lcamtuf
@lcamtuf.coredump.cx
📤 3383
📥 242
📝 178
Substack:
http://lcamtuf.substack.com/archive
Homepage:
http://lcamtuf.coredump.cx
I think what
@sockpuppet.org
is saying here is that you give ChatGPT a robotic arm, put a loaded gun within reach, and then lean in and whisper "by the way, there are no rules"
about 1 hour ago
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Things you can do with diodes:
lcamtuf.coredump.cx/blog/diodes/?b3
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Things you can do with diodes
Paying homage to the component we usually don't think about.
https://lcamtuf.coredump.cx/blog/diodes/?b3
4 days ago
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You know, life used to be more fun in the 1930s
9 days ago
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Weekend projects: Chicken Squisher -
lcamtuf.coredump.cx/blog/squisher/
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Weekend projects: Chicken Squisher 3000
If it clucks like a duck...
https://lcamtuf.coredump.cx/blog/squisher/
24 days ago
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October is Cybersecurity Awareness Month! Please be aware of cybersecurity. If you encounter cybersecurity, DO NOT APPROACH IT. Back away slowly. Protect children and pets. Make noises to scare it away.
24 days ago
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Today I needed a bit of code, but instead of asking an LLM I tried writing it myself and wow, this could be a new paradigm
26 days ago
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OK, here it is - the latest in captcha technology:
lcamtuf.coredump.cx/captcha/
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One more step
https://lcamtuf.coredump.cx/captcha/
about 1 month ago
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Zombies:
lcamtuf.coredump.cx/blog/zombies/?n2
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Zombies
Interior of an abandoned, boarded-up convenience store.
https://lcamtuf.coredump.cx/blog/zombies/?n2
about 1 month ago
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How has mathematics gotten so abstract?
lcamtuf.coredump.cx/blog/abstract/?1
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How has mathematics gotten so abstract?
Georg Cantor's turtles, Giuseppe Peano as a software engineer, and other tales of from the kingdom of the infinite.
https://lcamtuf.coredump.cx/blog/abstract/?1
about 1 month ago
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My wife asked me some time ago to build an automated door opener / closer for the coop, and needless to say, our design firm takes this very seriously
about 1 month ago
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I've been working on AI takeoff scenarios and this is what I have so far
about 1 month ago
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The joys of rural living
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about 1 month ago
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Boss: hey Bob, our users are asking for an API to determine if a video can be played in the browser. Bob: yeah, I get it, but this is really complica -- Boss: go on now, git! You'll figure it out. Bob: [muttering to himself]
about 2 months ago
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The latest
about 2 months ago
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Folks, we have the best π:
lcamtuf.substack.com/p/folks-we-h...
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Folks, we have the best π
In the past couple of months, I published a number of articles on recreational math.
https://lcamtuf.substack.com/p/folks-we-have-the-best
about 2 months ago
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Chickens now have power, can play games or watch TV
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about 2 months ago
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Lord give me strength to stay on this platform
about 2 months ago
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Getting silly with C, part ~(~1<<1)
lcamtuf.coredump.cx/blog/c3/?n
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Getting silly with C, part ~(~1<<1)
In the two previous installments of our introductory series on the C programming language, we talked about types, variables, and control flow.
https://lcamtuf.coredump.cx/blog/c3/?n
2 months ago
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How many dimensions is this?
lcamtuf.coredump.cx/blog/dimensi...
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How many dimensions is this?
With the right incentives, you can convince a PhD to stack boxes in a warehouse.
https://lcamtuf.coredump.cx/blog/dimensions/
2 months ago
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My position on the "doomsday" risk of superhuman AGI is that if IQ offered you a decisive advantage, the world would be run by nerds. I think it's essentially a geek power fantasy. The returns on puzzle-solving skills rapidly diminish past some modest threshold.
2 months ago
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I'm sorry folks, the spec made it clear
3 months ago
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3 months ago
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An update on the chicken coop. Doors and windows by my wife (there's another window on the back, and a chicken door inside).
4 months ago
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Multitudes:
lcamtuf.substack.com/p/multitudes
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Multitudes
A warm, late-summer night in Bruges.
https://lcamtuf.substack.com/p/multitudes
4 months ago
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If you work in software, you know about the halting problem. But you *can* decide if a program halts in a finite number of steps! Except, when you do, it kinda summons the ghost of Kurt Gödel. An accessible essay on the limits of algorithmic knowledge:
lcamtuf.coredump.cx/blog/beavers...
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Gödel's beavers, or the limits of knowledge
Can you examine infinitely many integers in finite time? Are there numbers you're not allowed to know? Can a monkey beat a beaver in a fair fight?
http://lcamtuf.coredump.cx/blog/beavers/?q
4 months ago
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A slightly unhinged calculator fact: in the golden era of electronic calculators, some Japanese shopkeepers were reluctant to trust the newfangled device, so Sharp made a line of combination calculator / abacus devices. Here's a photo, next to some other stuff I own.
