Department of

# Mathematics

Seminar Calendar
for events the day of Monday, October 13, 2014.

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events for the
events containing

Questions regarding events or the calendar should be directed to Tori Corkery.
    September 2014          October 2014          November 2014
Su Mo Tu We Th Fr Sa   Su Mo Tu We Th Fr Sa   Su Mo Tu We Th Fr Sa
1  2  3  4  5  6             1  2  3  4                      1
7  8  9 10 11 12 13    5  6  7  8  9 10 11    2  3  4  5  6  7  8
14 15 16 17 18 19 20   12 13 14 15 16 17 18    9 10 11 12 13 14 15
21 22 23 24 25 26 27   19 20 21 22 23 24 25   16 17 18 19 20 21 22
28 29 30               26 27 28 29 30 31      23 24 25 26 27 28 29
30


Monday, October 13, 2014

3:00 pm in 341 Altgeld Hall,Monday, October 13, 2014

#### The Hofer length spectrum of symplectic surfaces

###### Michael Khanevsky (U Chicago Math)

Abstract: In Riemannian geometry the length spectrum is a rich source of invariants of the manifold. In the symplectic setting there is no notion of length, hence no possibility to define the length spectrum. Frederic Le Roux proposed the following construction: pick a ball of a fixed radius and translate it by a Hamiltonian isotopy along a given homotopy (or homology) class. The minimal Hofer energy required for such translation behaves in a very similar way to the Riemannian length spectrum. We will discuss some estimates for this energy in the two-dimensional case.

4:00 pm in 243 Altgeld Hall,Monday, October 13, 2014

#### Fun with Power Operations

###### Peter Nelson (UIUC Math)

Abstract: Let E be an E-infinity ring...- wait, what does that even mean? What sort of structures does it give on homotopy? On the cohomology theory the spectrum represents? What do we win from this? What does it look like in practice? I'll address at least some of these questions, and hope to not make you more confused.

5:00 pm in 141 Altgeld Hall,Monday, October 13, 2014

#### Fourier multiplier on noncommutative L_p

###### Adrian Gonzalez (ICMAT Spain )

Abstract: We will prove results on Fourier multiplier on L_p(LG) where LG is the von Neumann algebra of a topological group using two Laplacians.