<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
</head>
<body dir="auto">
<div dir="ltr"></div>
<div dir="ltr">Dear all,</div>
<div dir="ltr"><br>
</div>
<div dir="ltr">Please see the announcement below.</div>
<div dir="ltr"><br>
</div>
<div dir="ltr">Best,</div>
<div dir="ltr">Thomas<br>
<br>
<br>
Begin forwarded message:<br>
<br>
</div>
<blockquote type="cite">
<div dir="ltr">
<div class="elementToProof" style="font-family: Aptos, Aptos_EmbeddedFont, Aptos_MSFontService, Calibri, Helvetica, sans-serif; font-size: 12pt; color: rgb(0, 0, 0);">
<br>
</div>
<div class="elementToProof" style="font-family: Aptos, Aptos_EmbeddedFont, Aptos_MSFontService, Calibri, Helvetica, sans-serif; font-size: 12pt; color: rgb(0, 0, 0);">
<br>
</div>
<div dir="ltr" id="divRplyFwdMsg"></div>
<div>———</div>
<p style="margin: 0in;"><span style="font-family: Aptos, sans-serif; font-size: 14.666667px;"><img alt="Women in Math - Eva Miranda - QR.jpg" src="cid:0FA377E8-0891-4923-8314-CB8446B0B982"></span><span style="font-family: Aptos, sans-serif; font-size: 11pt;"> </span></p>
<p style="margin: 0in; font-family: Aptos, sans-serif; font-size: 12pt;"><span style="font-size: 11pt;"><br>
</span></p>
<p style="margin: 0in;"><span style="font-family: Aptos, sans-serif; font-size: 11pt;">This year is the
<b>70th birthday of the Mathematical Institute</b> and<b> the 450th birthday of Leiden University.
</b>On </span><span style="font-family: Aptos, sans-serif; font-size: 14.666667px;">these</span><span style="font-family: Aptos, sans-serif; font-size: 11pt;"> occasions, we will celebrate
<b>Women in Mathematics Day</b> on <b>12 May</b> with the public lecture</span></p>
<p style="margin: 0in;"><br>
</p>
<p style="margin: 0in;"><span style="font-family: Aptos, sans-serif; font-size: 18px;"><b>Certainty in Uncertain Times</b></span></p>
<p style="margin: 0in;"><span style="font-family: Aptos, sans-serif; font-size: 11pt;"><br>
</span></p>
<p style="margin: 0in;"><span style="font-family: Aptos, sans-serif; font-size: 11pt;"> by Prof.Dr.
</span><b><a href="https://web.mat.upc.edu/eva.miranda/nova/" id="OWA41560e2c-f74e-fdaf-6a74-4144e62635eb" class="OWAAutoLink" originalsrc="https://web.mat.upc.edu/eva.miranda/nova/" data-auth="NotApplicable" style="margin-top: 0px; margin-bottom: 0px;">Eva
Miranda</a></b><span style="font-family: Aptos, sans-serif; font-size: 11pt;"> (UPC, Barcelona) </span></p>
<p style="margin: 0in;"><br>
</p>
<p style="margin: 0in;">Abstract is below.</p>
<p style="margin: 0in; font-family: Aptos, sans-serif; font-size: 12pt;"><span style="font-size: 11pt;"> </span></p>
<p style="margin: 0in; font-family: Aptos, sans-serif; font-size: 12pt;"><span style="font-size: 11pt;"><b>Programme</b></span></p>
<p style="margin: 0in; font-family: Aptos, sans-serif; font-size: 12pt;"><span style="font-size: 11pt;">17.00: Take a seat in CM1.26<br>
17.15: Public lecture “Certainty in Uncertain Times“</span></p>
<p style="margin: 0in; font-family: Aptos, sans-serif; font-size: 12pt;"><span style="font-size: 11pt;">18.15: Drinks @ De Fusie</span></p>
<p style="margin: 0in; font-family: Aptos, sans-serif; font-size: 12pt;"><span style="font-size: 11pt;"> </span></p>
<p style="margin: 0in;"><span style="font-family: Aptos, sans-serif; font-size: 11pt;">We are looking forward to see many from
</span><span style="font-family: Aptos, sans-serif; font-size: 14.666667px;">the</span><span style="font-family: Aptos, sans-serif; font-size: 11pt;"> Faculty.</span></p>
<p style="margin: 0in; font-family: Aptos, sans-serif; font-size: 12pt;"><span style="font-size: 11pt;"> </span></p>
<p style="margin: 0in; font-family: Aptos, sans-serif; font-size: 12pt;"><span style="font-size: 11pt;">More information can be found here:</span></p>
<p style="margin: 0in; font-family: Aptos, sans-serif; font-size: 12pt;"><span style="font-size: 11pt; color: rgb(70, 120, 134);"><a href="https://www.universiteitleiden.nl/en/events/2025/04/women-in-mathematics-2025-public-lecture" id="OWA3fc0ca72-a160-0a3d-013a-58205bc9f4b6" class="OWAAutoLink" originalsrc="https://www.universiteitleiden.nl/en/events/2025/04/women-in-mathematics-2025-public-lecture" data-auth="NotApplicable" style="color: rgb(70, 120, 134); margin-top: 0px; margin-bottom: 0px;">https://www.universiteitleiden.nl/en/events/2025/04/women-in-mathematics-2025-public-lecture</a></span></p>
