Link grammar also differs from traditional dependency grammars by allowing cyclic relations between words.
2.
Using a reciprocity relation for \ tfrac { \ partial z } { \ partial y } on this equation and reordering gives a cyclic relation ( the triple product rule ),
3.
Some time between the years 500 BC and 400 BC they identified and began to use the 19-year cyclic relation between lunar months and solar years now known as the Metonic cycle.
4.
There are a few different symbols in use for a cyclic relation . uses concatenation : . and use ordered triples and the set membership symbol : . uses concatenation and set membership :, understanding as a cyclically ordered triple.