Let $M=\oplus_{i\ge 0}M_i$ and $N=\oplus_{i\ge 0}N_i$ two graded modules over a commutative ring $R$. What is their coproduct? Is it their tensor product $M\otimes_k N$?
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2026-03-25 11:09:35.1774436975
Coproduct of graded modules
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