16.2. Operators

Operators are defined as (linking) expressions for the expression of mathematical operations and intervals. In terms of their form they are both subordinating and co-ordinating expressions. Operators comprise in particular:

The rules for the annotation of mathematical operations and intervals are described in Section 11, "Mathematical operations and intervals".

An operator is represented in the tectogrammatical tree by a separate node only in cases where mathematical operations or intervals are represented as a paratactic structure. The node representing an operator then stands for the root node of this paratactic structure (functor=OPER).

T-lemma. The t-lemma of the node representing the operator of the mathematical operation is the sign of the relevant mathematical operation, either in the form of the t-lemma substitute (#Colon for the colon, #Slash for the slash) or (in a case where a t-lemma substitute has not been provided for a given sign) in the form in which it occurs in the text: thus either as a symbol (for example: +), or as a word (for example: plus (=plus)).

In the t-lemma of the node for the operator of the interval realised by a combination of prepositional phrases the respective prepositions are joined by an underscore (od_přes_do (=from_through_to); see also the section on multi-word t-lemmas Section 3, "T-lemmas of multi-word (complex) lexical units"). Individual combinations of prepositions expressing an interval are realised at surface level by various formal variants (od - do (=from - to), od - po (=from - to), od - k (=from - towards)). For the respective formal variants one representative variant is always selected, recorded as the t-lemma of the node the operator represents in the tectogrammatical tree (od_do (=from - to)).

The expression "". The expression až (=until) has a dual function in the expression of mathematical operations and intervals: