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Is it possible to “mod” the action of a symmetric group on a symmetric operad?



Announcing the arrival of Valued Associate #679: Cesar Manara
Planned maintenance scheduled April 17/18, 2019 at 00:00UTC (8:00pm US/Eastern)Order of a set $X$ acted upon transitively by the Symmetric GroupTriviality of the principal fiber bundle obtained from quotienting a manifold by a free and proper actionExistence of slices for the action of a subgroupSpaces homotopy equivalent to $A_infty$-spacesClarification of notion of proper group action.What is a group action, and how can we apply it to Sylow theoryGroup action of Symmetric group on arbitrary set AThe Modules over Algebras over Operads are not what they seem.Action of a symmetric group in operadBase change of topological operad to any symmetric monoidal model category and $E_n$-algebras outside of $textbfTop$










1












$begingroup$


I am relatively new to category theory, so only have a rough understanding of the technicalities behind operads. My understanding is that symmetric operads are defined so that they are "nicely" acted on by the symmetric group.



My question is: Is it possible to alter this action i.e. quotient the action so that a proper subgroup of the symmetric group acts on the operad?



I do not see how this would raise any issues with the definition of the symmetric operad (for example I think you still have equivariance), but am wondering if any technicalities would prevent me from doing this.










share|cite|improve this question









$endgroup$







  • 2




    $begingroup$
    For full disclosure, I know nothing about operads. But in all the applications I know of, if a group acts on something, so does any of its proper subgroups, and you don't need to take a quotient to realize this action, it's just a restriction.
    $endgroup$
    – Matt Samuel
    Mar 25 at 22:36











  • $begingroup$
    I don't understand the question. An operad consists of various bits which have various symmetric group actions on them. You can certainly take a particular operad and restrict these actions to subgroups. But it sounds like what you want is to alter the definition, to make a new type of operad involving actions by various subgroups of the symmetric groups. Is that right?
    $endgroup$
    – Qiaochu Yuan
    Mar 25 at 23:48










  • $begingroup$
    Yes, that's exactly what I mean. I'm wondering if I can define a new type of operad by somehow altering the action of the symmetric group on a symmetric operad.
    $endgroup$
    – Brendan Mallery
    Mar 26 at 0:25















1












$begingroup$


I am relatively new to category theory, so only have a rough understanding of the technicalities behind operads. My understanding is that symmetric operads are defined so that they are "nicely" acted on by the symmetric group.



My question is: Is it possible to alter this action i.e. quotient the action so that a proper subgroup of the symmetric group acts on the operad?



I do not see how this would raise any issues with the definition of the symmetric operad (for example I think you still have equivariance), but am wondering if any technicalities would prevent me from doing this.










share|cite|improve this question









$endgroup$







  • 2




    $begingroup$
    For full disclosure, I know nothing about operads. But in all the applications I know of, if a group acts on something, so does any of its proper subgroups, and you don't need to take a quotient to realize this action, it's just a restriction.
    $endgroup$
    – Matt Samuel
    Mar 25 at 22:36











  • $begingroup$
    I don't understand the question. An operad consists of various bits which have various symmetric group actions on them. You can certainly take a particular operad and restrict these actions to subgroups. But it sounds like what you want is to alter the definition, to make a new type of operad involving actions by various subgroups of the symmetric groups. Is that right?
    $endgroup$
    – Qiaochu Yuan
    Mar 25 at 23:48










  • $begingroup$
    Yes, that's exactly what I mean. I'm wondering if I can define a new type of operad by somehow altering the action of the symmetric group on a symmetric operad.
    $endgroup$
    – Brendan Mallery
    Mar 26 at 0:25













1












1








1





$begingroup$


I am relatively new to category theory, so only have a rough understanding of the technicalities behind operads. My understanding is that symmetric operads are defined so that they are "nicely" acted on by the symmetric group.



My question is: Is it possible to alter this action i.e. quotient the action so that a proper subgroup of the symmetric group acts on the operad?



I do not see how this would raise any issues with the definition of the symmetric operad (for example I think you still have equivariance), but am wondering if any technicalities would prevent me from doing this.










share|cite|improve this question









$endgroup$




I am relatively new to category theory, so only have a rough understanding of the technicalities behind operads. My understanding is that symmetric operads are defined so that they are "nicely" acted on by the symmetric group.



My question is: Is it possible to alter this action i.e. quotient the action so that a proper subgroup of the symmetric group acts on the operad?



