Lemma expf_B0_CS_1_b_prel1:forall (m:fmap)(x:dart)(i j:nat), inv_hmap m -> succ m zero x -> let x0 := cA m zero x in let xb0 := bottom m zero x in let xh0 := top m zero x in let xh0_1 := cA_1 m one xh0 in let p := MF.Iter_upb m xh0_1 in let z := Iter (cF m) i xh0_1 in x0 = Iter (cF m) j xh0_1 -> (i <= j < p)%nat -> expf (B m zero x) xh0_1 z.