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Aug 30, 2016 at 20:28 comment added Michael What if there is no underlying field for linearity, only convolution and product operations?
Oct 8, 2012 at 22:37 comment added Tom Copeland You got me. I usually ask a variant of this question at wedding parties along with "You call that a ring?!"
Oct 8, 2012 at 13:03 history answered Alexandre Eremenko CC BY-SA 3.0