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Signed Interval Logic [Engel Rischel 94]<br />
Intervals with a direction<br />
i<br />
i<br />
φ ⌢ <br />
ψ<br />
<br />
> j<br />
<br />
φ<br />
<br />
> k for some k<br />
< <br />
ψ<br />
Tallinn, November 17- 21, Michael R. Hansen – p.24/29