Notes for AKT-140324/0:51:37

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Showing that the box coproduct respects the 4T relation.

Throughout, the tensor of two diagrams actually refers to a sum of all possible ways of placing the connected components of the sub-diagrams 1, 2, 3, and 4 on the left or right side of the tensor, in line with the definition of box.

Box with 4T-1.jpg