timefirstgrav (u/timefirstgrav)

timefirstgrav commented on Banned in California bannedincalifornia.org/... · Posted by u/pie_flavor

Operating systems are now updating legal docs so people in california can't use them. California has gone full retard.

https://github.com/MidnightBSD/src/commit/7d956a27123f2d77a0...

timefirstgrav commented on What happened to running what you wanted on your own machine? hackaday.com/2025/10/22/w... · Posted by u/marbartolome

everdrive · 5 months ago

It's important to understand that we could genuinely lose general purpose computing. I don't think it's in serious danger at the moment, but we've been in the midst of a slide in that direction for the last 10-15 years. Part of it is mobile phones, part of it is TPM, part of it is market forces. The latest turn is strictly political. We've really foolishly built the technology necessary for authoritarianism just a few years head of a general global trend towards authoritarianism. At the moment, anyone can use Linux; it's better and easier than ever. Will the laws of your country make it harder or more difficult to avoid? Will major vendors lock you out of basic functions? Will age verification require an agent run on your Windows or macOS computer? (or worse, require the use of a smart phone just to use the internet?)

We're not anywhere there yet, but we're closer than we've ever been, and things keep moving in the wrong direction.

timefirstgrav · 4 months ago

Oh wow... The idea of losing general purpose computing is a terrifying thought I've never considered before.

timefirstgrav commented on Xubuntu.org Might Be Compromised old.reddit.com/r/Ubuntu/c... · Posted by u/kekqqq

amelius · 5 months ago

Let's not kid ourselves. A state level actor who is playing the long game can compromise any distro, package, etc. without us knowing about it.

timefirstgrav · 5 months ago

Jia Tan with the XZ backdoor was caught because some performance obsessed person noticed a tiny delay... I'm sure they learned their lesson and are ensuring their next backdoor doesn't impact performance.

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timefirstgrav commented on Implicit ODE solvers are not universally more robust than explicit ODE solvers stochasticlifestyle.com/i... · Posted by u/cbolton

tomrod · 6 months ago

> Trying to handle instantaneous constraints and propagating modes with a single timestepper is often suboptimal.

When I read statements like this, I wonder if this is related to optimal policy conditions required for infinitely lived Bellman equations to have global and per-period policies in alignment

timefirstgrav · 6 months ago

That's a fascinating parallel! both involve separating timeless constraints (value function / elliptic equation) from temporal dynamics (policy / flux evolution).

Trying to timestep through a constraint that should hold instantaneously creates artificial numerical difficulties. The Bellman equation's value iteration is actually another example of this same pattern...

timefirstgrav commented on Implicit ODE solvers are not universally more robust than explicit ODE solvers stochasticlifestyle.com/i... · Posted by u/cbolton

timefirstgrav · 6 months ago

This aligns with what I've observed in computational physics.

Trying to handle instantaneous constraints and propagating modes with a single timestepper is often suboptimal.

I developed a framework that systematically separates these components: using direct elliptic solvers for constraints and explicit methods for flux evolution. The resulting algorithms are both more stable and more efficient than unified implicit approaches.

The key insight is that many systems (EM, GR, fluids, quantum mechanics) share the same pattern: - An elliptic constraint equation (solved directly, not timestepped) - A continuity law for charge/mass/probability flux - Wave-like degrees of freedom (handled with explicit methods)

Witgh this structure, you can avoid the stiffness issues entirely rather than trying to power through them with implicit methods.

Paper: https://zenodo.org/records/16968225

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KarmaCake day27August 13, 2025View Original