On fields inspired with the polar HSV -- RGB theory of Colour

A three-polar, cf. T. Gregor, J. Halu\v{s}ka, Lexicographical ordering and field operations in the complex plane. Stud. Mat. 41(2014), 123–133., $HSV-RGB$ Colour space $\mathrm{△}$ was introduced and studied. It was equipped with operations of addition, subtraction, multiplication, and (partially) division. Achromatic Grey Hues form an ideal $\mathfrak{S}$. Factorizing $\mathrm{△}$ by the ideal $\mathfrak{S}$, we obtain a field $\triangle | \mathfrak{S}$\mathrm{.}Anelement(i\mathrm{.}eanindividualColour)in$\triangle | \mathfrak{S}$ is a triplet of three triangular coefficients. The set of all triangular coefficients is a subset of a semi-field of parabolic-complex functions. For the parabolic-complex number set, cf.~A. A. Harkin–J. B. Harkin, Geometry of general complex numbers. Mathematics magazine, 77(2004), 118–129.