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Finding Waldo in π
The SMBC comic Convert included as the “Votey button” a challenge to extract a Waldo visual from the digits of π.
New
The latest blog posts to take off on Hacker News. 2,851 posts.
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What do new Sudoku techniques teach us about real-world problem solving?
What do revolutionary new Sudoku techniques teach us about real-world problem solving?
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Implementing Cosine in C from Scratch (2020)
How does the math library's trigonometric function work?
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When Double Precision Is Not Enough
Using greater than double precision to calculate the eigenvalues of the lesp matrix.
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A 9-line summary of textbook physics
All their wonders in one table
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Why tensors? A beginner's perspective
Faizan Muhmmad is a Software Engineer at Google
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Damn Cool Algorithms: Levenshtein Automata
Posted by Nick Johnson | Filed under python , tech , coding , damn-cool-algorithms
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How does perspective work in pictures?
Why don’t photographs make distant objects big enough?
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An unwinnable seed of Slay the Spire
Overview In this post, I will describe a collaborative effort that proved that unwinnable Slay the Spire seeds exist. This project is joint work with gamerpuppy and ForgottenArbiter and is based on the several attempts that have been made to prove unwinnability for seeds in Slay the Spire.
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What use is mental math in 2022?
The ability to quick estimates is still valuable, maybe more valuable than it used to be.
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Explanation of Bitcoin’s Elliptic Curve Digital Signature Algorithm
Elliptic Curve Cryptography (ECC) has grown to be very popular in public-key cryptographic systems, most popularly used in Bitcoin. ECC is…
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The Kalman filter: helping chickens cross the road
The Kalman Filter. Helping Chickens Cross the Road. David Austin Grand Valley State University I was running some errands recently when I spied the Chicken Robot ambling down the sidewalk, then vee…
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The claimed effect size is about a zillion times higher than is plausible
Some years ago, you blogged about a research article by Hasan and colleagues (2013) .
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Gödel's Incompleteness Theorem in Bash
Gödel’s first incompleteness theorem states that there are mathematical statements that can neither be proven or disproven. His proof is fairly difficult to ...
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The fastest GIF does not exist
Some games on a website
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A gentle introduction to automated reasoning
Meet Amazon Science’s newest research area.
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Some neurons are active when adding, others when subtracting
Most elementary school children probably already know that three apples plus two apples add up to five apples. However, what happens in the brain during such calculations is still largely unknown. The current study by the Universities of Bonn and Tübingen now sheds light on this issue.
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Corrected identification of object about to hit the moon
Note : I keep getting questions that cause me to realize I should explain something else, or that I explained something poorly. Click here for a list of recent changes. Last modified 2015 Mar 05 16:00 UTC. Here's the original story about this object .
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Breaking 256-Bit Elliptic Curve Encryption with a Quantum Computer
Researchers have calculated the quantum computer size necessary to break 256-bit elliptic curve public-key cryptography: Finally, we calculate the number of physical qubits required to break the 256-bit elliptic curve encryption of keys in the Bitcoin network within the small available time frame in which it would…
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The Kelly criterion: How to size bets (2019)
Let’s play a game. I have a coin that lands heads 60% of the time and tails 40% of the time. You have $25 and can bet on either side of the coin — every time you’re right you double your bet, and every time you are wrong you lose it.
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Finding the average of two unsigned integers without overflow
Another code golfing adventure.
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The Stacks Project, a new model for organizing and visualizing mathematics
Columbia professor Johan de Jong has spent the last 15 years gathering the foundational theorems of algebraic geometry in one place. His creation, the Stacks Project, offers a new model for organizing and visualizing mathematical information.
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Protons are probably smaller than long thought
Our office chair, the air we breathe, the stars in the night sky: they are all made of atoms, which in turn are composed of electrons, protons and neutrons. Electrons are negatively charged; according to current knowledge, they have no expansion, but are point-like. The positively charged protons are different …