31. Although grammatically the dual number can be applied to any word, in practice it was used quite sporadically during the last century. 32. According to G�ldemann, the non-Khoe Khoesan languages ( Kx'a ), do not have dual number marking of nouns. 33. Historically, the dual number has been a full grammatical number, participating as the third element in singular-dual-plural distinction. 34. Proto-Balto-Slavic still distinguished three Sorbian are the only remaining Slavic languages that still make consistent use of the dual number . 35. Besides the specific differences given below, it should be noted that nouns, verbs and adjectives still had separate endings for the dual number . 36. In 1946 U . Bencivenga published an essay on the dual numbers and the split-complex numbers where he used the term bireal number. 37. It has been preserved in a number of dialects but the meaning of words in the dual number is equal to their blending in plural. 38. Another application involves using split-complex numbers, dual numbers , and ordinary complex numbers, to interpret a real matrix as a complex number. 39. The concepts of the dual number and its " imaginary " ?, ? 2 = 0, do not appear in the development of Galilean geometry. 40. For instance, the root pac meaning " to cook ", takes the following forms in the dual number of the present tense, called lam lakra:
