--- a/src/SbpOperators/boundaryops/normal_derivative.jl	Mon Feb 21 10:33:58 2022 +0100
+++ b/src/SbpOperators/boundaryops/normal_derivative.jl	Fri Feb 03 22:14:47 2023 +0100
@@ -1,18 +1,26 @@
 """
-    normal_derivative(grid::EquidistantGrid, closure_stencil::Stencil, boundary::CartesianBoundary)
-    normal_derivative(grid::EquidistantGrid{1}, closure_stencil::Stencil, region::Region)
+    normal_derivative(grid, closure_stencil::Stencil, boundary)
 
-Creates the normal derivative boundary operator `d` as a `TensorMapping`
+Creates the normal derivative boundary operator `d` as a `LazyTensor`
 
-`d` is the normal derivative of a grid function at the boundary specified by `boundary` or `region` using some `closure_stencil`.
+`d` computes the normal derivative of a grid function  on `boundary` a `Stencil` `closure_stencil`.
 `d'` is the prolongation of the normal derivative of a grid function to the whole grid using the same `closure_stencil`.
 On a one-dimensional `grid`, `d` is a `BoundaryOperator`. On a multi-dimensional `grid`, `d` is the inflation of
-a `BoundaryOperator`. Also see the documentation of `SbpOperators.boundary_operator(...)` for more details.
+a `BoundaryOperator`.
+
+See also: [`BoundaryOperator`](@ref), [`LazyTensors.inflate`](@ref).
 """
-function normal_derivative(grid::EquidistantGrid, closure_stencil, boundary::CartesianBoundary)
+function normal_derivative(grid, closure_stencil, boundary)
     direction = dim(boundary)
     h_inv = inverse_spacing(grid)[direction]
-    return SbpOperators.boundary_operator(grid, scale(closure_stencil,h_inv), boundary)
+
+    op = BoundaryOperator(restrict(grid, dim(boundary)), scale(closure_stencil,h_inv), region(boundary))
+    return LazyTensors.inflate(op, size(grid), dim(boundary))
 end
-normal_derivative(grid::EquidistantGrid{1}, closure_stencil, region::Region) = normal_derivative(grid, closure_stencil, CartesianBoundary{1,typeof(region)}())
-export normal_derivative
+
+"""
+    normal_derivative(grid, stencil_set, boundary)
+
+Creates a `normal_derivative` operator on `grid` given a `stencil_set`.
+"""
+normal_derivative(grid, stencil_set::StencilSet, boundary) = normal_derivative(grid, parse_stencil(stencil_set["d1"]["closure"]), boundary)