<?xml version="1.0" encoding="UTF-8"?><rss version="2.0" xmlns:content="http://purl.org/rss/1.0/modules/content/"><channel><title>Igor Vigasin</title><description>Notes and essays by Igor Vigasin.</description><link>https://vigasin.com/</link><language>en</language><item><title>Hello, world</title><link>https://vigasin.com/en/posts/hello-world/</link><guid isPermaLink="true">https://vigasin.com/en/posts/hello-world/</guid><description>Why this blog exists, and a quick check that code, math and footnotes render.</description><pubDate>Thu, 01 Oct 2026 00:00:00 GMT</pubDate><content:encoded>&lt;p&gt;This is the first post here. It mostly exists to prove that everything renders.&lt;/p&gt;
&lt;h2 id=&quot;code&quot;&gt;Code&lt;/h2&gt;
&lt;pre class=&quot;astro-code astro-code-themes github-light github-dark-dimmed&quot; style=&quot;background-color:#fff;--shiki-dark-bg:#22272e;color:#24292e;--shiki-dark:#adbac7; overflow-x: auto;&quot; tabindex=&quot;0&quot; data-language=&quot;ts&quot;&gt;&lt;code&gt;&lt;span class=&quot;line&quot;&gt;&lt;span style=&quot;color:#D73A49;--shiki-dark:#F47067&quot;&gt;export&lt;/span&gt;&lt;span style=&quot;color:#D73A49;--shiki-dark:#F47067&quot;&gt; function&lt;/span&gt;&lt;span style=&quot;color:#6F42C1;--shiki-dark:#DCBDFB&quot;&gt; greet&lt;/span&gt;&lt;span style=&quot;color:#24292E;--shiki-dark:#ADBAC7&quot;&gt;(&lt;/span&gt;&lt;span style=&quot;color:#E36209;--shiki-dark:#F69D50&quot;&gt;name&lt;/span&gt;&lt;span style=&quot;color:#D73A49;--shiki-dark:#F47067&quot;&gt;:&lt;/span&gt;&lt;span style=&quot;color:#005CC5;--shiki-dark:#6CB6FF&quot;&gt; string&lt;/span&gt;&lt;span style=&quot;color:#24292E;--shiki-dark:#ADBAC7&quot;&gt;)&lt;/span&gt;&lt;span style=&quot;color:#D73A49;--shiki-dark:#F47067&quot;&gt;:&lt;/span&gt;&lt;span style=&quot;color:#005CC5;--shiki-dark:#6CB6FF&quot;&gt; string&lt;/span&gt;&lt;span style=&quot;color:#24292E;--shiki-dark:#ADBAC7&quot;&gt; {&lt;/span&gt;&lt;/span&gt;
&lt;span class=&quot;line&quot;&gt;&lt;span style=&quot;color:#D73A49;--shiki-dark:#F47067&quot;&gt;  return&lt;/span&gt;&lt;span style=&quot;color:#032F62;--shiki-dark:#96D0FF&quot;&gt; `Hello, ${&lt;/span&gt;&lt;span style=&quot;color:#24292E;--shiki-dark:#ADBAC7&quot;&gt;name&lt;/span&gt;&lt;span style=&quot;color:#032F62;--shiki-dark:#96D0FF&quot;&gt;}!`&lt;/span&gt;&lt;span style=&quot;color:#24292E;--shiki-dark:#ADBAC7&quot;&gt;;&lt;/span&gt;&lt;/span&gt;
&lt;span class=&quot;line&quot;&gt;&lt;span style=&quot;color:#24292E;--shiki-dark:#ADBAC7&quot;&gt;}&lt;/span&gt;&lt;/span&gt;&lt;/code&gt;&lt;/pre&gt;
&lt;h2 id=&quot;math&quot;&gt;Math&lt;/h2&gt;