<p style="margin: 0in; font-family: Aptos, sans-serif; font-size: 12pt;"><span style="font-size: 11pt;"> </span></p>
<p style="margin: 0in; font-family: Aptos, sans-serif; font-size: 12pt;"><span style="font-size: 11pt;">We hope to see you there!</span></p>
<p style="margin: 0in; font-family: Aptos, sans-serif; font-size: 12pt;"><span style="font-size: 11pt;"><br>
</span></p>
<p style="margin: 0in;"><span style="font-family: Aptos, sans-serif; font-size: 14.666667px;">———</span></p>
<h2 style="line-height: 1.375; margin: 0px; color: rgb(0, 17, 88);"><span style="font-size: 14px;">Abstract</span></h2>
<p style="margin: 0px 0px 24px; color: rgb(51, 51, 51);">Will the 2024 YR4 asteroid strike Earth? Science’s answer: highly unlikely. While there’s a faint chance it could make a dramatic arrival on Christmas Eve 2032, the probability remains extremely low.
Despite our reliance on mathematics and physics for precise predictions, history warns us that certainty is elusive.</p>
<p style="margin: 0px 0px 24px; color: rgb(51, 51, 51);">At the dawn of the 20th century, David Hilbert envisioned a world where uncertainty would be conquered by pure reason. But as the century unfolded, this dream unraveled. Alan Turing laid the foundations
of modern computing and logic with his proof of the undecidability of the halting problem, revealing an uncomfortable truth: some questions are inherently unanswerable.<br>
<br>
Chaos theory warns us that even the slightest imprecision in measurement can spiral into wildly unpredictable outcomes over time. This classical chaos appears in celestial mechanics, where we discover a universe far less predictable than Newton had imagined.
Modern chaos theory, reveals that deterministic systems—such as planetary motion—can exhibit extreme sensitivity to initial conditions, making long-term predictions practically impossible.<br>
<br>
But beyond classical chaos lies something even more unsettling—logical chaos. Some systems are not just sensitive to initial conditions but fundamentally undecidable. In 2021, in collaboration with Robert Cardona, Daniel Peralta-Salas, and Francisco Presas,
I proved the existence of undecidable fluid paths—trajectories so complex that no logical framework can determine whether they will ever reach a given region. And what of the cosmos? Could similar undecidable phenomena exist in celestial mechanics? Are there
cosmic events so complex that no theory, no supercomputer will ever decipher them?</p>
<h2 style="line-height: 1.375; margin: 0px; color: rgb(0, 17, 88);"><span style="font-size: 14px;">About the speaker</span></h2>
<p style="margin: 0px 0px 24px; color: rgb(51, 51, 51);">Eva Miranda is a Full Professor at UPC and a leading expert in Differential Geometry, Mathematical Physics, and Dynamical Systems. Recognised with two consecutive ICREA Academia Awards (2016, 2021), she
has also received prestigious honours such as the François Deruyts Prize from the Royal Academy of Belgium and the Bessel Prize from the Alexander von Humboldt Foundation. In 2023, she was named the London Mathematical Society Hardy Lecturer, delivering a
nine-stop lecture tour across the UK.</p>
<p style="margin: 0px 0px 24px; color: rgb(51, 51, 51);">Currently the director of the Laboratory of Geometry and Dynamical Systems and leader of the GEOMVAP research group, Prof. Miranda has recently co-founded the SYMCREA excellence unit. Her research spans
Symplectic and Poisson Geometry, Hamiltonian Dynamics, and Geometric Quantization, with a focus on b-Poisson manifolds and their applications in Celestial Mechanics and Fluid Dynamics. </p>
<p style="margin: 0px 0px 24px; color: rgb(51, 51, 51);">In 2025, Prof. Miranda will hold distinguished positions as the Gauss Professor at the University of Göttingen and Nachdiplom Lecturer at ETH Zurich.</p>
</div>
</blockquote>
</body>
</html>