Speaker: Alex Lubotzky (Weizmann Institute & the Hebrew University, Simons Distinguished Visiting Professor, MIT)Title: High Dimensional Expanders (HDX) and their applications in pure math and computer scienceAbstract:Expander graphs have been an intensive topic of research in math and CS during the last six decades. In the last two decades a high dimensional theory has emerged with (very different) applications in math & CS.In this series of 8 independent (but related) lectures we present some aspects of the theory of HDX and its applications, a number of open problems and suggestions for further research.A more detailed plan:1. Thursday 2/20/25, 4:30pm, 2-190 (Math Colloquium); refreshments served at 4pm in 2-290  Introduction: three main problems(a) Gromov overlapping property(b) Locally testable codes(c) Are all groups sofic?2. Tuesday 2/25/25, 4:15-5:15pm, 32-G449 (Theory of Computing Colloquium), refreshments served at 4pmGood Locally testable codes3. Wednesday 2/26/25, 9:30-11am, 2-449Expander graphs: combinatorics, spectral gap, representation theory(Kazhdan property (T), property (\tau) and more) and property testing4. Wednesday 3/5/25, 9:30-11am, 2-449Geometric & topological expanders, Coboundary expanders, Random simplicial complexes and Property testing5. Wednesday 3/12/25, 9:30-11am, 2-449From Ramanujan graphs to Ramanujan complexes6. Wednesday 3/19/25, 9:30-11am, 2-449Stability and group approximation, Garland Theorem and the p-adic Deligne central extensionsWednesday 3/26/25 - Spring vacation7. Wednesday 4/2/26, 9:30-11am, 2-449Some more CS: Agreement tests, direct product test; PCP8. Wednesday 4/9/25, 9:30-11am, 2-449Are there non-sofic groups? The Aldous-Lyons conjecture and more

Sun Ra, Parliament-Funkadelic, George Clinton, Erykah Badu, Octavia E. Butler, Digable Planets, Janelle Monae, Flying Lotus, Grace Jones, Missy Elliott, and moreA new exhibit in Lewis Music Library celebrates the visionary contributions of Afrofuturist artists across various genres and mediums. From the cosmic jazz of Sun Ra and the psychedelic funk of Parliament-Funkadelic and George Clinton, to the neo-soul of Erykah Badu and the sci-fi narratives of Octavia E. Butler, these artists have pushed the boundaries of creativity and imagination.This event is presented as part of Artfinity: A celebration of creativity and community at MIT.

Hidden within MIT’s Distinctive Collections, many architectural elements from the earliest days of the Institute’s architecture program still survive as part of the Rotch Art Collection. Among the artworks that conservators salvaged was a set of striking windows of gypsum and stained-glass, dating to the late 18th- to 19th c. Ottoman Empire. This exhibition illuminates the life of these historic windows, tracing their refracted histories from Egypt to MIT, their ongoing conservation, and the cutting-edge research they still prompt.The Maihaugen Gallery (14N-130) is open Monday through Thursday, 10am - 4pm, excluding Institute holidays.

Join a member of our Visitor Experience Team for this 45-minute introductory tour of the MIT Museum. Learn about the collection, our history, and get your questions answered by our gallery experts. Space is limited, please speak to a visitor experience representative at the admission desk when purchasing museum tickets if you would like to participate in the tour.Every Wednesday at 11am Free with museum admission

If you need extra time to work on your writing projects this spring, join in-person Writing Together Retreats. These structured writing sessions are designed to help you make progress on your projects while being productive with the peer support of other students and scholars. Additionally, some sessions will feature MIT Librarians, who will be available to provide advice.This program is open to all MIT students, postdocs, faculty, and staff who are actively writing papers, proposals, manuscripts, or thesis chapters.All sessions will take place on Wednesdays. We will provide lunch, drinks, and a conducive ambiance for writing.NOTE: These sessions are co-sponsored by the Writing and Communication Center, MIT Libraries, the Office of Graduate Education, and the Graduate Student Council.