“…When is a space of real valued functions, then we take to be the pointwise maximum of u and v while is the pointwise minimum. For Sobolev spaces [ 31 , 33 , 39 ] and spaces [ 34 , 46 , 47 ] complete classifications for valuations intertwining the were established. See also [ 4 , 7 , 10 , 13 , 14 , 25 , 32 , 41 , 50 ].…”