Synonyms
Different authors have used a great variety of names for the split-complex numbers. Some of these include:
- (real) tessarines, James Cockle (1848)
- (algebraic) motors, W.K. Clifford (1882)
- hyperbolic complex numbers, J.C. Vignaux (1935)
- bireal numbers, U. Bencivenga (1946)
- approximate numbers, Warmus (1956), for use in interval analysis
- countercomplex or hyperbolic numbers from Musean hypernumbers
- double numbers, I.M. Yaglom (1968) and Hazewinkel (1990)
- anormal-complex numbers, W. Benz (1973)
- dual numbers, L. Kauffman (1985) and J. Hucks (1993)
- perplex numbers, P. Fjelstad (1986) and Poodiack & LeClair (2009)
- Lorentz numbers, F.R. Harvey (1990)
- hyperbolic numbers, G. Sobczyk (1995)
- split-complex numbers, B. Rosenfeld (1997)
- duplex numbers, J. Kocik (1999)
- spacetime numbers, N.A. Borota (2000)
- twocomplex numbers, S. Olariu (2002)
Split-complex numbers and their higher-dimensional relatives (split-quaternions / coquaternions and split-octonions) were at times referred to as "Musean numbers", since they are a subset of the hypernumber program developed by Charles Musès.
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