<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: xpe</title><link>https://news.ycombinator.com/user?id=xpe</link><description>Hacker News RSS</description><docs>https://hnrss.org/</docs><generator>hnrss v2.1.1</generator><lastBuildDate>Fri, 17 Apr 2026 09:46:39 +0000</lastBuildDate><atom:link href="https://hnrss.org/user?id=xpe" rel="self" type="application/rss+xml"></atom:link><item><title><![CDATA[New comment by xpe in "Claude Opus 4.7"]]></title><description><![CDATA[
<p>Think about all the possible explanations carefully. Weight them based on the best information you have.<p>(I think the most likely explanation for Mythos is that it's asymmetrically a very big deal. Come to your own conclusions, but don't simply fall back on the "oh this fits the hype pattern" thought terminating cliché.)<p>Also be aware of what you want to see. If you want the world to fit your narrative, you're more likely construct explanations for that. (In my friend group at least, I feel like most fall prey to this, at least some of the time, including myself. These people are successful and intelligent by most measures.)<p>Then make a plan to become more disciplined about thinking clearly and probabilistically. Make it a system, not just something you do sometimes. I recommend the book "the Scout Mindset".<p>Concretely, if one hasn't spent a couple of quality hours really studying AI safety I think one is probably missing out. Dan Hendrycks has a great book.</p>
]]></description><pubDate>Thu, 16 Apr 2026 21:35:37 +0000</pubDate><link>https://news.ycombinator.com/item?id=47799798</link><dc:creator>xpe</dc:creator><comments>https://news.ycombinator.com/item?id=47799798</comments><guid isPermaLink="false">https://news.ycombinator.com/item?id=47799798</guid></item><item><title><![CDATA[New comment by xpe in "All elementary functions from a single binary operator"]]></title><description><![CDATA[
<p>Thanks for sharing that! Carry on :)</p>
]]></description><pubDate>Mon, 13 Apr 2026 21:18:20 +0000</pubDate><link>https://news.ycombinator.com/item?id=47757948</link><dc:creator>xpe</dc:creator><comments>https://news.ycombinator.com/item?id=47757948</comments><guid isPermaLink="false">https://news.ycombinator.com/item?id=47757948</guid></item><item><title><![CDATA[New comment by xpe in "All elementary functions from a single binary operator"]]></title><description><![CDATA[
<p>A quick meta-take here: it is hard to assess the level of expertise here on HN. Some might be just tangentially interested, other might have degrees in the specific topic. Others might maintain a scientific computing library. Domains vary too: embedded systems, robotics, spacecraft navigation, materials modeling, or physics simulation. Until/unless people step up and fill the gaps somehow, we have little notion of identity nor credentialing, for better and for worse.*<p>So it really helps when people explain (1) their context** and (2) their reasoning. Communicating well is harder than people think. Many comments are read by hundreds or more (thousands?) of people, most of whom probably have no idea who we are, what we know, or what we do with our brains on a regular basis. It is generous and considerate to other people to slow down and really explain where we're coming from.<p>So, when I read "most people use Taylor approximations"...<p>1. my first question is "on what basis can someone say this?"<p>2. for what domains might this somewhat true? False?<p>3. but the bigger problem is that claims like the above don't <i>teach</i>. i.e. When do Taylor series methods fall short? Why? When are the other approaches more useful?<p>Here's my quick take... Taylor expansions tends to work well when you are close to the expansion point and the function is analytic. Taylor expansions work less well when these assumptions don't hold. More broadly they don't tend to give uniform accuracy across a range. So Taylor approximations are usually only local. Other methods (Padé, minimax, etc) are worth reaching for when other constraints matter.<p>* I think this is a huge area we're going to need to work on in the age where anyone can sound like an expert.<p>**  In the case above, does "comp. EM" mean "computational electromagnetics" or something else? The paper talks about "EML" so it makes me wonder if "EM" is a typo. All of these ambiguities add up and make it hard for people to understand each other.</p>
]]></description><pubDate>Mon, 13 Apr 2026 15:17:15 +0000</pubDate><link>https://news.ycombinator.com/item?id=47753256</link><dc:creator>xpe</dc:creator><comments>https://news.ycombinator.com/item?id=47753256</comments><guid isPermaLink="false">https://news.ycombinator.com/item?id=47753256</guid></item><item><title><![CDATA[New comment by xpe in "All elementary functions from a single binary operator"]]></title><description><![CDATA[
<p>What are some of your favorite sources to dig into this field as a whole?</p>
]]></description><pubDate>Mon, 13 Apr 2026 13:40:35 +0000</pubDate><link>https://news.ycombinator.com/item?id=47751820</link><dc:creator>xpe</dc:creator><comments>https://news.ycombinator.com/item?id=47751820</comments><guid isPermaLink="false">https://news.ycombinator.com/item?id=47751820</guid></item><item><title><![CDATA[New comment by xpe in "All elementary functions from a single binary operator"]]></title><description><![CDATA[
<p>> but there's a reason that all approximations are done using series of polynomials (taylor expansion).<p>"All" is a tall claim. Have a look at <a href="https://perso.ens-lyon.fr/jean-michel.muller/FP5.pdf" rel="nofollow">https://perso.ens-lyon.fr/jean-michel.muller/FP5.pdf</a> for example. Jump to slide 18:<p>> Forget about Taylor series<p>> Taylor series are local best approximations: they cannot compete on a whole interval.<p>There is no need to worry about "sh-tt-ng" on their result when there is so much to learn about other approximation techniques.</p>
