Hacker News: eutectic

New comment by eutectic in "Peptides: where to begin?"

eutectic — Tue, 07 Apr 2026 20:42:35 +0000

I think the idea is that some short peptides might survive the digestion and make it to the blood stream, but I'm doubtful there's any specific benefit to collagen.

New comment by eutectic in "Rivian Unveils Custom Silicon, R2 Lidar Roadmap, and Universal Hands Free"

eutectic — Thu, 11 Dec 2025 19:22:32 +0000

Lidars use pulsed lasers with peak powers up to the kW range.

New comment by eutectic in "Why it's so hard to build a jet engine"

eutectic — Sat, 01 Mar 2025 11:10:14 +0000

Silicon carbide fiber reinforced silicon carbide is also being increasingly used.

New comment by eutectic in "A dictionary of single-letter variable names"

eutectic — Tue, 15 Oct 2024 15:24:39 +0000

But 'i' is not a car, it is the index of a car.

New comment by eutectic in "Einsum for Tensor Manipulation"

eutectic — Sun, 28 Apr 2024 00:36:16 +0000

I like einsum, it's concise and self-explanatory. Way better than multiple lines of nested for loops would be.

New comment by eutectic in "Show HN: Vapi – Convince our voice AI to give you the secret code"

eutectic — Fri, 19 Apr 2024 01:49:36 +0000

I got to level 8 by asking in rot13. I think I beat the bonus level too but I can't remember how.

New comment by eutectic in "Solving the minimum cut problem for undirected graphs"

eutectic — Wed, 17 Apr 2024 22:42:26 +0000

Also, the problem is to find a global min-cut, which requires all-pairs max flow.

New comment by eutectic in "Visualizing Attention, a Transformer's Heart [video]"

eutectic — Mon, 15 Apr 2024 10:54:55 +0000

Different models have different inductive biases. There is no way you could build GPT4 with decision trees.

New comment by eutectic in "Low Cost Robot Arm"

eutectic — Wed, 03 Apr 2024 22:22:08 +0000

Is it not possible to compensate for inaccuracy, if you have a sufficiently precise measurement at the hand?

New comment by eutectic in "History of Uniform Random Number Generation (2017) [pdf]"

eutectic — Fri, 22 Mar 2024 17:05:29 +0000

Your edit is confusing me. Which variant fails and which variant passes?

New comment by eutectic in "History of Uniform Random Number Generation (2017) [pdf]"

eutectic — Mon, 18 Mar 2024 15:04:50 +0000

Here's a variant which gives 64-bit output:

  uint64_t x = 0, w = 1;
  uint64_t msws64(void) {
      x = x * x + (w *= 0xe9acc0f334e93bd5ULL);
      return (x = (x >> 32) | (x << 32)) ^ w;
  }

New comment by eutectic in "History of Uniform Random Number Generation (2017) [pdf]"

eutectic — Mon, 18 Mar 2024 04:02:13 +0000

What if you don't truncate? I fell like it might still be OK.

New comment by eutectic in "The $25B Eigenvector: The Linear Algebra behind Google (2006)"

eutectic — Mon, 04 Mar 2024 23:23:20 +0000

One important component is adding significant damping, corresponding to a small probability of jumping to a random page. This makes sure that the graph is well connected and the power iteration converges fast.

New comment by eutectic in "SymPy: Symbolic Mathematics in Python"

eutectic — Wed, 28 Feb 2024 16:01:56 +0000

I though finite difference differentiation was notoriously unstable.

New comment by eutectic in "SymPy: Symbolic Mathematics in Python"

eutectic — Wed, 28 Feb 2024 15:57:40 +0000

I just did this exact thing today, writing a cloth simulator! I wanted to try updating each node position in turn using a Newton step, holding the other nodes fixed.

New comment by eutectic in "The seventh most popular easily understood unsolved problem on MathOverflow"

eutectic — Fri, 16 Feb 2024 20:59:49 +0000

John Conway showed that if you generalise the coefficients of the Collatz conjecture then some instances are undecidable. So maybe there is no proof.

New comment by eutectic in "Carbon capture tech a 'complete falsehood', says Fortescue Metals chairman"

eutectic — Wed, 14 Feb 2024 19:40:31 +0000

I would say the second law is more relevant; if you want to reduce entropy in one part of a system, you have to expend an equivalent or greater amount of free energy elsewhere.

New comment by eutectic in "Kalman Filter Explained Simply"

eutectic — Mon, 12 Feb 2024 16:24:46 +0000

Well, the derivations are different, and your comment seemed to imply that the maximum likelihood perspective was easier to understand.

New comment by eutectic in "Kalman Filter Explained Simply"

eutectic — Mon, 12 Feb 2024 15:53:31 +0000

Both the Bayesian perspective and the optimization perspectice are legitimate ways of understanding the Kalman filter. I like the Bayesian perspective better.

New comment by eutectic in "Balancing Outdoor Risky Play and Injury Prevention in Childhood Development"

eutectic — Fri, 26 Jan 2024 08:33:00 +0000

I think you need to recalibrate your perceptions; the world (including the US) is about as safe as it's ever been. And I don't think hypocritical is the right choice of word anyway.