"Luxurious" is a term from psychology, where it's used to describe "ornamental" behavior, which may be hinting at something deeper. ;-) In the particular case,

"Luxurious" is a term from psychology, where it's used to describe "ornamental" behavior, which may be hinting at something deeper. ;-) In the particular case, I just found it interesting, since the duplicate outputs are already well established, before the text "withdraws" to monotonic functions (for which both inputs are used). A bit of an understatement. Edit: I think, "luxurious" as used this way is a great term, because it doesn't attempt to apply any classification. It's just pointing out that there's a somewhat independent process, which consumes energy.