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mcherm : math   612

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Online LaTeX Equation Editor - create, integrate and download
A website to enter LaTeX math equations and get back GIF images.
math  blogging  useful  LaTeX 
6 days ago by mcherm
Meet Alex, the Russian Casino Hacker Who Makes Millions Targeting Slot Machines | WIRED
Wired claims this man can reverse engineer the PRNGs in slot machines and make a profit. It's illegal in the US, but not everywhere.
hacking  via:HackerNews  random  math 
8 weeks ago by mcherm
Mathematician Solves Computer Science Conjecture in Two Pages | Quanta Magazine
For 30 years the brightest minds in computer science tried this easy-to-explain problem and failed. The proof is beautiful and incredibly short (1.5 pages written out carefully; abbreviated fits in a tweet).
math  computerscience  via:reddit 
8 weeks ago by mcherm
CoCalc - Collaborative Calculation in the Cloud
This appears to be tool for sharing a programming project online. It has history and allows shared development. Supports lots of stuff from LaTeX to Python to R to Scala. Nicely set up for running a course online.
via:HackerNews  useful  math  python  programming 
april 2019 by mcherm
The Pavlov Strategy - LessWrong 2.0
A different simple strategy that does well in TitForTat tournaments.
philosophy  TitForTat  math 
january 2019 by mcherm
Quanta’s Year in Math and Computer Science (2018) | Quanta Magazine
Several discoveries made this year (by surprisingly young researchers and one amateur).
math  computerscience  via:HackerNews 
december 2018 by mcherm
My hobby: proof engineering | Stephan Boyer
An article from someone who's hobby is doing mathematical proofs in coq. Excellent footnotes.
coq  math  proof  via:reddit 
december 2018 by mcherm
The Search for the Largest Square Number - math
Why is the search for the largest known prime number any different than the search for the largest known square number?
math  funny  via:reddit 
december 2018 by mcherm
Leonardo da Vinci's tree rule may be explained by wind
For some tree species, Leonardo noted, the cross-sectional area of a ranch before a fork is equal to the sum of the cross-sectional areas after the fork. The previous explanation is implausible; this author shows that constant resistance to wind forces could explain it.
LeonardoDaVinci  math  science  biology  via:HackerNews 
december 2018 by mcherm
Get billions of digits of Pi from an incorrect formula
An extremely readable paper proving a certain equation gives a number that matches Pi only for 46 billion digits. Really just plugging a big number into a limit.
math  via:reddit 
december 2018 by mcherm
Bicycles For The Mind: The Slide Rule
About slide rules, but ALSO mentions a Babylonian trick for multiplying using subtraction with just a few pre-computed results.
math  via:HackerNews 
october 2018 by mcherm
Why is 196,884 = 196,883+1 so important? What is an explanation in everyday, simple terms? - Quora
Nicely explained info about the monster group; unfortunately beyond my ability to fully understand.
math  via:reddit 
september 2018 by mcherm
A study of musical scales by Ian Ring
A mathematical view of musical scales. it is an interesting description but I have found others that I thought were more informative.
math  music  via:HackerNews 
august 2018 by mcherm
What Did Ada Lovelace's Program Actually Do?
A close look at the first program ever (by Ada Lovelace) including a bug (which might have been hers or the typesetter's). It calculated Bernoulli numbers.
history  AdaLovelace  programming  bug  via:HackerNews  math 
august 2018 by mcherm
What can be learned from the fact that √2+√3 ~ π
A geometric interpretation of this approximation.
math  via:reddit 
may 2018 by mcherm
The incredible palindromic hat-trick - math
Any number can be expressed as the sum of 3 palindromes. This is true in every base except 2, which occasionally requires 4 palindromes.
math  via:reddit 
may 2018 by mcherm
Statistician Proves Gaussian Correlation Inequality | Quanta Magazine
Older amateur mathematician proves well studied conjecture; simple tools with different approach; article summarizes the math.
math  via:HackerNews  history 
april 2018 by mcherm
For mathematicians, = does not mean equality – Math ∩ Programming
Programming languages often use "=" for assignment; mathematicians use it oddly too.
math  languagedesign  programming  via:HackerNews 
april 2018 by mcherm
GitHub - philipl/pifs: πfs - the data-free filesystem!
