On 5/26/19 6:45 PM, Linas Vepstas wrote:
      * SatisfyingSetLink: wiki states that

          EvaluationLink
            PredicateNode "breathe"
            ListLink
              ConceptNode "animals"
              ConceptNode "air"

        is equivalent to this:

          MemberLink
            ListLink
              ConceptNode "animals"
              ConceptNode "air"
            SatisfyingSetLink
              PredicateNode "breathe"

Yes.  However, there is no automatic conversion between the two.

There are PLN rules for that, like this (although this one is a bit convoluted)

https://github.com/opencog/opencog/blob/master/opencog/pln/rules/wip/evaluation-to-member.scm

but yes no automatic way, to do that you need to explicitly run the
rule engine with the appropriate rule base, see

https://wiki.opencog.org/w/Unified_rule_engine

for more details.

Nil

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