<rss version="2.0" xmlns:dc="http://purl.org/dc/elements/1.1/" xmlns:atom="http://www.w3.org/2005/Atom"><channel><title>Hacker News: lefra</title><link>https://news.ycombinator.com/user?id=lefra</link><description>Hacker News RSS</description><docs>https://hnrss.org/</docs><generator>hnrss v2.1.1</generator><lastBuildDate>Thu, 14 May 2026 14:20:31 +0000</lastBuildDate><atom:link href="https://hnrss.org/user?id=lefra" rel="self" type="application/rss+xml"></atom:link><item><title><![CDATA[New comment by lefra in "Extraordinary Ordinals"]]></title><description><![CDATA[
<p>What about big T, square/angle brackets, and braces?</p>
]]></description><pubDate>Thu, 14 May 2026 07:41:19 +0000</pubDate><link>https://news.ycombinator.com/item?id=48132265</link><dc:creator>lefra</dc:creator><comments>https://news.ycombinator.com/item?id=48132265</comments><guid isPermaLink="false">https://news.ycombinator.com/item?id=48132265</guid></item><item><title><![CDATA[New comment by lefra in "Extraordinary Ordinals"]]></title><description><![CDATA[
<p>I think I lack context to see what this is about. The line graphs are pretty though, and I'd like to understand more.</p>
]]></description><pubDate>Thu, 14 May 2026 07:36:58 +0000</pubDate><link>https://news.ycombinator.com/item?id=48132240</link><dc:creator>lefra</dc:creator><comments>https://news.ycombinator.com/item?id=48132240</comments><guid isPermaLink="false">https://news.ycombinator.com/item?id=48132240</guid></item><item><title><![CDATA[New comment by lefra in "I moved my digital stack to Europe"]]></title><description><![CDATA[
<p>A french with low exposure to english would pronounce "ChatGPT" with the first "t" silent, and it sounds exactly like "Cat, I farted" in french.</p>
]]></description><pubDate>Wed, 13 May 2026 16:44:18 +0000</pubDate><link>https://news.ycombinator.com/item?id=48124308</link><dc:creator>lefra</dc:creator><comments>https://news.ycombinator.com/item?id=48124308</comments><guid isPermaLink="false">https://news.ycombinator.com/item?id=48124308</guid></item><item><title><![CDATA[New comment by lefra in "Show HN: Rust but Lisp"]]></title><description><![CDATA[
<p>> ((. dx powf 2.0) + (. dy powf 2.0)) sqrt))<p>I don't know what this is, but clearly not Lisp...</p>
]]></description><pubDate>Sun, 10 May 2026 06:38:47 +0000</pubDate><link>https://news.ycombinator.com/item?id=48081544</link><dc:creator>lefra</dc:creator><comments>https://news.ycombinator.com/item?id=48081544</comments><guid isPermaLink="false">https://news.ycombinator.com/item?id=48081544</guid></item><item><title><![CDATA[New comment by lefra in "Can I disable all data collection from my vehicle?"]]></title><description><![CDATA[
<p>A GPS receiver is passive, it doesn't send any signal to the satellites. The satellite broadcast their position and what time it is from their point of view, and the receiver computes its position from that.<p>Also, there are now several countries that sent positioning constellations (obviously to not have to rely on the US for positioning), and most receivers support several: GPS (US), Galileo (Europe), Glonass (Russia), Beidu (China).</p>
]]></description><pubDate>Fri, 01 May 2026 07:16:13 +0000</pubDate><link>https://news.ycombinator.com/item?id=47972044</link><dc:creator>lefra</dc:creator><comments>https://news.ycombinator.com/item?id=47972044</comments><guid isPermaLink="false">https://news.ycombinator.com/item?id=47972044</guid></item><item><title><![CDATA[New comment by lefra in "How I leared what a decoupling capacitor is for, the hard way"]]></title><description><![CDATA[
<p>You can't, because all amplifiers oscillate (except when you need an oscillator).</p>
]]></description><pubDate>Tue, 28 Apr 2026 15:41:29 +0000</pubDate><link>https://news.ycombinator.com/item?id=47936061</link><dc:creator>lefra</dc:creator><comments>https://news.ycombinator.com/item?id=47936061</comments><guid isPermaLink="false">https://news.ycombinator.com/item?id=47936061</guid></item><item><title><![CDATA[New comment by lefra in "How I leared what a decoupling capacitor is for, the hard way"]]></title><description><![CDATA[
<p>My university made us use really crappy power supplies and dev boards. Nothing worked unless you first put a large bulk capacitor on the power supply's output, and small capacitors close to the components.<p>Also I got bitten by parasitics in capacitors very early in my career: capacitors of different face value will resonate with each other to effectively kill the decoupling network at a specific frequency (resulting, for me, in an amplifier with a nice hole in its frequency response).</p>
