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Michel Hack wrote:
I vote YES on Motion 13.04 -- seven standardized interval comparators. This is a good compromise. Three may be theoretically sufficient, but implementations are likely to provide more, and it would be a shame is this resulted in a mess of similar but not identical operations.
Motion 13.04 says in the abstract: ''the number of comparison relations defined by the standard should be kept to a minimum.'' But Motion 13.04 provides only 1/3rd of the necessary comparisons, and only 1/7th of the comparisons provided are necessary. Thus the motion is self-contradictory. Motion 13.04 requires 7 transitive relations, only the second of which is actually useful. The interior relation (the fifth) is not the topological one, and hence will only cause confusion. Two relations disjoint interior(topological) -- both very important in practice -- are missing, Thus Motion 13.04 is _not_ a compromise, but something quite different from my proposal. You may wish to change your vote. Arnold Neumaier