Note that Inuktitut has a fully productive dual number, present in all three persons.
Furthermore, the concept of the dual number is necessary when reading a matrix.
It has a dual number and doesn't have a negative voice.
Some languages also have a dual number or other arrangements.
In many languages, there is also a dual number (used for indicating two objects).
Languages of the Brythonic branch do not have dual number.
Modern Baltic languages have also retained the old dual number.
Similarly, the algebra of dual numbers over any field is local.
In the 16th century dual number disappeared from the literary language.