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1 vote

Formalization of n-ary functions

You might consider looking into abstract clones. I don't have a reference handy, but for concrete clones chapter 4 section 4.1 of "Algebras, Lattices, Varieties" by McKenzie, McNulty, and Taylor has …
Gerhard Paseman's user avatar
7 votes

Gently falling functions

I will post this as an answer rather than as a series of comments. In order to emphasize the gently part, you should focus on concave down functions ( or whatever is the nontrivial direction; I thin …
Gerhard Paseman's user avatar
2 votes

Some weird "system" of inequalities in nonnegative integers.

I see this as more of a set selection problem or a combinatorial design problem than a number theory problem, unless there is something else about the $a_{ijkl}$ that is not being mentioned. By setti …
Gerhard Paseman's user avatar