]]></description><pubDate>Mon, 13 Apr 2026 04:38:27 +0000</pubDate><link>https://news.ycombinator.com/item?id=47747662</link><dc:creator>xpe</dc:creator><comments>https://news.ycombinator.com/item?id=47747662</comments><guid isPermaLink="false">https://news.ycombinator.com/item?id=47747662</guid></item><item><title><![CDATA[New comment by xpe in "Ask HN: Any interesting niche hobbies?"]]></title><description><![CDATA[
<p>> just look at voting results<p>"Just"? How would you build a predictive model that inferred aggregate individual qualities such as 
"% atheists" based on voting results? That would be a rather indirect and distorted path for estimation. There are better ways.</p>
]]></description><pubDate>Sun, 12 Apr 2026 21:46:23 +0000</pubDate><link>https://news.ycombinator.com/item?id=47744891</link><dc:creator>xpe</dc:creator><comments>https://news.ycombinator.com/item?id=47744891</comments><guid isPermaLink="false">https://news.ycombinator.com/item?id=47744891</guid></item><item><title><![CDATA[New comment by xpe in "Assessing Claude Mythos Preview's cybersecurity capabilities"]]></title><description><![CDATA[
<p>To be pedantic: construction with an interconnected complex set of durable goals is hard. The general rule is that optimization over a constrained space is expensive.<p>But standing up a house of cards is pretty cheap. Examples include: shell corporations, formulaic business plans, AI slop, surface-level conversation, color by numbers, tract housing, cravenly only appealing the base desires of people, & c. (This might be the first time I've connected the dots in this way -- and it explains my distaste for all those things.)<p>But "cheap" isn't necessarily insecure. Installing bollards around building entrances is relatively cheap insurance against vehicular attacks. So this is more complicated than it seems. "Fast" doesn't mean unsafe. Even "hastily created" software _could_ be (relatively) secure if it was highly constrained to provably hardened patterns. A big problem comes when attacking a cheap target builds capability for the attacker. In a way, this analogous to how viruses attack. Start with an easy target, hijack the cell machinery, multiply, repeat.<p>Maybe this formulation is accurate?: If you creates something beyond your ability to understand it, then get ready to get pwned. "Staying in one's lane" in this sense might be 'safe' at least narrowly speaking (unless an entire industry is operating in a state of delusion, which is arguably the case now.)</p>
]]></description><pubDate>Sat, 11 Apr 2026 14:20:31 +0000</pubDate><link>https://news.ycombinator.com/item?id=47730875</link><dc:creator>xpe</dc:creator><comments>https://news.ycombinator.com/item?id=47730875</comments><guid isPermaLink="false">https://news.ycombinator.com/item?id=47730875</guid></item><item><title><![CDATA[New comment by xpe in "Assessing Claude Mythos Preview's cybersecurity capabilities"]]></title><description><![CDATA[
<p>> As doom and gloom as things are generally, I do think things have gotten better.<p>The question isn't "are companies making some security improvements?". That's one-sided. The question is "are companies making security improvements FAST ENOUGH to deal with the increased risks?"</p>
]]></description><pubDate>Sat, 11 Apr 2026 14:13:26 +0000</pubDate><link>https://news.ycombinator.com/item?id=47730805</link><dc:creator>xpe</dc:creator><comments>https://news.ycombinator.com/item?id=47730805</comments><guid isPermaLink="false">https://news.ycombinator.com/item?id=47730805</guid></item><item><title><![CDATA[New comment by xpe in "Ask HN: Any interesting niche hobbies?"]]></title><description><![CDATA[
<p>> Quite soon these accusations will nearly always be accurate.<p>/headscratching They don't have to be, do they? It is possible that some people will build identity systems with norms that e.g. humans type with their own hands. These could become popular, at least conceivably, in certain areas. Hard to enforce for sure. And getting harder and harder to distinguish reliably.</p>
]]></description><pubDate>Thu, 09 Apr 2026 19:17:40 +0000</pubDate><link>https://news.ycombinator.com/item?id=47708419</link><dc:creator>xpe</dc:creator><comments>https://news.ycombinator.com/item?id=47708419</comments><guid isPermaLink="false">https://news.ycombinator.com/item?id=47708419</guid></item><item><title><![CDATA[New comment by xpe in "Ask HN: Any interesting niche hobbies?"]]></title><description><![CDATA[
<p>I thought it would be weird to replace (b) with something, so I decided to search for characters from other languages.</p>
]]></description><pubDate>Thu, 09 Apr 2026 19:14:49 +0000</pubDate><link>https://news.ycombinator.com/item?id=47708374</link><dc:creator>xpe</dc:creator><comments>https://news.ycombinator.com/item?id=47708374</comments><guid isPermaLink="false">https://news.ycombinator.com/item?id=47708374</guid></item><item><title><![CDATA[New comment by xpe in "LittleSnitch for Linux"]]></title><description><![CDATA[
<p>Reminds me about schools of thought on rates of change:<p><pre><code>  > ## Accelerating Change [One School]
  >
  > Our intuitions about change are linear; we expect roughly
  > as much change as has occurred in the past over our own
  > lifetimes. But technological change feeds on itself, and
  > therefore accelerates. Change today is faster than it was
  > 500 years ago, which in turn is faster than it was 5000
  > years ago. Our recent past is not a reliable guide to how
  > much change we should expect in the future.