&lt;p&gt;The area of a circle is &lt;span class=&quot;katex&quot;&gt;&lt;span class=&quot;katex-mathml&quot;&gt;&lt;math xmlns=&quot;http://www.w3.org/1998/Math/MathML&quot;&gt;&lt;semantics&gt;&lt;mrow&gt;&lt;mi&gt;A&lt;/mi&gt;&lt;mo&gt;=&lt;/mo&gt;&lt;mi&gt;π&lt;/mi&gt;&lt;msup&gt;&lt;mi&gt;r&lt;/mi&gt;&lt;mn&gt;2&lt;/mn&gt;&lt;/msup&gt;&lt;/mrow&gt;&lt;annotation encoding=&quot;application/x-tex&quot;&gt;A = \pi r^2&lt;/annotation&gt;&lt;/semantics&gt;&lt;/math&gt;&lt;/span&gt;&lt;span class=&quot;katex-html&quot; aria-hidden=&quot;true&quot;&gt;&lt;span class=&quot;katex-base&quot;&gt;&lt;span class=&quot;katex-strut&quot; style=&quot;height:0.6833em;&quot;&gt;&lt;/span&gt;&lt;span class=&quot;mord mathnormal&quot;&gt;A&lt;/span&gt;&lt;span class=&quot;mspace&quot; style=&quot;margin-right:0.2778em;&quot;&gt;&lt;/span&gt;&lt;span class=&quot;mrel&quot;&gt;=&lt;/span&gt;&lt;span class=&quot;mspace&quot; style=&quot;margin-right:0.2778em;&quot;&gt;&lt;/span&gt;&lt;/span&gt;&lt;span class=&quot;katex-base&quot;&gt;&lt;span class=&quot;katex-strut&quot; style=&quot;height:0.8141em;&quot;&gt;&lt;/span&gt;&lt;span class=&quot;mord mathnormal&quot; style=&quot;margin-right:0.0359em;&quot;&gt;π&lt;/span&gt;&lt;span class=&quot;mord&quot;&gt;&lt;span class=&quot;mord mathnormal&quot; style=&quot;margin-right:0.0278em;&quot;&gt;r&lt;/span&gt;&lt;span class=&quot;msupsub&quot;&gt;&lt;span class=&quot;vlist-t&quot;&gt;&lt;span class=&quot;vlist-r&quot;&gt;&lt;span class=&quot;vlist&quot; style=&quot;height:0.8141em;&quot;&gt;&lt;span style=&quot;top:-3.063em;margin-right:0.05em;&quot;&gt;&lt;span class=&quot;pstrut&quot; style=&quot;height:2.7em;&quot;&gt;&lt;/span&gt;&lt;span class=&quot;katex-sizing reset-size6 size3 mtight&quot;&gt;&lt;span class=&quot;mord mtight&quot;&gt;2&lt;/span&gt;&lt;/span&gt;&lt;/span&gt;&lt;/span&gt;&lt;/span&gt;&lt;/span&gt;&lt;/span&gt;&lt;/span&gt;&lt;/span&gt;&lt;/span&gt;&lt;/span&gt;. A definite integral:&lt;/p&gt;
&lt;span class=&quot;katex-display&quot;&gt;&lt;span class=&quot;katex&quot;&gt;&lt;span class=&quot;katex-mathml&quot;&gt;&lt;math xmlns=&quot;http://www.w3.org/1998/Math/MathML&quot; display=&quot;block&quot;&gt;&lt;semantics&gt;&lt;mrow&gt;&lt;msubsup&gt;&lt;mo&gt;∫&lt;/mo&gt;&lt;mn&gt;0&lt;/mn&gt;&lt;mn&gt;1&lt;/mn&gt;&lt;/msubsup&gt;&lt;msup&gt;&lt;mi&gt;x&lt;/mi&gt;&lt;mn&gt;2&lt;/mn&gt;&lt;/msup&gt;&lt;mtext&gt; &lt;/mtext&gt;&lt;mi&gt;d&lt;/mi&gt;&lt;mi&gt;x&lt;/mi&gt;&lt;mo&gt;=&lt;/mo&gt;&lt;mfrac&gt;&lt;mn&gt;1&lt;/mn&gt;&lt;mn&gt;3&lt;/mn&gt;&lt;/mfrac&gt;&lt;/mrow&gt;&lt;annotation encoding=&quot;application/x-tex&quot;&gt;\int_0^1 x^2 \, dx = \frac{1}{3}&lt;/annotation&gt;&lt;/semantics&gt;&lt;/math&gt;&lt;/span&gt;&lt;span class=&quot;katex-html&quot; aria-hidden=&quot;true&quot;&gt;&lt;span class=&quot;katex-base&quot;&gt;&lt;span