The structure of pan-addition + and pan-multiplication . of a commutat
ive isotonic semiring (($) over bar R(+), +, .) is analyzed. We show t
hat if + not equal V (supremum), then (($) over bar R(+), +, .) is a g
-semiring, i.e, a+b = g(-1)(g(a) and g(b)) and a.b = g(-1)(g(a). g(b))
. Conclusions for pan-integrals with respect to a +-measure are shown.