Goals Theory A priori Up a(uh,)=e(u),V0∈Xh (00。0)三 Wr Vr da, e(o)=f 0 a 0 Xh={v∈Xvl2∈m1(T),VTh∈Th} SMA-HPO⊙1999M Poisson in IR: Theory Practice 3