class=&quot;katex-strut&quot; style=&quot;height:2.476em;vertical-align:-0.9119em;&quot;&gt;&lt;/span&gt;&lt;span class=&quot;mop&quot;&gt;&lt;span class=&quot;mop op-symbol large-op&quot; style=&quot;margin-right:0.4445em;position:relative;top:-0.0011em;&quot;&gt;∫&lt;/span&gt;&lt;span class=&quot;msupsub&quot;&gt;&lt;span class=&quot;vlist-t vlist-t2&quot;&gt;&lt;span class=&quot;vlist-r&quot;&gt;&lt;span class=&quot;vlist&quot; style=&quot;height:1.564em;&quot;&gt;&lt;span style=&quot;top:-1.7881em;margin-left:-0.4445em;margin-right:0.05em;&quot;&gt;&lt;span class=&quot;pstrut&quot; style=&quot;height:2.7em;&quot;&gt;&lt;/span&gt;&lt;span class=&quot;katex-sizing reset-size6 size3 mtight&quot;&gt;&lt;span class=&quot;mord mtight&quot;&gt;0&lt;/span&gt;&lt;/span&gt;&lt;/span&gt;&lt;span style=&quot;top:-3.8129em;margin-right:0.05em;&quot;&gt;&lt;span class=&quot;pstrut&quot; style=&quot;height:2.7em;&quot;&gt;&lt;/span&gt;&lt;span class=&quot;katex-sizing reset-size6 size3 mtight&quot;&gt;&lt;span class=&quot;mord mtight&quot;&gt;1&lt;/span&gt;&lt;/span&gt;&lt;/span&gt;&lt;/span&gt;&lt;span class=&quot;vlist-s&quot;&gt;​&lt;/span&gt;&lt;/span&gt;&lt;span class=&quot;vlist-r&quot;&gt;&lt;span class=&quot;vlist&quot; style=&quot;height:0.9119em;&quot;&gt;&lt;span&gt;&lt;/span&gt;&lt;/span&gt;&lt;/span&gt;&lt;/span&gt;&lt;/span&gt;&lt;/span&gt;&lt;span class=&quot;mspace&quot; style=&quot;margin-right:0.1667em;&quot;&gt;&lt;/span&gt;&lt;span class=&quot;mord&quot;&gt;&lt;span class=&quot;mord mathnormal&quot;&gt;x&lt;/span&gt;&lt;span class=&quot;msupsub&quot;&gt;&lt;span class=&quot;vlist-t&quot;&gt;&lt;span class=&quot;vlist-r&quot;&gt;&lt;span class=&quot;vlist&quot; style=&quot;height:0.8641em;&quot;&gt;&lt;span style=&quot;top:-3.113em;margin-right:0.05em;&quot;&gt;&lt;span class=&quot;pstrut&quot; style=&quot;height:2.7em;&quot;&gt;&lt;/span&gt;&lt;span class=&quot;katex-sizing reset-size6 size3 mtight&quot;&gt;&lt;span class=&quot;mord mtight&quot;&gt;2&lt;/span&gt;&lt;/span&gt;&lt;/span&gt;&lt;/span&gt;&lt;/span&gt;&lt;/span&gt;&lt;/span&gt;&lt;/span&gt;&lt;span class=&quot;mspace&quot; style=&quot;margin-right:0.1667em;&quot;&gt;&lt;/span&gt;&lt;span class=&quot;mord mathnormal&quot;&gt;d&lt;/span&gt;&lt;span class=&quot;mord mathnormal&quot;&gt;x&lt;/span&gt;&lt;span class=&quot;mspace&quot; style=&quot;margin-right:0.2778em;&quot;&gt;&lt;/span&gt;&lt;span class=&quot;mrel&quot;&gt;=&lt;/span&gt;&lt;span class=&quot;mspace&quot; style=&quot;margin-right:0.2778em;&quot;&gt;&lt;/span&gt;&lt;/span&gt;&lt;span class=&quot;katex-base&quot;&gt;&lt;span class=&quot;katex-strut&quot; style=&quot;height:2.0074em;vertical-align:-0.686em;&quot;&gt;&lt;/span&gt;&lt;span class=&quot;mord&quot;&gt;&lt;span class=&quot;mopen