The files that live in "tests" are checked with "expected.nrrd" created in the vis branch.
 
					tests files
G×V					in crossField3-x0
V×V					in crossField3-x1
∇×V					in curl2-x0  		curl3-x0
∇×∇𝜑					in curl2-x1 		curl3-x1
∇×(G+V)					in curl2-x2 		curl3-x2
∇×sV					in curl3-x3
  =>(∇×V)s+(∇s)×V
G•V					in dotField2		 dotField3
∇𝜑					in gradient2-x0 	gradient3-x0
∇(𝜑+𝜑)					in gradient-x1 		gradient3-x1
∇(𝜑0*𝜑1)				in gradient-x2 		gradient3-x2
  =>(∇𝜑0)𝜑1+(∇𝜑1)𝜑0
∇⊗∇⊗G					in hessian2 
∇⊗G				        in jacob2 
∇•∇𝜑					in laplac-x0
  =>tr(∇⊗∇𝜑)
∇•∇(𝜑0*𝜑1)				in laplac-x1
  => tr(∇⊗∇𝜑1)𝜑0+tr(∇⊗∇𝜑0)𝜑1+(2*∇𝜑1)•∇𝜑0
G⊗V					in outerField 
tr(G⊗V)					in traceField3d traceFiel2d-x1  traceField2d-x1b