{"id":4711,"date":"2015-09-13T16:48:40","date_gmt":"2015-09-13T14:48:40","guid":{"rendered":"https:\/\/wpethzprd.ethz.ch\/kowalski\/?p=4711"},"modified":"2024-02-20T13:40:33","modified_gmt":"2024-02-20T11:40:33","slug":"ventotene","status":"publish","type":"post","link":"https:\/\/blogs.ethz.ch\/kowalski\/2015\/09\/13\/ventotene\/","title":{"rendered":"Ventotene"},"content":{"rendered":"<p>I just came back from a week on the Italian island of <a href=\"https:\/\/en.wikipedia.org\/wiki\/Ventotene\">Ventotene<\/a>, where I participated in a very nice <a href=\"https:\/\/www.ventoteneinternationalworkshops.net\/ventotene-2015\/\">conference on &#8220;Manifolds and groups&#8221;<\/a>. This is of course not my usual topic, and besides giving a minicourse on expanders and coverings (with a focus on geometric applications of expanders having to do with coverings&#8230;), I learnt a lot of interesting things. I particularly enjoyed the other two minicourses, by T. Gelander on invariant random subgroups and by R. Sauer on L\u00fccks&#8217;s Approximation Theorem. (For both of these, as well as for a number of other talks, the slides are available on the conference web page; my own &#8212; handwritten &#8212; notes on my course should appear there soon, after I scan them).<\/p>\n<p>Being an island, Ventotene is reached by boat. One of the interesting things about the trip to Ventotene was to observe how birds<\/p>\n<figure id=\"attachment_4713\" aria-describedby=\"caption-attachment-4713\" style=\"width: 300px\" class=\"wp-caption aligncenter\"><a href=\"https:\/\/blogs.ethz.ch\/kowalski\/files\/2015\/09\/DSCN7092.jpg\"><img loading=\"lazy\" decoding=\"async\" class=\"size-medium wp-image-4713\" src=\"https:\/\/blogs.ethz.ch\/kowalski\/files\/2015\/09\/DSCN7092-300x225.jpg\" alt=\"Birds\" width=\"300\" height=\"225\" srcset=\"https:\/\/blogs.ethz.ch\/kowalski\/files\/2015\/09\/DSCN7092-300x225.jpg 300w, https:\/\/blogs.ethz.ch\/kowalski\/files\/2015\/09\/DSCN7092-1024x768.jpg 1024w, https:\/\/blogs.ethz.ch\/kowalski\/files\/2015\/09\/DSCN7092-400x300.jpg 400w, https:\/\/blogs.ethz.ch\/kowalski\/files\/2015\/09\/DSCN7092.jpg 1459w\" sizes=\"auto, (max-width: 300px) 100vw, 300px\" \/><\/a><figcaption id=\"caption-attachment-4713\" class=\"wp-caption-text\">Birds<\/figcaption><\/figure>\n<p>would follow us until a very definite point, and then suddenly disappear.<\/p>\n<p>Also, the instructions to launch a lifeboat are rather daunting&#8230;<\/p>\n<figure id=\"attachment_4714\" aria-describedby=\"caption-attachment-4714\" style=\"width: 225px\" class=\"wp-caption aligncenter\"><a href=\"https:\/\/blogs.ethz.ch\/kowalski\/files\/2015\/09\/DSCN7102-e1442155449929.jpg\"><img loading=\"lazy\" decoding=\"async\" class=\"size-medium wp-image-4714\" src=\"https:\/\/blogs.ethz.ch\/kowalski\/files\/2015\/09\/DSCN7102-e1442155449929-225x300.jpg\" alt=\"Lifeboat\" width=\"225\" height=\"300\" srcset=\"https:\/\/blogs.ethz.ch\/kowalski\/files\/2015\/09\/DSCN7102-e1442155449929-225x300.jpg 225w, https:\/\/blogs.ethz.ch\/kowalski\/files\/2015\/09\/DSCN7102-e1442155449929-768x1024.jpg 768w, https:\/\/blogs.ethz.ch\/kowalski\/files\/2015\/09\/DSCN7102-e1442155449929-400x533.jpg 400w, https:\/\/blogs.ethz.ch\/kowalski\/files\/2015\/09\/DSCN7102-e1442155449929.jpg 1094w\" sizes=\"auto, (max-width: 225px) 100vw, 225px\" \/><\/a><figcaption id=\"caption-attachment-4714\" class=\"wp-caption-text\">Lifeboat<\/figcaption><\/figure>\n<p>The organizers had scheduled a lot of free time during the conference besides the scientific programme. I was therefore able to take a few pictures, such as some