financial mathematics

Suggest a suitable filtered probability space S=(,F,F=(Ft)t=0,,T,P ) (you should explicitly define each element of S ) for a Trinomial model: market consists of one riskless asset, with the price process St0=(1+r)t (r>1), and of one risky aset, with the price process S1, s.t., for d1), and of one risky aset, with the price process S1, s.t., for d