https://en.maistrelis.com/Personal blog of Kostas Maistrelis.enKostas MaistrelisKostas MaistrelisMon, 22 Jun 2026 00:13:16 +0300https://en.maistrelis.com/posts/postgresql_greece_meetup_event_2/Mon, 22 Jun 2026 00:13:16 +0300Kostas Maistrelishttps://en.maistrelis.com/posts/postgresql_greece_meetup_event_2/<p><a href="https://en.maistrelis.com/posts/postgresql_greece_meetup_event_2/" style="float:right; margin:0 0 8px 14px;"><img src="https://en.maistrelis.com/posts/postgresql_greece_meetup_event_2/media/1780478714792.jpeg" width="180"></a> On 5 June 2026 the second meetup of the <a href="https://en.maistrelis.com/items/postgresql_greece_meetup/">Greece PostgreSQL User Group</a> took place.</p> <p>I had the pleasure of taking part as a speaker, presenting &ldquo;PostgreSQL &amp; Tree Structures&rdquo;.</p> <p>You can view the presentation here: <a href="https://maistrelis.com/postgresql/postgresql_tree_structures/main.html#/title-slide">PostgreSQL &amp; Tree Structures</a></p>https://en.maistrelis.com/articles/i-kanoniki-katanomi-kai-i-proeleysi-tis/Mon, 23 Feb 2015 21:32:16 +0200Kostas Maistrelishttps://en.maistrelis.com/articles/i-kanoniki-katanomi-kai-i-proeleysi-tis/<div style="float:right;margin:0 0 6px 10px;"><img alt="normal_distribution" width="190" src="https://en.maistrelis.com/articles/i-kanoniki-katanomi-kai-i-proeleysi-tis/media/normal_distro1.png"></div> <p>Quite a few statistics and probability textbooks with an introduction to the normal distribution have passed through my hands. They almost always started with the mathematical definition and moved on to the properties and uses of the distribution. For a long time I had not found a book that explained how this formula came about — until at some point a book called Lady Luck fell into my hands which, although old, is a very good introduction to the subject of probability, and in it I found the first clear description of how the normal distribution arises.</p>