[Topology.beta] FW: DDT&G seminar on Friday in Leiden

[Rot, T.O. (Thomas)]

Renee is speaking!



From: Federica Pasquotto <f.pasquotto at math.leidenuniv.nl>
Date: Tuesday, 15 November 2022 at 16:59
To: Federica Pasquotto <f.pasquotto at math.leidenuniv.nl>
Subject: DDT&G seminar on Friday in Leiden


Dear all,



You are kindly invited to attend this week's Dutch Differential Topology and Geometry seminar:



Speaker: Renee Hoekzema (VU)

Title: "Manifolds with odd Euler characteristics and higher orientability".

Date: Friday 18 November, 14:00

Location: Mathematical Institute, Leiden, room 405 (Snellius building)



Please see below for a more detailed description of the seminar's content.



It will also be possible to follow the seminar online using the login details below:



https://us06web.zoom.us/j/84140801909

Meeting ID: 841 4080 1909
Passcode: 978217



We would like to remind you that master students with an interest in topology and geometry are strongly encouraged to participate.



The schedule for all participants will be as follows:



2:00-3:00 p.m.: first part of the seminar (little to no prior knowledge assumed)

3:30-4:30 p.m.: second part of the seminar (slightly more advanced level)



Please visit the seminar's webpage for additional information and an overview of past and upcoming talks:

https://www.few.vu.nl/~trt800/ddtg.html<https://eur03.safelinks.protection.outlook.com/?url=https%3A%2F%2Fwww.few.vu.nl%2F~trt800%2Fddtg.html&data=05%7C01%7Cf.pasquotto%40math.leidenuniv.nl%7C4938465b710f4073cf6308dabd8b9bbe%7Cca2a7f76dbd74ec091086b3d524fb7c8%7C0%7C0%7C638030704547579424%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C3000%7C%7C%7C&sdata=Lxc1yNMV5PkcMiweMavAGgm3Vp7Yu8hqk0w79cj9vYg%3D&reserved=0>



We would also like to remind you that the previous lectures are available on the youtube channel of the seminar:

https://www.youtube.com/channel/UCN0o3PUqaC_ZhPNuM846kgg/<https://eur03.safelinks.protection.outlook.com/?url=https%3A%2F%2Fwww.youtube.com%2Fchannel%2FUCN0o3PUqaC_ZhPNuM846kgg%2F&data=05%7C01%7Cf.pasquotto%40math.leidenuniv.nl%7C4938465b710f4073cf6308dabd8b9bbe%7Cca2a7f76dbd74ec091086b3d524fb7c8%7C0%7C0%7C638030704547579424%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C3000%7C%7C%7C&sdata=%2BARMEjR8Enc7vBZrgpDUcW62uuP96I0CTuY1r8LaX2A%3D&reserved=0>



We hope to see many of you on Friday!



Alvaro, Federica, Rob, and Thomas.



Abstract:

I will give an introduction to Steenrod squares and the classical Hopf invariant one problem. Then I will talk about a generalisation of the classical theorem that orientable manifolds have even Euler characteristic unless the dimension is a multiple of 4. This generalization to higher orientable manifolds leads to a new open problem that extends the Hopf invariant one problem.

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