YES Problem: strict: f(x) -> x weak: a() -> g(a()) Proof: Arctic Interpretation Processor: dimension: 4 interpretation: [0] [0] [a] = [0] [0], [1 0 0 0] [0 1 0 0] [f](x0) = [0 0 1 0]x0 [0 0 0 1] , [0 0 0 0 ] [0 -& 0 -&] [g](x0) = [-& -& 0 0 ]x0 [-& -& -& -&] orientation: [1 0 0 0] [0 1 0 0] f(x) = [0 0 1 0]x >= x = x [0 0 0 1] [0] [0 ] [0] [0 ] a() = [0] >= [0 ] = g(a()) [0] [-&] problem: strict: weak: a() -> g(a()) Qed