Then form the free k -linear symmetric monoidal category on S by freely forming k -linear combinations of morphisms. This is called kS. Up to equivalence, it has one object for each natural number n, ...

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Brandhuber, Andreas Chen, Gang Travaglini, Gabriele and Wen, Congkao 2021. A new gauge-invariant double copy for heavy-mass effective theory. Journal of High Energy Physics, Vol. 2021, Issue. 7, ...