A derivation starts with an initial tree, combining via either substitution or adjunction.
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Adjunction inserts an auxiliary tree into the center of another tree.
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A few very simple rewrite rules suffice to generate the vocabulary of strings for adjunction rules.
From the en.wikipedia.org
More examples
Junction: an act of joining or adjoining things
(adjunctive) joining; forming an adjunct
In mathematics, adjoint functors are pairs of functors which stand in a particular relationship with one another, called an adjunction. The relationship of adjunction is ubiquitous in mathematics, as it rigorously reflects the intuitive notions of optimization and efficiency. ...
In abstract algebra, adjunction is a construction in field theory, where for a given field extension E/F, subextensions between E and F are constructed.
A form of similarity between a pair of categories and which is weaker than equivalence, which in turn is weaker than isomorphism. ...
(adjunctive) a connector joining two components of the same weight, such as a coordinating conjunction; a substance added as a supplement; often in the phrase "additives and adjunctives. ...
(adjunctive) A secondary treatment in addition to the primary therapy.
When a verb is placed at the beginning or the end of a sentence instead of in the middle. For example (from Rhetorica ad Herennium), "At the beginning, as follows: 'Fades physical beauty with disease or age.' At the end, as follows: 'Either with disease or age physical beauty fades.'"
This is a process by which one constituent is adjoined (= attached) to another to form a larger constituent of the same type. ...