diff --git a/stl/__init__.py b/stl/__init__.py
index 063bb16..a3574eb 100644
--- a/stl/__init__.py
+++ b/stl/__init__.py
@@ -5,4 +5,3 @@ from stl.parser import parse
 from stl.synth import lex_param_project
 from stl.boolean_eval import pointwise_sat
 from stl.fastboolean_eval import pointwise_satf
-from stl.smooth_robustness import smooth_robustness
diff --git a/stl/smooth_robustness.py b/stl/smooth_robustness.py
index 25ef934..f618398 100644
--- a/stl/smooth_robustness.py
+++ b/stl/smooth_robustness.py
@@ -42,11 +42,13 @@ def admissible_params(phi, eps, L):
 
 
 def symbolic_params(phi, eps, L):
+    L = sym.Dummy("L")
+    eps = sym.Dummy("eps")
     return Param(
-        L=sym.Dummy("L"),
-        h=sym.Dummy("h"),
+        L=L,
+        h=sample_rate(eps, L),
         B=sym.Dummy("B"),
-        eps=sym.Dummy("eps"),
+        eps=eps,
     )
 
 def smooth_robustness(phi, *, L=None, eps=None):
diff --git a/stl/utils.py b/stl/utils.py
index e14eeea..d4e3b6b 100644
--- a/stl/utils.py
+++ b/stl/utils.py
@@ -4,7 +4,7 @@ from lenses import lens, Lens
 import funcy as fn
 import sympy
 
-from stl.ast import LinEq, And, Or, NaryOpSTL, F, G, Interval
+from stl.ast import LinEq, And, Or, NaryOpSTL, F, G, Interval, Neg
 
 def walk(stl, bfs=False):
     """Walks Ast. Defaults to DFS unless BFS flag is set."""
@@ -88,23 +88,23 @@ def set_params(stl_or_lens, val):
 
 
 def f_neg_or_canonical_form(phi):
-    if isinstance(phi, stl.LinEq):
+    if isinstance(phi, LinEq):
         return phi
 
     children = [f_neg_or_canonical_form(s) for s in phi.children()]
-    if isinstance(phi, (stl.And, stl.G)):
-        children = [stl.ast.Neg(s) for s in children]
+    if isinstance(phi, (And, G)):
+        children = [Neg(s) for s in children]
     children = tuple(children)
 
-    if isinstance(phi, stl.Or):
-        return stl.Or(children)
-    elif isinstance(phi, stl.And):
-        return stl.Neg(stl.Or(children))
-    elif isinstance(phi, stl.Neg):
-        return stl.Neg(children[0])
-    elif isinstance(phi, stl.F):
-        return stl.F(phi.interval, children[0])
-    elif isinstance(phi, stl.G):
-        return stl.Neg(stl.F(phi.interval, children[0]))
+    if isinstance(phi, Or):
+        return Or(children)
+    elif isinstance(phi, And):
+        return Neg(Or(children))
+    elif isinstance(phi, Neg):
+        return Neg(children[0])
+    elif isinstance(phi, F):
+        return F(phi.interval, children[0])
+    elif isinstance(phi, G):
+        return Neg(F(phi.interval, children[0]))
     else:
         raise NotImplementedError