Using 𝜌 as the input function, a GB decomposition yields the condensed charge density (ℱ[𝜌] = 𝒫), using the gradient or Laplacian forms of the kinetic energy density yields the condensed kinetic energy density (ℱ[𝑇 ) ] = ℱ[𝑇 * ] = 𝒯) , etc. If the constant function 𝐹 ! (𝜃, 𝜙, 𝑠) = 1 is used as input, the gradient bundle condensed volume is produced (ℱ[1] = 𝒱), which has been shown to be a functional of the Gaussian curvature of charge density isosurfaces within each gradient bundle .