]]></description><pubDate>Tue, 28 Apr 2026 07:06:59 +0000</pubDate><link>https://news.ycombinator.com/item?id=47931274</link><dc:creator>lefra</dc:creator><comments>https://news.ycombinator.com/item?id=47931274</comments><guid isPermaLink="false">https://news.ycombinator.com/item?id=47931274</guid></item><item><title><![CDATA[New comment by lefra in "How I leared what a decoupling capacitor is for, the hard way"]]></title><description><![CDATA[
<p>For approximative simulation, any SPICE simulator works. You'll need to know your capacitors parasitics and power supply output impedance, find a typical via's impedance, and manually compute traces impedances and board capacitance.<p>For accurate simulation, the actual board geometry needs to be fed to a simulator that'll compute the actual impedances. Last I checked only Very Expensive Software could do that in a user-friendly way (I had to route a DDR3 bus. I ended up being very cautious so that all traces had the same topology and the same lengths, and cross my fingers. It worked).<p>If anyone knows of free alternatives for that, I'd be interested to hear about it.</p>
]]></description><pubDate>Tue, 28 Apr 2026 06:54:52 +0000</pubDate><link>https://news.ycombinator.com/item?id=47931213</link><dc:creator>lefra</dc:creator><comments>https://news.ycombinator.com/item?id=47931213</comments><guid isPermaLink="false">https://news.ycombinator.com/item?id=47931213</guid></item><item><title><![CDATA[New comment by lefra in "Mahjong: A Visual Guide"]]></title><description><![CDATA[
<p>> Every fan doubles your base points<p>Did I miss it, or are the "base points" never explained?</p>
]]></description><pubDate>Sun, 26 Apr 2026 06:09:05 +0000</pubDate><link>https://news.ycombinator.com/item?id=47907805</link><dc:creator>lefra</dc:creator><comments>https://news.ycombinator.com/item?id=47907805</comments><guid isPermaLink="false">https://news.ycombinator.com/item?id=47907805</guid></item><item><title><![CDATA[New comment by lefra in "NIST scientists create 'any wavelength' lasers"]]></title><description><![CDATA[
<p>Fibers are not transparent enough in visible. I found about 10dB/km (to be compared with 0.2 dB/km around 1550nm) [0]. This means that after every km the light intensity is divided by 10, which is completely impractical for telecommunications.<p>[0] <a href="https://media.thorlabs.com/globalassets/family-pages/sharedassets/s/sm/sm_fluoride_fiber_attenuation_comparison_g1-780.gif?v=1117010007" rel="nofollow">https://media.thorlabs.com/globalassets/family-pages/shareda...</a></p>
]]></description><pubDate>Sun, 19 Apr 2026 07:09:08 +0000</pubDate><link>https://news.ycombinator.com/item?id=47822366</link><dc:creator>lefra</dc:creator><comments>https://news.ycombinator.com/item?id=47822366</comments><guid isPermaLink="false">https://news.ycombinator.com/item?id=47822366</guid></item><item><title><![CDATA[New comment by lefra in "Is math big or small?"]]></title><description><![CDATA[
<p>A first-year physics teacher once told the class something that stuck with me (paraphrasing): "Nothing is big or small by itself. I want you to always follow these words with 'compared to ...'".</p>
]]></description><pubDate>Mon, 13 Apr 2026 08:27:42 +0000</pubDate><link>https://news.ycombinator.com/item?id=47749299</link><dc:creator>lefra</dc:creator><comments>https://news.ycombinator.com/item?id=47749299</comments><guid isPermaLink="false">https://news.ycombinator.com/item?id=47749299</guid></item><item><title><![CDATA[New comment by lefra in "My MacBook keyboard is broken and it's insanely expensive to fix"]]></title><description><![CDATA[
<p>I bought this kind of insurance for my PhD (Dell laptop, same 24 hours technician on site guarantee). Although quite expensive, I don't regret it: my screen and motherboard got replaced about two years in.</p>
]]></description><pubDate>Mon, 30 Mar 2026 15:09:55 +0000</pubDate><link>https://news.ycombinator.com/item?id=47575315</link><dc:creator>lefra</dc:creator><comments>https://news.ycombinator.com/item?id=47575315</comments><guid isPermaLink="false">https://news.ycombinator.com/item?id=47575315</guid></item><item><title><![CDATA[New comment by lefra in "The road signs that teach travellers about France"]]></title><description><![CDATA[
<p>People merging have right of way only on the parisian périphérique. On all other motorways in France, the merging cars must yield.<p>It is common courtesy to move over or match speed so they can merge more easily, but that's not the law.</p>
]]></description><pubDate>Mon, 30 Mar 2026 04:42:57 +0000</pubDate><link>https://news.ycombinator.com/item?id=47570452</link><dc:creator>lefra</dc:creator><comments>https://news.ycombinator.com/item?id=47570452</comments><guid isPermaLink="false">https://news.ycombinator.com/item?id=47570452</guid></item><item><title><![CDATA[New comment by lefra in "South Korea Mandates Solar Panels for Public Parking Lots"]]></title><description><![CDATA[