of the local lizards,<\/p>\n<figure id=\"attachment_4715\" aria-describedby=\"caption-attachment-4715\" style=\"width: 300px\" class=\"wp-caption aligncenter\"><a href=\"https:\/\/blogs.ethz.ch\/kowalski\/files\/2015\/09\/DSCN7161.jpg\"><img loading=\"lazy\" decoding=\"async\" class=\"size-medium wp-image-4715\" src=\"https:\/\/blogs.ethz.ch\/kowalski\/files\/2015\/09\/DSCN7161-300x225.jpg\" alt=\"Lizard\" width=\"300\" height=\"225\" srcset=\"https:\/\/blogs.ethz.ch\/kowalski\/files\/2015\/09\/DSCN7161-300x225.jpg 300w, https:\/\/blogs.ethz.ch\/kowalski\/files\/2015\/09\/DSCN7161-1024x768.jpg 1024w, https:\/\/blogs.ethz.ch\/kowalski\/files\/2015\/09\/DSCN7161-400x300.jpg 400w, https:\/\/blogs.ethz.ch\/kowalski\/files\/2015\/09\/DSCN7161.jpg 1459w\" sizes=\"auto, (max-width: 300px) 100vw, 300px\" \/><\/a><figcaption id=\"caption-attachment-4715\" class=\"wp-caption-text\">Lizard<\/figcaption><\/figure>\n<p>and some of the wonderful local cats.<\/p>\n<figure id=\"attachment_4716\" aria-describedby=\"caption-attachment-4716\" style=\"width: 225px\" class=\"wp-caption aligncenter\"><a href=\"https:\/\/blogs.ethz.ch\/kowalski\/files\/2015\/09\/DSCN7216-e1442155437204.jpg\"><img loading=\"lazy\" decoding=\"async\" class=\"size-medium wp-image-4716\" src=\"https:\/\/blogs.ethz.ch\/kowalski\/files\/2015\/09\/DSCN7216-e1442155437204-225x300.jpg\" alt=\"Cat\" width=\"225\" height=\"300\" srcset=\"https:\/\/blogs.ethz.ch\/kowalski\/files\/2015\/09\/DSCN7216-e1442155437204-225x300.jpg 225w, https:\/\/blogs.ethz.ch\/kowalski\/files\/2015\/09\/DSCN7216-e1442155437204-768x1024.jpg 768w, https:\/\/blogs.ethz.ch\/kowalski\/files\/2015\/09\/DSCN7216-e1442155437204-400x533.jpg 400w, https:\/\/blogs.ethz.ch\/kowalski\/files\/2015\/09\/DSCN7216-e1442155437204.jpg 1094w\" sizes=\"auto, (max-width: 225px) 100vw, 225px\" \/><\/a><figcaption id=\"caption-attachment-4716\" class=\"wp-caption-text\">Cat<\/figcaption><\/figure>\n<p>The end of the week also coincided with the beginning of the ten-day long celebration of the island&#8217;s patron saint, <a href=\"https:\/\/it.wikipedia.org\/wiki\/Santa_Candida\">Santa Candida<\/a>. Among the festivities were the evening launches<\/p>\n<figure id=\"attachment_4717\" aria-describedby=\"caption-attachment-4717\" style=\"width: 225px\" class=\"wp-caption aligncenter\"><a href=\"https:\/\/blogs.ethz.ch\/kowalski\/files\/2015\/09\/DSCN7200-e1442155398977.jpg\"><img loading=\"lazy\" decoding=\"async\" class=\"size-medium wp-image-4717\" src=\"https:\/\/blogs.ethz.ch\/kowalski\/files\/2015\/09\/DSCN7200-e1442155398977-225x300.jpg\" alt=\"Balloon\" width=\"225\" height=\"300\" srcset=\"https:\/\/blogs.ethz.ch\/kowalski\/files\/2015\/09\/DSCN7200-e1442155398977-225x300.jpg 225w, https:\/\/blogs.ethz.ch\/kowalski\/files\/2015\/09\/DSCN7200-e1442155398977-768x1024.jpg 768w, https:\/\/blogs.ethz.ch\/kowalski\/files\/2015\/09\/DSCN7200-e1442155398977-400x533.jpg 400w, https:\/\/blogs.ethz.ch\/kowalski\/files\/2015\/09\/DSCN7200-e1442155398977.jpg 1536w\" sizes=\"auto, (max-width: 225px) 100vw, 225px\" \/><\/a><figcaption id=\"caption-attachment-4717\" class=\"wp-caption-text\">Balloon<\/figcaption><\/figure>\n<p>(over a week) of huge hot-air balloons (&#8220;Mongolfieri&#8221;), with some fireworks<\/p>\n<figure id=\"attachment_4718\" aria-describedby=\"caption-attachment-4718\" style=\"width: 300px\" class=\"wp-caption aligncenter\"><a href=\"https:\/\/blogs.ethz.ch\/kowalski\/files\/2015\/09\/DSCN7193.jpg\"><img loading=\"lazy\" decoding=\"async\" class=\"size-medium