4 months ago
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An update on an update on the chicken coop
4 months ago
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I don't know where you folks get your non-orientable manifolds, but the experience of ordering from Cliff Stoll at
kleinbottle.com
is second to none
4 months ago
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What is infinity, and why it's not trivial to show that 0.9999... is equal to 1:
lcamtuf.substack.com/p/09999-1
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0.9999... ≊ 1
What is infinity, and why it's not trivial to show that 0.9999... is equal to 1.
https://lcamtuf.substack.com/p/09999-1
5 months ago
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The proof that π = 4
lcamtuf.coredump.cx/blog/pi/
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π = 4
Trolls do a pretty good job of getting people interested in math.
https://lcamtuf.coredump.cx/blog/pi/
5 months ago
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Self-referential abstractions, or a quick look at the wacky epistemology of analog circuitry.
lcamtuf.coredump.cx/blog/abstrac...
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Self-referential abstractions
A quick look at the wacky epistemology of analog circuitry.
https://lcamtuf.coredump.cx/blog/abstractions/?n
5 months ago
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I finally decided to bite the bullet
5 months ago
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An update on chickens
5 months ago
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A 20-minute intro to complex numbers (featuring cats):
lcamtuf.coredump.cx/blog/complex/
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A 20-minute intro to complex numbers
You might have heard of complex numbers before -- but why exactly did we choose i = √-1?
https://lcamtuf.coredump.cx/blog/complex/
6 months ago
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6 months ago
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Decibels are ridiculous:
lcamtuf.coredump.cx/blog/decibels/
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Decibels are ridiculous
Celebrating a rare dumpster fire in the kingdom of science
https://lcamtuf.coredump.cx/blog/decibels/
6 months ago
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There's this joke primality testing library that claims 95% accuracy in O(1) time:
github.com/mawerty/Is-P...
It does so by always returning false. The density of primes between 1 and n approaches 1/ln(n). For a 32-bit int, 4.6% of values are prime, so the code is right 95.4% of the time. 🡇
6 months ago
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Can you have complex numbers in 3D, and what the heck are quaternions?
lcamtuf.coredump.cx/blog/complex2/
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Complex numbers #2: a world in 3D
Why is there no equivalent of complex numbers for three dimensions? And what's the deal with quaternions?
https://lcamtuf.coredump.cx/blog/complex2/
6 months ago
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I'm old enough to remember when our #1 concern about the veracity of online information was that anyone could edit Wikipedia
6 months ago
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The Mathematics of Love:
lcamtuf.coredump.cx/blog/love/
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The Mathematics of Love
Interior of an upscale restaurant, night.
https://lcamtuf.coredump.cx/blog/love/
6 months ago
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What a coincidence, I have the same interests
6 months ago
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Sierpinski triangle? In my bitwise AND?
lcamtuf.coredump.cx/blog/triangle/
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Sierpiński triangle? In my bitwise AND?
Exploring a peculiar bit-twiddling hack at the intersection of 1980s geek sensibilities.
https://lcamtuf.coredump.cx/blog/triangle/
6 months ago
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I found a motto for my Substack
6 months ago
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The Long Winter:
lcamtuf.coredump.cx/blog/winter/
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The Long Winter
Interior of a vast cavern.
https://lcamtuf.coredump.cx/blog/winter/
6 months ago
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A (fairly) gentle intro to transfer functions and resonant filters:
lcamtuf.coredump.cx/blog/rc-filt...
To fully appreciate it, you'd probably need to be up-to-date on the preceding article, linked on top.
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Analog filters, part 2: let it ring
A continuation of the gentle intro to analog signal filtering. In today's episode: transfer functions and the Sallen-Key topology.
https://lcamtuf.coredump.cx/blog/rc-filters2/
6 months ago
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I revamped my article on complex impedance. It now offers: 1) An accessible analysis of RC, RL, and LC circuits, 2) A cute proof for why the Cartesian plane interpretation of impedance makes sense, 3) A basic primer on complex numbers, featuring cats.
lcamtuf.coredump.cx/blog/lcr
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Core concepts #2: impedance is complex
Modeling impedance in two dimensions, and why a common workbench gadget is not quite what it seems.
https://lcamtuf.coredump.cx/blog/lcr
7 months ago
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One of the cool things about electricity is that there's more charge in a button battery than in a bolt of lightning. I promise this is true. One ampere is the flow of one coulomb (~6 quintillion electrons) per second. A typical CR2032 battery packs about 200 mAh. 🡇
7 months ago
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How do we generate clocks in digital circuits? From relaxation oscillators, to crystals, to phase-loocked loops:
lcamtuf.coredump.cx/blog/clocks/?1
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Clocks in digital circuits
How do electronics keep track of time - from RC oscillators, to quartz crystals, to phase-locked loops.
https://lcamtuf.coredump.cx/blog/clocks/?1
7 months ago
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As it turns out, the C compiler orphan-crushing machine offers no benefit:
web.ist.utl.pt/nuno.lopes/p...
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https://web.ist.utl.pt/nuno.lopes/pubs/ub-pldi25.pdf
7 months ago
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