nulldelimiter&quot;&gt;&lt;/span&gt;&lt;span class=&quot;mfrac&quot;&gt;&lt;span class=&quot;vlist-t vlist-t2&quot;&gt;&lt;span class=&quot;vlist-r&quot;&gt;&lt;span class=&quot;vlist&quot; style=&quot;height:1.3214em;&quot;&gt;&lt;span style=&quot;top:-2.314em;&quot;&gt;&lt;span class=&quot;pstrut&quot; style=&quot;height:3em;&quot;&gt;&lt;/span&gt;&lt;span class=&quot;mord&quot;&gt;&lt;span class=&quot;mord&quot;&gt;3&lt;/span&gt;&lt;/span&gt;&lt;/span&gt;&lt;span style=&quot;top:-3.23em;&quot;&gt;&lt;span class=&quot;pstrut&quot; style=&quot;height:3em;&quot;&gt;&lt;/span&gt;&lt;span class=&quot;frac-line&quot; style=&quot;border-bottom-width:0.04em;&quot;&gt;&lt;/span&gt;&lt;/span&gt;&lt;span style=&quot;top:-3.677em;&quot;&gt;&lt;span class=&quot;pstrut&quot; style=&quot;height:3em;&quot;&gt;&lt;/span&gt;&lt;span class=&quot;mord&quot;&gt;&lt;span class=&quot;mord&quot;&gt;1&lt;/span&gt;&lt;/span&gt;&lt;/span&gt;&lt;/span&gt;&lt;span class=&quot;vlist-s&quot;&gt;​&lt;/span&gt;&lt;/span&gt;&lt;span class=&quot;vlist-r&quot;&gt;&lt;span class=&quot;vlist&quot; style=&quot;height:0.686em;&quot;&gt;&lt;span&gt;&lt;/span&gt;&lt;/span&gt;&lt;/span&gt;&lt;/span&gt;&lt;/span&gt;&lt;span class=&quot;mclose nulldelimiter&quot;&gt;&lt;/span&gt;&lt;/span&gt;&lt;/span&gt;&lt;/span&gt;&lt;/span&gt;&lt;/span&gt;
&lt;h2 id=&quot;footnotes&quot;&gt;Footnotes&lt;/h2&gt;
&lt;p&gt;Footnotes work too.&lt;sup&gt;&lt;a href=&quot;#user-content-fn-1&quot; id=&quot;user-content-fnref-1&quot; data-footnote-ref aria-describedby=&quot;footnote-label&quot;&gt;1&lt;/a&gt;&lt;/sup&gt;&lt;/p&gt;
&lt;section data-footnotes class=&quot;footnotes&quot;&gt;&lt;h2 class=&quot;sr-only&quot; id=&quot;footnote-label&quot;&gt;Footnotes&lt;/h2&gt;
&lt;ol&gt;
&lt;li id=&quot;user-content-fn-1&quot;&gt;
&lt;p&gt;Like this one. &lt;a href=&quot;#user-content-fnref-1&quot; data-footnote-backref=&quot;&quot; aria-label=&quot;Back to reference 1&quot; class=&quot;data-footnote-backref&quot;&gt;↩&lt;/a&gt;&lt;/p&gt;
&lt;/li&gt;
&lt;/ol&gt;
&lt;/section&gt;
</content:encoded></item><item><title>Why I write in Markdown</title><link>https://vigasin.com/en/posts/why-markdown/</link><guid isPermaLink="true">https://vigasin.com/en/posts/why-markdown/</guid><description>Plain text files, version control, and no editor lock-in.</description><pubDate>Wed, 30 Sep 2026 00:00:00 GMT</pubDate><content:encoded>&lt;p&gt;Every post on this site is a plain Markdown file in a git repository. Writing happens in
any editor, history comes for free, and publishing is a &lt;code&gt;git push&lt;/code&gt;.&lt;/p&gt;
&lt;p&gt;This post has no Russian translation, so the language switcher is hidden here.&lt;/p&gt;
</content:encoded></item></channel></rss>