I do not see how this would raise any issues with the definition of the symmetric operad (for example I think you still have equivariance), but am wondering if any technicalities would prevent me from doing this.







group-theory category-theory symmetric-groups group-actions operads






share|cite|improve this question













share|cite|improve this question











share|cite|improve this question




share|cite|improve this question










asked Mar 25 at 22:33









Brendan MalleryBrendan Mallery

61




61







  • 2




    $begingroup$
    For full disclosure, I know nothing about operads. But in all the applications I know of, if a group acts on something, so does any of its proper subgroups, and you don't need to take a quotient to realize this action, it's just a restriction.
    $endgroup$
    – Matt Samuel
    Mar 25 at 22:36











  • $begingroup$
    I don't understand the question. An operad consists of various bits which have various symmetric group actions on them. You can certainly take a particular operad and restrict these actions to subgroups. But it sounds like what you want is to alter the definition, to make a new type of operad involving actions by various subgroups of the symmetric groups. Is that right?
    $endgroup$
    – Qiaochu Yuan
    Mar 25 at 23:48










  • $begingroup$
    Yes, that's exactly what I mean. I'm wondering if I can define a new type of operad by somehow altering the action of the symmetric group on a symmetric operad.
    $endgroup$
    – Brendan Mallery
    Mar 26 at 0:25












  • 2




    $begingroup$
    For full disclosure, I know nothing about operads. But in all the applications I know of, if a group acts on something, so does any of its proper subgroups, and you don't need to take a quotient to realize this action, it's just a restriction.
    $endgroup$
    – Matt Samuel
    Mar 25 at 22:36











  • $begingroup$
    I don't understand the question. An operad consists of various bits which have various symmetric group actions on them. You can certainly take a particular operad and restrict these actions to subgroups. But it sounds like what you want is to alter the definition, to make a new type of operad involving actions by various subgroups of the symmetric groups. Is that right?
    $endgroup$
    – Qiaochu Yuan
    Mar 25 at 23:48










  • $begingroup$
    Yes, that's exactly what I mean. I'm wondering if I can define a new type of operad by somehow altering the action of the symmetric group on a symmetric operad.
    $endgroup$
    – Brendan Mallery
    Mar 26 at 0:25







2




2




$begingroup$
For full disclosure, I know nothing about operads. But in all the applications I know of, if a group acts on something, so does any of its proper subgroups, and you don't need to take a quotient to realize this action, it's just a restriction.
$endgroup$
– Matt Samuel
Mar 25 at 22:36





$begingroup$
For full disclosure, I know nothing about operads. But in all the applications I know of, if a group acts on something, so does any of its proper subgroups, and you don't need to take a quotient to realize this action, it's just a restriction.
$endgroup$
– Matt Samuel
Mar 25 at 22:36













$begingroup$
I don't understand the question. An operad consists of various bits which have various symmetric group actions on them. You can certainly take a particular operad and restrict these actions to subgroups. But it sounds like what you want is to alter the definition, to make a new type of operad involving actions by various subgroups of the symmetric groups. Is that right?
$endgroup$
– Qiaochu Yuan
Mar 25 at 23:48




$begingroup$
I don't understand the question. An operad consists of various bits which have various symmetric group actions on them. You can certainly take a particular operad and restrict these actions to subgroups. But it sounds like what you want is to alter the definition, to make a new type of operad involving actions by various subgroups of the symmetric groups. Is that right?
$endgroup$
– Qiaochu Yuan
Mar 25 at 23:48












$begingroup$
Yes, that's exactly what I mean. I'm wondering if I can define a new type of operad by somehow altering the action of the symmetric group on a symmetric operad.
$endgroup$
– Brendan Mallery
Mar 26 at 0:25




$begingroup$
Yes, that's exactly what I mean. I'm wondering if I can define a new type of operad by somehow altering the action of the symmetric group on a symmetric operad.
$endgroup$
– Brendan Mallery
Mar 26 at 0:25










1 Answer
1






active

oldest

votes


















0












$begingroup$

Yes. (This paper formulates extra structure on a sequence $G_0,G_1,dots$ of groups to get a theory analogous to the theory of operads.)






share|cite|improve this answer









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    $begingroup$

    Yes. (This paper formulates extra structure on a sequence $G_0,G_1,dots$ of groups to get a theory analogous to the theory of operads.)






    share|cite|improve this answer









    $endgroup$

















      0












      $begingroup$

      Yes. (This paper formulates extra structure on a sequence $G_0,G_1,dots$ of groups to get a theory analogous to the theory of operads.)






      share|cite|improve this answer









      $endgroup$















        0












        0








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        $begingroup$

        Yes. (This paper formulates extra structure on a sequence $G_0,G_1,dots$ of groups to get a theory analogous to the theory of operads.)






        share|cite|improve this answer









        $endgroup$



        Yes. (This paper formulates extra structure on a sequence $G_0,G_1,dots$ of groups to get a theory analogous to the theory of operads.)







        share|cite|improve this answer












        share|cite|improve this answer



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        answered Apr 1 at 1:29









        tcampstcamps

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