Abstract
It is proposed to express time as a composition of three auxiliary variables tx, ty, tz. which will be named components of vector t. Event P is expressed as a composition of six variables x, y, z, tx, ty, tz in R6 or of three coordinates ξ = x + itx, η = y + ity, and ζ = z + itz in C3. A quadratic function is defined, called 'carré simple', of P, which comes to the same as taking the square of the Lorentzian form of P in R4, equalling.s2. In this formalism, length r(x, y, z) and time t (tx, ty, tz) play roles exactly symmetrical and are exchangeable one for the other. This formalism will be applied to trichromatic theory.

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