<div dir="ltr"><div class="gmail_quote"><br><div dir="ltr"><div class="gmail_quote"><div dir="ltr"><div class="gmail_quote"><div dir="ltr"><div><p class="MsoNormal" style="margin:0cm 0cm 10pt;line-height:115%;font-size:11pt;font-family:Calibri,"sans-serif""><br></p>

<p class="MsoNormal" style="margin:0cm 0cm 10pt;line-height:115%;font-size:11pt;font-family:Calibri,"sans-serif""><span lang="EN-US" style="font-size:12pt;line-height:115%">Dear colleagues, </span></p>

<p class="MsoNormal" style="margin:0cm 0cm 0.0001pt;text-align:justify;line-height:normal;font-size:11pt;font-family:Calibri,"sans-serif""><span lang="EN-US" style="font-size:12pt">Our next
seminar will be held on Monday, <b>April 24</b>,<b> </b>from <b>3 p.m. to 4 p.m</b>. (Rio de Janeiro
local time). This meeting</span><span lang="EN-US" style="font-size:12pt;color:rgb(51,51,51)"> will take place on Zoom, through the link below: </span></p>

<p class="MsoNormal" style="margin:0cm 0cm 0.0001pt;text-align:justify;line-height:normal;font-size:11pt;font-family:Calibri,"sans-serif""><span lang="EN-US" style="font-size:12pt;color:rgb(51,51,51)"> </span></p>

<p class="MsoNormal" style="margin:0cm 0cm 0.0001pt;text-align:justify;line-height:normal;font-size:11pt;font-family:Calibri,"sans-serif""><a href="https://us02web.zoom.us/j/87114243701?pwd=TDB3Sm9jUGpEcmpnVFdLdURkTGZ4QT09" style="color:blue" target="_blank"><span lang="EN-US" style="font-size:12pt;color:rgb(17,85,204);background-image:initial;background-position:initial;background-size:initial;background-repeat:initial;background-origin:initial;background-clip:initial">https://us02web.zoom.us/j/87114243701?pwd=TDB3Sm9jUGpEcmpnVFdLdURkTGZ4QT09</span></a><span lang="EN-US" style="font-size:12pt;color:rgb(51,51,51)"> </span><span lang="EN-US" style="font-size:12pt"> </span><span lang="EN-US" style="font-size:12pt"></span></p>

<p class="MsoNormal" style="line-height:12.65pt;background-image:initial;background-position:initial;background-size:initial;background-repeat:initial;background-origin:initial;background-clip:initial;margin:0cm 0cm 10pt;font-size:11pt;font-family:Calibri,"sans-serif""><span lang="DE" style="font-size:12pt"> </span></p>

<p class="MsoNormal" style="margin:0cm 0cm 0.0001pt;line-height:normal;font-size:11pt;font-family:Calibri,"sans-serif""><span style="font-size:12pt">Speaker: </span><b><span style="font-size:12pt">Zoraida Fernandez Rico (Columbia) </span></b></p>

<p class="MsoNormal" style="margin:0cm 0cm 10pt;line-height:115%;font-size:11pt;font-family:Calibri,"sans-serif""><b><span style="font-size:12pt;line-height:115%"> </span></b></p>

<p class="MsoNormal" style="margin:0cm 0cm 10pt;line-height:115%;font-size:11pt;font-family:Calibri,"sans-serif""><span lang="EN-US" style="font-size:12pt;line-height:115%">Title: </span><span lang="EN-US" style="font-size:12pt;line-height:115%">Fine bounds on covariance estimation</span><span lang="EN-US" style="font-size:12pt;line-height:115%"></span></p>

<p class="MsoNormal" style="margin:0cm 0cm 10pt;line-height:115%;font-size:11pt;font-family:Calibri,"sans-serif""><span lang="EN-US" style="font-size:12pt;line-height:115%">Abstract: </span><span lang="EN-US" style="font-size:12pt;line-height:115%">We present an estimator of the covariance
matrix of a random d-dimensional vector from an i.i.d. finite sample. Our only
assumption is that this vector satisfies a bounded L^p-L^2 marginal moment for
p greater or equal than 4, and we allow an adversary to modify arbitrary a
fraction of the sample. Given this, we show that the covariance can be
estimated with the same high-probability error rates that the sample covariance
matrix achieves in the case of Gaussian data. This talk is based on a joint
work with Roberto I. Oliveira (IMPA). </span><span lang="EN-US" style="font-size:12pt;line-height:115%;background-image:initial;background-position:initial;background-size:initial;background-repeat:initial;background-origin:initial;background-clip:initial"></span></p>

<p class="MsoNormal" style="line-height:115%;font-size:11pt;font-family:Calibri,"sans-serif""><span lang="EN-US" style="font-size:12pt;line-height:115%">All the talks are held in
English.</span><span lang="EN-US" style="font-size:12pt;line-height:115%"></span></p>

<p class="MsoNormal" style="margin:0cm 0cm 10pt;line-height:115%;font-size:11pt;font-family:Calibri,"sans-serif""><span lang="EN-US" style="font-size:12pt;line-height:115%">More complete information
about the seminars can be found at</span></p>

<p class="MsoNormal" style="margin:0cm 0cm 10pt;line-height:115%;font-size:11pt;font-family:Calibri,"sans-serif""><a href="http://www.dme.ufrj.br/?page_id=3355" style="color:blue" target="_blank"><span lang="EN-US" style="font-size:12pt;line-height:115%;color:rgb(17,85,204);background-image:initial;background-position:initial;background-size:initial;background-repeat:initial;background-origin:initial;background-clip:initial">http://www.dme.ufrj.br/?page_id=3355</span></a><span lang="EN-US" style="font-size:12pt;line-height:115%"></span></p>

<p class="MsoNormal" style="margin:0cm 0cm 10pt;line-height:115%;font-size:11pt;font-family:Calibri,"sans-serif""><span style="font-size:12pt;line-height:115%">Sincerely, </span></p>

<p class="MsoNormal" style="margin:0cm 0cm 10pt;line-height:115%;font-size:11pt;font-family:Calibri,"sans-serif""><span style="font-size:12pt;line-height:115%">Organizers: Giulio Iacobelli e Maria Eulalia Vares</span></p></div></div>
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