Philippe
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 Jan 27 accepted Embedding tuples of natural numbers into real numbers Jan 27 revised Embedding tuples of natural numbers into real numbers added 163 characters in body Jan 27 comment Embedding tuples of natural numbers into real numbers @StevenStadnicki good point. I'll clarify the question now to specify what else I'd like to hold (somehow failed to make this explicit) Jan 27 asked Embedding tuples of natural numbers into real numbers Jul 29 awarded Nice Question Jun 21 comment Resource allocation with minimal differences Thank you for the answer. I suspected this might be an issue, hence the subquestion with the additional constraint. Any idea on a general construction in that case? Jun 18 revised Resource allocation with minimal differences edited tags Jun 17 asked Resource allocation with minimal differences Apr 5 comment Cartesian products represented as disjoint unions Thanks for your answer. It got me thinking a little more, and I wonder now if I cannot get to $k{\cdot}n$, by representing $S$ as $((S_1 \setminus \{ s^1 \}) \times \ldots \times S_k) \cup (\{ s^1 \} \times \ldots \times S_k)$, then splitting $S_2$ in that second member, etc. In fact, I now suspect this could work for $S \setminus X$, where $X$ is an arbitrary Cartesian product from subsets of $S_1, \ldots, S_k$... Maybe someone can work a full answer, or I'll try myself. Apr 4 asked Cartesian products represented as disjoint unions Oct 3 comment Simplify a factorial @LuigiPlinge OK.. My colleague's whiteboard has the same sequence written all over it, complete with lots of little hand-drawn trees, that's why I was asking :) Also, for such things the On-Line Encyclopedia of Integer Sequences is a great resource. Oct 2 comment Simplify a factorial Were you computing the possible arrangements of a commutative, non-associative, operator over n terms, by any chance? Sep 26 comment Multiplications by unimodular matrices Simple as that. Thanks. Sep 26 accepted Multiplications by unimodular matrices Sep 26 asked Multiplications by unimodular matrices Sep 8 revised How many $n\times m$ binary matrices are there, up to row and column permutations? deleted 19 characters in body Sep 8 awarded Citizen Patrol Feb 21 awarded Editor Feb 21 revised Examples of apparent patterns that eventually fail formatting Feb 21 suggested approved edit on Examples of apparent patterns that eventually fail