Peng Zhou

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blog:2023-04-22

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blog:2023-04-22 [2023/04/22 10:25] – created pzhoublog:2023-04-22 [2023/06/25 15:53] (current) – external edit 127.0.0.1
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 Now, here are the problems  Now, here are the problems 
  
-==== ==== +==== Major Issues ==== 
-Where is the key estimate+ 
 +=== 1 === 
 +Where is the key estimate  
 +$$ SS(\pi_* Sh(\La_B)) \In \pi_*(SS(Sh(\La_B)) $$ 
 +established?  
 + 
 +A similar estimate for sheaves valued in stable category is well-known (hmm, my stuff is also stable, right? closed under cones etc). So, is my notion of singular support different from the standard one?  
 + 
 +Hmm, I justed bluffed that this is obvious, but now I am caught here. But, why is it not obvious? Naively, the singular support of a sheaf of anything is defined by the nearby cycle functor, no?  
 + 
 +OK, I see. The referee is complaining I am using a seemingly different notion of singular support for categories than Kashiwara-Schapira. Indeed, when the space is stratified, and we have a priori bound, then maybe we can use the old notion.  
 + 
 +OK, indeed, I will say singular support for stable categories as is, and only remark that in case of constructible sheaves, this can be checked without much effort.  
 + 
 +Not a big deal :) 
 + 
 +=== 2 === 
 +Aha, classically generate means the smallest stable subcategories that contains these object.  
 + 
 +Good question, why do they generate, well because back in $\La_{\C^N}$, they compactly generate the large category.  
 + 
 +As David Nadler says "the only nice construction in category is universal construction'.  
 + 
 +ok,this is already on p22.  
 + 
 +=== 3 === 
 +Not a big deal, just need to add: because in this grid stratified case, singular support can be estimated easily.  
 + 
 +==== Minor Issues ==== 
 + 
 +1. I really need to be precise! ahh. being complained. so, let me be more precise. Constructible sheaf with stratification $S$ is related to Lagrangians with singular support $\Lambda_S$.  
 + 
 +2. yes, Segal introduced this notion.  
 + 
 +3. better reference habit, give precise reference. Yes, we understand you are lazy, but please don't be lazy.  
 + 
 +4. give reference to the later introduced FLTZ skeleton.  
 + 
 +5. indeed, the notion of partially wrapped CCC is new. let me think how to recover that. I think this is best done by this: starting from the equivariant CCC, then on the B-side, we de-equivariantize on a subgroup, meaning we forget the equivariant structure.  
 + 
 +... 
 + 
 +6. yes, forward reference about symplectic reduction should be given.  
 + 
 +7. 
  
  
blog/2023-04-22.1682159107.txt.gz · Last modified: 2023/06/25 15:53 (external edit)