Using the bicomplex numbers T which is a commutative ring with
zero divisors defined by T={w0+w1i1+w2i2+w3j∣w0,w1,w2,w3∈R} where i12=−1,i22=−1,j2=1,i1i2=j=i2i1, we construct hyperbolic and bicomplex Hilbert spaces.
Linear functionals and dual spaces are considered and properties of linear
operators are obtained; in particular it is established that the eigenvalues of
a bicomplex self-adjoint operator are in the set of hyperbolic numbers.Comment: 25 pages, no figur