 Hence the shift of the entire sequence "X" by one step to the right means a joint transformation of the quantities formula_85 and formula_90 according to

This is a [[Bijection|one-to-one mapping]] in the [[unit square]].Thus we have now a one-to-one transformation of two quantities instead of a not one-to-one transformation "Tx" = {1/"x"} of one quantity.The quantities formula_85 and formula_90 have a joint stationary distribution
"P"("x"+, "x"−).