  >
  > Strong claim: Technological change follows smooth curves, 
  > typically exponential. Therefore we can predict with fair
  > precision when new technologies will arrive, and when they
  > will cross key thresholds, like the creation of [AI].
  >
  > Advocates: Ray Kurzweil, Alvin Toffler(?), John Smart

  https://www.yudkowsky.net/singularity/schools</code></pre></p>
]]></description><pubDate>Thu, 09 Apr 2026 12:23:55 +0000</pubDate><link>https://news.ycombinator.com/item?id=47702765</link><dc:creator>xpe</dc:creator><comments>https://news.ycombinator.com/item?id=47702765</comments><guid isPermaLink="false">https://news.ycombinator.com/item?id=47702765</guid></item><item><title><![CDATA[New comment by xpe in "Show HN: Orange Juice – Small UX improvements that make HN easier to read"]]></title><description><![CDATA[
<p>What is the correct pronunciation of serde? Fight amongst yourselves. /s</p>
]]></description><pubDate>Thu, 09 Apr 2026 03:39:19 +0000</pubDate><link>https://news.ycombinator.com/item?id=47699026</link><dc:creator>xpe</dc:creator><comments>https://news.ycombinator.com/item?id=47699026</comments><guid isPermaLink="false">https://news.ycombinator.com/item?id=47699026</guid></item><item><title><![CDATA[New comment by xpe in "Ask HN: Any interesting niche hobbies?"]]></title><description><![CDATA[
<p>While there is often a "normal" (bell-curve fitting) distribution for individual factors, putting them together can be counter-intuitive.<p>> Even when considering just three dimensions, fewer than 5% of pilots were “average” in all. [1]<p>I would guess many/most people probably <i>think</i> they fall into either (1) the normal bucket or (変) the weird/fringe bucket. Either "I am pretty normal" or "I am an outsider". How many think "We're all fairly different once you cluster in any 3 interesting dimensions!"?<p>But people feel that dichotomy, which makes me think it is largely about perception relative to a dominant culture: the in-group versus out-group feeling. For example, atheists might feel like outsiders in many parts of the U.S., but less so in big cities and in other countries. In dense urban walkable cities (like NYC), people <i>see</i> diversity more directly and more often. Seeing a bunch of people is different than seeing a bunch of cars.<p>[1]: From "Curse of Dimensionality: Lessons from the U.S. Air Force Cockpit Design" by Maciej Nasinski (2025): <a href="https://polkas.github.io/posts/cursedim/" rel="nofollow">https://polkas.github.io/posts/cursedim/</a></p>
]]></description><pubDate>Wed, 08 Apr 2026 17:55:26 +0000</pubDate><link>https://news.ycombinator.com/item?id=47693833</link><dc:creator>xpe</dc:creator><comments>https://news.ycombinator.com/item?id=47693833</comments><guid isPermaLink="false">https://news.ycombinator.com/item?id=47693833</guid></item><item><title><![CDATA[New comment by xpe in "Ask HN: Any interesting niche hobbies?"]]></title><description><![CDATA[
<p>Invasive species removal, bird identification, trail running, mountain biking, audiobook listening while walking. All are best done out of doors. :P Most are teh opposite of the posture and brain patterns that intensive computer usage encourages.</p>
]]></description><pubDate>Wed, 08 Apr 2026 17:50:49 +0000</pubDate><link>https://news.ycombinator.com/item?id=47693767</link><dc:creator>xpe</dc:creator><comments>https://news.ycombinator.com/item?id=47693767</comments><guid isPermaLink="false">https://news.ycombinator.com/item?id=47693767</guid></item><item><title><![CDATA[New comment by xpe in "Show HN: Brutalist Concrete Laptop Stand (2024)"]]></title><description><![CDATA[
<p>Also known as an inertial mass dampener for your sit-stand desk.<p>I appreciate++ the design except for the too-perfect rebar and the exposed wire directly _in_ the concrete. Pros would use a conduit methinks.</p>