Store any value in Pi (assuming it is normal). [Metadata stored separately.]
funny  programming  math  via:reddit 
march 2018 by mcherm
Counterintuitive Properties of High Dimensional Space - Lost in Spacetime
Some interesting properties of multi-dimensional spheres, such as: "the volume increases up to about 5 dimensions, then decreases to near 0" or "most points are "near the equator" of a high-dimensional sphere".
math  geometry  via:HackerNews 
march 2018 by mcherm
Einstein’s Boyhood Proof of the Pythagorean Theorem | The New Yorker
A simple, elegant proof of the Pythagorean theorem which *may* be attributable to a young Albert Einstein.
math  via:reddit  AlbertEinstein 
march 2018 by mcherm
Mathematicians Crack the Cursed Curve | Quanta Magazine
A new method can be used to find rational solutions to equations known to have only a finite number of rational solutions.
math  via:HackerNews 
march 2018 by mcherm
Why Is It Taking 20 Minutes to Mine This Bitcoin Block?
Average block time: 10 mins. But the expected time to mine the block currently being worked on is 20 mins.
math  bitcoin  via:HackerNews 
february 2018 by mcherm
Fermat's Library | Drawing an elephant with four complex parameters annotated/explained version.
Quoth von Neumann: "With four parameters I can fit an elephant, and with five I can make him wiggle his trunk." This paper demonstrates it.
math  physics  via:HackerNews  philosophyOfScience 
february 2018 by mcherm
Content-Type: text/shitpost : I am a mathematician
I am a mathematician (albeit not a professional one, nor a highly skilled one).
math  philosophyOfMath  MarkDominus 
february 2018 by mcherm
The different types (not sizes!) of infinity
Cardinals, Ordinals, Poles/Limits, Hyperreals -- all different types of "infinity".
math  set-theory  infinity 
february 2018 by mcherm
Random with care / fuzzy notepad
Some details about random distributions. Includes picking a random direction and the interesting beta distribution.
math  programming  via:HackerNews 
january 2018 by mcherm
Nefertiti, Confucius, Genghis Khan, and Charlemagne Are Almost Certainly on Your Family Tree
Simple models say a common ancestor of everyone exists just about 600 years ago. Models that include conservative assumptions about isolation and inbreeding say EVERYONE 3600 years ago either had no descendants or is an ancestor of all living humans.
math  history  via:HackerNews  genetics 
january 2018 by mcherm
The Impossible Mathematics of the Real World - Issue 49: The Absurd - Nautilus
A few cases in mathematics where things are not equal but are very, very close. Some are meaningful; others are not.
math  via:reddit 
december 2017 by mcherm
Triangle of Power - New Notation for Logarithms
A different notation to describe logarithms, exponents, and roots symmetrically.
math  via:reddit 
november 2017 by mcherm
Shtetl-Optimized » Blog Archive » My Big Numbers talk at Festivaletteratura
Scott Aaronson takes a new stab at playing the "name the biggest number" game.
bignumbers  math  ScottAaronson 
october 2017 by mcherm
The Joy of Sexagesimal Floating-Point Arithmetic - Scientific American Blog Network
The reason the Babylonians used base 60 is that they did division by multiplying by something conjugate and then correcting the order of magnitude (which they didn't write down).
math  via:HackerNews  history 
september 2017 by mcherm
A more interesting algebra puzzle than typical. - math
A good algebra problem for kids. "How many cats are n the box?"
math  puzzles  via:reddit 
september 2017 by mcherm
Number strings numerical sorting with multi-model database ArangoDB
A representation for ANY size numbers whose lexographic sort is the same as the numeric sort (and that isn't overly wasteful of space).
math  algorithm  via:HackerNews 
september 2017 by mcherm
Why a Dutch court stopped high school students from exchanging schools
Lottery systems, optimal outcomes, and eliminating a reason for "strategic voting".
math  law  election  via:HackerNews 
august 2017 by mcherm
The Kolmogorov option
Scott Aaronson on why Kolmogorov was an amazing mathematician, and why ethical people may wish to remain silent and take no actions about injustices they perceive.
ethics  ScottAaronson  philosophy  history  math  via:HackerNews 
august 2017 by mcherm
Pi and the collapse of peer review « Math Scholar
Pay-to-publish journals can publish the most ridiculous results. Here is a long list of published papers that find a simple algebraic expression for pi.
science  math  ScientificMethod  via:reddit 
august 2017 by mcherm
How Checkers Was Solved - The Atlantic
The man who only lost 6 times, EVER and how checkers was "solved" (exhaustive search of starting and end games that met in the middle).
history  math  games  via:HackerNews 
july 2017 by mcherm
Why is the Quintic Unsolvable?
