Yatsugatake Workshop, 2025
Wild Ramification and Etale Homotopy
Organizing Committee:
Ko Aoki (MPIM), Federico Binda (Milano), Wataru Kai (Sendai), Alberto Merici (Heidelberg), Hiroyasu Miyazaki (NTT), Shuji Saito (Tokyo)Speakers
Tomoyuki Abe (University of Tokyo)
Piotr Achinger (Warszawa)
Teppei Nakamura (Kyoto)
Fei Ren (Wuppertal)
Daichi Takeuchi (Institute of Science Tokyo)
Takeshi Tsuji (University of Tokyo)
Yuri Yagawasa (Institute of Science Tokyo)
This workshop is supported by
JSPS Grant-in-Aid (S) 24H00015 representative Nobuo Tsuzuki
JSPS Grant-in-aid (Early-Career Scientists) #21K13783 representative Hiroyasu Miyazaki,
JSPS Grant-in-Aid (C) #24K06699 representative Hiroyasu Miyazaki
JSPS Grant-in-aid (B) #25K00904 representative Shuji Saito.
Program
17(Wed)/Sep:
9:30-10:45 Achinger, "Overview"
11:15-12:30 , "Background on ramification theory"
14:30-15:45 , "Nearby cycles"
16:15-17:30 , "Variation of the Swan conductor"
18(Thu)/Sep:
9:30-10:45 , "The singular support and the Radon transform (I)"
11:15-12:30 , "The singular support and the Radon transform (II)"
14:30-15:45 , "Characteristic cycle (I): the Milnor formula and integrality"
16:15-17:30 , "Characteristic cycle (II): the index formula and compatibility with pull-back"
19(Fri)/Sep:
9:30-10:45 -, "Recap talk"
11:15-12:30 , "The K(π,1) theorem (I): the Bertini theorem"
14:30-15:45 , "Gabber’s affine analog of proper base change"
16:15-17:30 "The K(π,1) theorem (II): the end of the proof, corollaries"
20(Sat)/Sep:
9:30-10:45 , "The Frobenius-Witt cotangent bundle"
11:15-12:30 , "Singular support in mixed characteristic (I)"
14:30-15:45 , "Singular support in mixed characteristic (II)"
16:15-17:30 , "Quantitative sheaf theory"
21(Sun)/Sep:
10:00-12:00 "Concluding remarks":