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  • $\begingroup$ Thanks! So I guess this definition of coadd is what is standard? $\endgroup$
    – Daigo
    Commented Jun 25, 2022 at 7:44
  • $\begingroup$ I wouldn't say that. Yours is more like concatenation and mine is more like interweaving. Mine happens to be better suited for proving commutativity. $\endgroup$ Commented Jun 25, 2022 at 7:45