where is the C-infinity module over the C-infinity algebra of indecomposable -forms on : those that cannot be written as sums of wedge products of lower degree forms.
Remarks
recall that on generalized smooth spaces there may be higher forms which are indecomposable in that they are not sums of wedge products of lower degree forms. For instance on the generalized space we have no 1-form, but a (hence indecomposable) 2-form.