Attempts to show this in an intuitive fashion with one blog post and some interactive graphs not a whole semester of Galois theory. But I didn't read the whole thing.
math  via:HackerNews  datavisualization 
july 2017 by mcherm
Mathematical Proof That the Lightning Network Cannot Be a Decentralized Bitcoin Scaling Solution
Claims to be a mathematical proof that the core developers proposal for extending Bitcoin won't work. Actually raises a great number of important points but is not a mathematical proof as they claim.
bitcoin  math  via:reddit 
june 2017 by mcherm
Clever algorithm to determine whether or not two words are anagrams - math
Multiply the primes corresponding to each letter. If primes are assigned in order of letter frequency, the integer might not overflow and it might be efficient.
algorithm  math  via:reddit  computerscience 
june 2017 by mcherm
A Puzzle of Clever Connections Nears a Happy End | Quanta Magazine
The "happy ending" problem is so named because the two mathematicians who worked on it with Erdos fell in love and married. They lived 70 years more together, then died just a decade before the problem was (almost) solved.
math  history  via:HackerNews 
june 2017 by mcherm
The mathematicians who want to save democracy : Nature News & Comment
Different mathematicians have different approaches to evaluating how gerrymandered a district map is.
voting  math  via:reddit 
june 2017 by mcherm
A new algorithm for finding a visual center of a polygon | Mapbox
Use a quadtree to efficiently find a close approximation for the point furthest from the edges of an irregular (and potentially concave) polygon.
algorithm  geometry  math  programming  via:HackerNews 
may 2017 by mcherm
how to explain zero-knowledge proof to your children
I should actually review this with my children if they would enjoy it.
math  todo  teaching 
may 2017 by mcherm
Same Stats, Different Graphs: Generating Datasets with Varied Appearance and Identical Statistics through Simulated Annealing | Autodesk Research
You can have VERY different visual appearances for the same mean, standard deviation, and other summary statistics. This paper has examples, and explains the technique they used to generate the data sets.
statistics  datavisualization  via:boingboing  math 
may 2017 by mcherm
Math summer camp?!
todo  math 
april 2017 by mcherm
Statistician Proves Gaussian Correlation Inequality | Quanta Magazine
A major conjecture in statistics is proved, but nobody notices for a while.
math  via:HackerNews 
march 2017 by mcherm
The Fight to Fix Symplectic Geometry | Quanta Magazine
Some see math as fundamentally about ideas and some see it as fundamentally about proofs.
math  philosophyOfMath  via:HackerNews 
february 2017 by mcherm
Machine Learning Refined book
Book from one of the presenters of my machine learning course.
machinelearning  programming  math 
january 2017 by mcherm
How do we know that "countably infinite" is the smallest possible size of infinity? - math
An interesting discussion of cardinalities and of what can be proved without the axiom of choice.
math  set-theory  axiomofchoice  via:reddit 
january 2017 by mcherm
Winning Strategy for Connect-4
The game of Connect-4 is solved. This paper explains the winning strategy.
math  games 
january 2017 by mcherm
Good math problems to share with kids
Has links to several different sources of problems.
math  todo  via:reddit 
january 2017 by mcherm
() - 1302.1479v5.pdf
Express almost any number from 1 to 11111 using digits 1..9 (or 9..1) in order with operators and/or parentheses inserted between digits. The sole exception is making 10958 using 1..9.
math  via:HackerNews 
january 2017 by mcherm
How mathematical language might be different if more mathematicians were wome
The analogy to cloth is actually WAY better language than what we actually use.
math  via:reddit  linguistics 
january 2017 by mcherm
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