'm starting to get it.... but not quite there
(run* [q]
(fresh [x]
(conde
( (== q 1) )
( (== q 2) )
( (== q 3) )
( (== q 4) ))
(conde
( (== x 3) )
( (== x 4) )
( (== x 5) )
( (== x 6) ))
(!= q x)))
(1 1 1 2 1 2 2 2 3 4 3 3 4 4)
On Thursday, 28 March 2013 15:44:01 UTC-4, David Nolen wrote:
>
> This won't work. Rewrite this example w/o using facts and try to
> understand why it won't work.
>
> David
>
> On Thu, Mar 28, 2013 at 3:37 PM, JvJ <[email protected] <javascript:>>wrote:
>
>> Here's what I'm trying...
>>
>> (facts a [[1]
>> [2]
>> [3]
>> [4]])
>> nil
>> (facts b [[3]
>> [4]
>> [5]
>> [6]])
>>
>> (run* [q]
>> (a q)
>> (fresh [x]
>> (b x)
>> (!= q x)))
>> (1 1 2 1 1 2 2 2 3 4 3 3 4 4)
>>
>> So what the heck is this all about?
>>
>> On Thursday, 28 March 2013 15:17:24 UTC-4, David Nolen wrote:
>>
>>> negation is hard. This has come up several times. It may be possible to
>>> a better form of negation as failure via delays, but this not high on my
>>> current priority list. Patches to make it work are of course most welcome.
>>>
>>>
>>> On Thu, Mar 28, 2013 at 2:54 PM, JvJ <[email protected]> wrote:
>>>
>>>> Thanks, but there's another aspect to this.
>>>>
>>>> Let's say I had two relations A and B, and I wanted all q such that
>>>> (A q)
>>>> (not (B q))
>>>>
>>>> How would that work?
>>>>
>>>>
>>>> On Thursday, 28 March 2013 14:50:33 UTC-4, Jim foo.bar wrote:
>>>>
>>>>> clojure.set/difference
>>>>> 'membero' combined with its negated form?
>>>>>
>>>>> Jim
>>>>>
>>>>> On 28/03/13 18:47, JvJ wrote:
>>>>> > In core.logic, how do the following: "Give me everything that is a
>>>>> > member of list A and not a member of list B"?
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