Likewise, El-Gabaly noted further that the Double Complex
for Olefins project will be set up for the production of ethylene, monoethylene glycol, and polyethene terephthalate PET, with a total annual production capacity of 600,000 tonnes.
For balanced single circuit lines exact analytical formulas can be obtained by representing elliptically polarized fields by double complex numbers  or complex vectors  whereas approximated formulas can be estimated by a multipole expansion of Biot-Savart's law .
A closed form solution for three phase lines with polygonal phase conductor arrangement has been derived in  by using double complex numbers with two imaginary units.
In this paper we answer the question asked for double complex sequences mentioned in our abstract.
We obtain a summability method that maps the double complex sequence w into the double complex sequence Aw where the mnth term of Aw is as follows:
The four dimensional real matrix A is said to be bounded regular if every bounded P-convergent double complex sequence w with Pringsheim limit t, is also A-summable to t and the A-means of w are bounded.
C WORK : DOUBLE COMPLEX ARRAY OF DIMENSION(2, 0:2*NMAX) .
DOUBLE COMPLEX WORK(2, 0:2*NMAX) DOUBLE PRECISION DIFABS(50),DIFREL(50), + FZINV(50) ,TARRAY(50), + ERROR(3,50) ,ERR(3) INTEGER IFAIL(50),IFZEVAL(50) C ..
He covers dynamics, dimensional groups, the complexes of an s/u-bijective factor map, the double complexes
of an s/u-bijective pair, a Lefschetz formula, examples, and questions.