Actually, I found this post:

https://groups.google.com/forum/?fromgroups=#!topic/clojure/hz63yeQfiQE

But the not operator has to be used first to ensure that the term is 
ground.  It was a little confusing.

On Thursday, 28 March 2013 14:54:31 UTC-4, JvJ 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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