## Scientific General Events

Linear Algebra and its Applications

*Patrik Guggenberger*:On the Asymptotic Size Distortion of Tests When Instruments Locally Violate the Exogeneity Assumption

*Shinichi Sakata*:Instrumental Variables Estimation and Weak-Identification-Robust Inference Based on Conditional Quantile Restriction

A journey from the Mobius strip, though affine Kac-Moody and superconformal algebras, to children's drawings.

Abstract: One of the most recurrent themes in both Physics and Mathematics, is the study and construction of objects that locally look the same. I will explain, mainly via examples and in non-technical terms, how the concept of "locally look the same" has evolved through time (mostly through some beautiful ideas of Serre and of Grothendieck).