]]></description><pubDate>Tue, 07 Apr 2026 12:01:56 +0000</pubDate><link>https://news.ycombinator.com/item?id=47673886</link><dc:creator>xpe</dc:creator><comments>https://news.ycombinator.com/item?id=47673886</comments><guid isPermaLink="false">https://news.ycombinator.com/item?id=47673886</guid></item><item><title><![CDATA[New comment by xpe in "Ultraplan with Claude Code"]]></title><description><![CDATA[
<p>My one experience with Ultraplan has been not good. It took too long to figure out how to comment on the plan. The overall process feels sluggish to the point that I wonder "is this thing on?" I also don't understand the underlying mechanisms (when/how are files being shipped between my desktop Claude Code and Claude Code on the Web) which is not a feeling I like as a developer. I have thought about abandoning despite the slowness but I'm not sure what that would do.</p>
]]></description><pubDate>Sun, 05 Apr 2026 22:27:34 +0000</pubDate><link>https://news.ycombinator.com/item?id=47654593</link><dc:creator>xpe</dc:creator><comments>https://news.ycombinator.com/item?id=47654593</comments><guid isPermaLink="false">https://news.ycombinator.com/item?id=47654593</guid></item><item><title><![CDATA[New comment by xpe in "A Claude Code skill that makes Claude talk like a caveman, cutting token use"]]></title><description><![CDATA[
<p>Though the above exchange felt a tiny bit snarky, I think the conversation did get more interesting as it went on. I genuinely think both people could probably gain by talking more -- or at least figuring out a way to move fast the surface level differences. Yes, humans designed LLMs. But this doesn't mean we understand their implications even at this (relatively simple) level.</p>
]]></description><pubDate>Sun, 05 Apr 2026 15:23:02 +0000</pubDate><link>https://news.ycombinator.com/item?id=47650369</link><dc:creator>xpe</dc:creator><comments>https://news.ycombinator.com/item?id=47650369</comments><guid isPermaLink="false">https://news.ycombinator.com/item?id=47650369</guid></item><item><title><![CDATA[New comment by xpe in "Talk like caveman"]]></title><description><![CDATA[
<p>Unfrozen caveman lawyer here. Did "talk like caveman" make code more bad? Make unsubst... (AARG) FAKE claims? You deserve compen... AAARG ... money. AMA.</p>
]]></description><pubDate>Sun, 05 Apr 2026 13:37:12 +0000</pubDate><link>https://news.ycombinator.com/item?id=47649317</link><dc:creator>xpe</dc:creator><comments>https://news.ycombinator.com/item?id=47649317</comments><guid isPermaLink="false">https://news.ycombinator.com/item?id=47649317</guid></item><item><title><![CDATA[New comment by xpe in "A Claude Code skill that makes Claude talk like a caveman, cutting token use"]]></title><description><![CDATA[
<p>> Can't you know that tokens are units of thinking just by... like... thinking about how models work?<p>Seems reasonable, but this doesn't settle probably-empirical questions like: (a) to what degree is 'more' better?; (b) how important are filler words? (c) how important are words that signal connection, causality, influence, reasoning?</p>
]]></description><pubDate>Sun, 05 Apr 2026 13:33:02 +0000</pubDate><link>https://news.ycombinator.com/item?id=47649281</link><dc:creator>xpe</dc:creator><comments>https://news.ycombinator.com/item?id=47649281</comments><guid isPermaLink="false">https://news.ycombinator.com/item?id=47649281</guid></item><item><title><![CDATA[New comment by xpe in "A Recipe for Steganogravy"]]></title><description><![CDATA[
<p>Pro-tip from unfrozen caveman lawyer: "Your honor. My client want hide thing from t-rex lang mo-del. He have big brain. So he not put thing on Al Gore device with series of tubes. (Unlike many on modern-day BBS called Haxer News.) T-rex not eat what t-rex not find."</p>
]]></description><pubDate>Fri, 03 Apr 2026 14:50:11 +0000</pubDate><link>https://news.ycombinator.com/item?id=47627307</link><dc:creator>xpe</dc:creator><comments>https://news.ycombinator.com/item?id=47627307</comments><guid isPermaLink="false">https://news.ycombinator.com/item?id=47627307</guid></item></channel></rss>