<p>I'm the perfect client for an electric car (I can charge at home, and 99% of my trips are less than 100km). I want one even.<p>I still use my old ICE though, because the price of vehicles went through the roof those last years, which means the money I saved to replace it only gets me 60% of a car.<p>My point is telling or convincing people is not enough. The desired outcome must be oviously practical and  cheaper.</p>
]]></description><pubDate>Sun, 29 Mar 2026 07:45:46 +0000</pubDate><link>https://news.ycombinator.com/item?id=47561161</link><dc:creator>lefra</dc:creator><comments>https://news.ycombinator.com/item?id=47561161</comments><guid isPermaLink="false">https://news.ycombinator.com/item?id=47561161</guid></item><item><title><![CDATA[New comment by lefra in "Comparing Python Type Checkers: Typing Spec Conformance"]]></title><description><![CDATA[
<p>In C, int may be as small as 16 bits You may get 32 bits (or more) but it's not guaranteed. I don't see how you get a memory overflow though?<p>I'd be surprised if a compiler with -Wall -Werror accepts to compile this.<p>Trying to cast back the int to a char* might work if the pointers are the same size as int on the target platform, but it's actually Undefined Behaviour IIRC.</p>
]]></description><pubDate>Mon, 16 Mar 2026 18:24:15 +0000</pubDate><link>https://news.ycombinator.com/item?id=47402789</link><dc:creator>lefra</dc:creator><comments>https://news.ycombinator.com/item?id=47402789</comments><guid isPermaLink="false">https://news.ycombinator.com/item?id=47402789</guid></item><item><title><![CDATA[New comment by lefra in "NASA's DART spacecraft changed an asteroid's orbit around the sun"]]></title><description><![CDATA[
<p>Yes, it's one multiplication in both cases.<p>Multiplying/dividing by 1 million is way easier than by 86400 though.</p>
]]></description><pubDate>Fri, 13 Mar 2026 05:57:17 +0000</pubDate><link>https://news.ycombinator.com/item?id=47361137</link><dc:creator>lefra</dc:creator><comments>https://news.ycombinator.com/item?id=47361137</comments><guid isPermaLink="false">https://news.ycombinator.com/item?id=47361137</guid></item><item><title><![CDATA[New comment by lefra in "Swiss e-voting pilot can't count 2,048 ballots after decryption failure"]]></title><description><![CDATA[
<p>There's a trivial solution to this: IDs should be provided by the government for free.</p>
]]></description><pubDate>Wed, 11 Mar 2026 21:29:30 +0000</pubDate><link>https://news.ycombinator.com/item?id=47342235</link><dc:creator>lefra</dc:creator><comments>https://news.ycombinator.com/item?id=47342235</comments><guid isPermaLink="false">https://news.ycombinator.com/item?id=47342235</guid></item><item><title><![CDATA[New comment by lefra in "From RGB to L*a*b* color space (2024)"]]></title><description><![CDATA[
<p>No need for ML. This already exists, the keyword to look for is "spectral rendering".<p>To add to the general thread: the diverse color spaces are there to answer questions that inherently involve how a typical human sees colors, so they _have_ to include biology, that's their whole point. For example:<p>- I want objects of a specific color (because of branding), how to communicate that to contractors, and how to check it?<p>- What's a correct processing chain from capturing an image to display/print, that guarantees that the image will look the same on all devices?</p>
]]></description><pubDate>Sun, 08 Mar 2026 15:26:18 +0000</pubDate><link>https://news.ycombinator.com/item?id=47298086</link><dc:creator>lefra</dc:creator><comments>https://news.ycombinator.com/item?id=47298086</comments><guid isPermaLink="false">https://news.ycombinator.com/item?id=47298086</guid></item><item><title><![CDATA[New comment by lefra in "How far back in time can you understand English?"]]></title><description><![CDATA[
<p>As an ESL I'd say it depends on the native language of who's speaking. I'll have no trouble with a thick spanish, italian or romanian language (I'm french), but indians speaking english are completely incomprehensible to me.</p>
]]></description><pubDate>Sun, 22 Feb 2026 08:22:50 +0000</pubDate><link>https://news.ycombinator.com/item?id=47109327</link><dc:creator>lefra</dc:creator><comments>https://news.ycombinator.com/item?id=47109327</comments><guid isPermaLink="false">https://news.ycombinator.com/item?id=47109327</guid></item><item><title><![CDATA[New comment by lefra in "Meta Deployed AI and It Is Killing Our Agency"]]></title><description><![CDATA[
<p>Undefined Behavior</p>
]]></description><pubDate>Sat, 21 Feb 2026 08:02:58 +0000</pubDate><link>https://news.ycombinator.com/item?id=47098550</link><dc:creator>lefra</dc:creator><comments>https://news.ycombinator.com/item?id=47098550</comments><guid isPermaLink="false">https://news.ycombinator.com/item?id=47098550</guid></item></channel></rss>