## 11. **Mathematical operations and intervals**

Mathematical operations (addition, subtraction, multiplication, division/proportion) are analyzed solely as paratactic structures with the functor `OPER`

(see below in Section 11.1, "Mathematical operations").

Intervals (temporal, spatial or other) are analyzed in two different ways: either as paratactic structures with the `OPER`

functor assigned to their root nodes, as well (see Section 11.2.3, "Intervals analyzed as a paratactic structure"), or by means of appropriate temporal and locative/directional functors (see Section 11.2.1, "Temporal intervals analyzed by means of temporal functors" and Section 11.2.2, "Spatial intervals analyzed by means of locative/directional functors").

Members of mathematical operations and intervals are called *operands*. Expressions conveying the meaning of the relevant operation or interval are called *operators*.