JuMP interprets "Monday" as an index set (it’s an iterable object). If you want a one-element set, write ["Monday"] instead, i.e., @variable(model, x[10,[1,2,5],["Monday"]], Bin).
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JuMP interprets "Monday" as an index set (it’s an iterable object). If you want a one-element set, write ["Monday"] instead, i.e., @variable(model, x[10,[1,2,5],["Monday"]], Bin).