wp-image-4718\" src=\"https:\/\/blogs.ethz.ch\/kowalski\/files\/2015\/09\/DSCN7193-300x225.jpg\" alt=\"Fireworks\" width=\"300\" height=\"225\" srcset=\"https:\/\/blogs.ethz.ch\/kowalski\/files\/2015\/09\/DSCN7193-300x225.jpg 300w, https:\/\/blogs.ethz.ch\/kowalski\/files\/2015\/09\/DSCN7193-1024x768.jpg 1024w, https:\/\/blogs.ethz.ch\/kowalski\/files\/2015\/09\/DSCN7193-400x300.jpg 400w, https:\/\/blogs.ethz.ch\/kowalski\/files\/2015\/09\/DSCN7193.jpg 1459w\" sizes=\"auto, (max-width: 300px) 100vw, 300px\" \/><\/a><figcaption id=\"caption-attachment-4718\" class=\"wp-caption-text\">Fireworks<\/figcaption><\/figure>\n<p>(note the amusing effects of my camera&#8217;s fireworks scene setting without tripod&#8230;). Some <a href=\"https:\/\/galoisrepresentations.wordpress.com\/\">Galois-theoretic persiflage<\/a> was also notable&#8230;<\/p>\n<figure id=\"attachment_4719\" aria-describedby=\"caption-attachment-4719\" style=\"width: 300px\" class=\"wp-caption aligncenter\"><a href=\"https:\/\/blogs.ethz.ch\/kowalski\/files\/2015\/09\/DSCN7203.jpg\"><img loading=\"lazy\" decoding=\"async\" class=\"size-medium wp-image-4719\" src=\"https:\/\/blogs.ethz.ch\/kowalski\/files\/2015\/09\/DSCN7203-300x225.jpg\" alt=\"Persiflage\" width=\"300\" height=\"225\" srcset=\"https:\/\/blogs.ethz.ch\/kowalski\/files\/2015\/09\/DSCN7203-300x225.jpg 300w, https:\/\/blogs.ethz.ch\/kowalski\/files\/2015\/09\/DSCN7203-1024x768.jpg 1024w, https:\/\/blogs.ethz.ch\/kowalski\/files\/2015\/09\/DSCN7203-400x300.jpg 400w, https:\/\/blogs.ethz.ch\/kowalski\/files\/2015\/09\/DSCN7203.jpg 2048w\" sizes=\"auto, (max-width: 300px) 100vw, 300px\" \/><\/a><figcaption id=\"caption-attachment-4719\" class=\"wp-caption-text\">Persiflage<\/figcaption><\/figure>\n<p><b>Update<\/b> The scans of my lectures can be found <a href=\"https:\/\/polybox.ethz.ch\/public.php?service=files&amp;t=1b1dc59b66df6e714c899781ab3e7e67\">here<\/a>.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>I just came back from a week on the Italian island of Ventotene, where I participated in a very nice conference on &#8220;Manifolds and groups&#8221;. This is of course not my usual topic, and besides giving a minicourse on expanders and coverings (with a focus on geometric applications of expanders having to do with coverings&#8230;), &hellip; <a href=\"https:\/\/blogs.ethz.ch\/kowalski\/2015\/09\/13\/ventotene\/\" class=\"more-link\">Continue reading <span class=\"screen-reader-text\">Ventotene<\/span><\/a><\/p>\n","protected":false},"author":625,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[157,2,113],"tags":[],"class_list":["post-4711","post","type-post","status-publish","format-standard","hentry","category-eth","category-blogroll","category-travel"],"_links":{"self":[{"href":"https:\/\/blogs.ethz.ch\/kowalski\/wp-json\/wp\/v2\/posts\/4711","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/blogs.ethz.ch\/kowalski\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/blogs.ethz.ch\/kowalski\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/blogs.ethz.ch\/kowalski\/wp-json\/wp\/v2\/users\/625"}],"replies":[{"embeddable":true,"href":"https:\/\/blogs.ethz.ch\/kowalski\/wp-json\/wp\/v2\/comments?post=4711"}],"version-history":[{"count":0,"href":"https:\/\/blogs.ethz.ch\/kowalski\/wp-json\/wp\/v2\/posts\/4711\/revisions"}],"wp:attachment":[{"href":"https:\/\/blogs.ethz.ch\/kowalski\/wp-json\/wp\/v2\/media?parent=4711"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/blogs.ethz.ch\/kowalski\/wp-json\/wp\/v2\/categories?post=4711"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/blogs.ethz.ch\/kowalski\/wp-json\/wp\/v2\/tags?post=4711"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}