Samuele Giraudo
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 Nov 1 awarded Yearling Oct 1 comment Is there an operad that codifies groupoids? @QiaochuYuan: it is not true that operads cannot encode relations with multiple occurrences of a given variable. For instance flexible algebras, that are nonassociative algebras wherein product satisfies $(xy)x = x(yx)$, can be encoded by a symmetric operad (see mathoverflow.net/questions/128547/…? for instance). Sep 5 awarded Nice Question Jul 16 revised Sum over growing Young tableaux Typo in the title and "Plancharel" -> "Plancherel" Jul 16 suggested approved edit on Sum over growing Young tableaux Jan 10 comment Intersection of free objects And by the way, thanks for the reference! Jan 10 accepted Intersection of free objects Jan 10 comment Intersection of free objects Indeed, I know for the while only the proof given in Lothaire's $\textit{Combinatorics on words}$. The reason why I ask this is because I consider intersection of many other free (combinatorial) algebraic structures than monoids and I would hope that a categorical argument imply their freeness. Since this is not the case (see Jeremy's answer) the only way seems to proceed case by case. Jan 10 comment Intersection of free objects Great example. Thanks, Jeremy. Jan 10 asked Intersection of free objects Dec 26 revised “The” random tree Indentation fix in Sage code. Oct 11 awarded Constituent Oct 10 awarded Caucus Sep 4 comment How universal is operadic approach to studying algebras? What is the statement of the theorem that someone should prove? Besides, do you have an example of an algebraic structure which, like groups, cannot be straightforwardly captured by operads, but, unlike groups, a "sneaky" presentation of it makes that it can be? Aug 12 comment Aspherical operads You call "monochromatic" any coloured operad on only one colour? The construction you describe is a classical construction from operads to PROs (see Operads and PROPs of M. Markl, Example 60). Aug 8 awarded Excavator Aug 8 revised Subgroups of p-groups Add an occurrence of the word "order" and a typo corrected. Aug 8 suggested approved edit on Subgroups of p-groups Aug 8 comment Equivalent paths in graphs @ViditNanda: I think a "face" is a cycle here. Jul 30 comment Arithmetic product of symmetric functions: why is it integral? How this product expresses on the monomial, elementary, and Schur bases of symmetric functions?