TemporalIntervalRelationPairOLD

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Definition: 

In Allen's interval algebra between a and b there are seven possible relations. All but one has a converse. The exception is the situation where two intervals are coextensive. Then the relation and it converse are the same: equal.

So altogether there are 13 possible relations. Together they are distinct, exhaustive, and qualitative:

  • distinct because no pair of definite intervals can be related by more than one of the relationships
  • exhaustive because any pair of definite intervals are described by one of the relations
  • qualitative (rather than quantitative) because no numeric time spans are considered
Explanatory Notes: 

Here are the relations in Allen's interval algebra:

a precedes b (p) and b is preceded by a (P)
a meets b (m) and b is met by a (M)
a overlaps b (o) and b is overlapped by a (O)
a is finished by b (F) and b finishes a (f)
a contains B (D) and b is during a (d)
a starts b (s) and b is started by a (S)
a and b equal (e) each other

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