Jan Marthedal Rasmussen
@janmr.com
Programmer, amateur mathematician, BJJ brown belt
https://janmr.com
https://janmr.com
Bell numbers, the number of ways to partition a set of labeled elements janmr.com/posts/bell-n... #math #combinatorics #bell #numbers
December 30, 2025 at 3:36 PM
Bell numbers, the number of ways to partition a set of labeled elements janmr.com/posts/bell-n... #math #combinatorics #bell #numbers
The Utah Teapot (also known as the Newell Teapot) is one of the most famous 3D models in computer graphics history. It was originally created by Martin Newell in 1975 and went through a number of modifications over the years. graphics.cs.utah.edu/teapot/ #graphics #modelling
December 29, 2025 at 10:52 AM
The Utah Teapot (also known as the Newell Teapot) is one of the most famous 3D models in computer graphics history. It was originally created by Martin Newell in 1975 and went through a number of modifications over the years. graphics.cs.utah.edu/teapot/ #graphics #modelling
Calculus Made Easy is a book on calculus originally published in 1910 by Silvanus P. Thompson, considered a classic and elegant introduction to the subject calculusmadeeasy.org #math #calculus #online #book
December 28, 2025 at 9:35 AM
Calculus Made Easy is a book on calculus originally published in 1910 by Silvanus P. Thompson, considered a classic and elegant introduction to the subject calculusmadeeasy.org #math #calculus #online #book
The Crossed Ladders Problem janmr.com/posts/crosse... #math #geometry #algebra #problem #nerdsniping
December 27, 2025 at 1:32 PM
The Crossed Ladders Problem janmr.com/posts/crosse... #math #geometry #algebra #problem #nerdsniping
The Zen of Python. A listing of Python design principles and philosophies that are helpful in understanding and using the language. The listing can be found by typing `import this` at the interactive prompt. peps.python.org/pep-0020/ #python #programming
December 26, 2025 at 11:49 AM
The Zen of Python. A listing of Python design principles and philosophies that are helpful in understanding and using the language. The listing can be found by typing `import this` at the interactive prompt. peps.python.org/pep-0020/ #python #programming
December 25, 2025 at 10:56 AM
Donald Knuth Annual Christmas Lectures www.youtube.com/playlist?lis... #math #computerscience #programming #online #lecture
Donald Knuth Annual Christmas Lectures - YouTube
Professor Knuth occasionally give lectures at Stanford during the academic year. These lectures are open to the public as well as to students and faculty. No...
www.youtube.com
December 24, 2025 at 9:12 AM
Donald Knuth Annual Christmas Lectures www.youtube.com/playlist?lis... #math #computerscience #programming #online #lecture
Evolved Virtual Creatures by Karl Sims. A more than 30 years old project, but still very interesting. www.karlsims.com/evolved-virt... www.youtube.com/watch?v=RZtZ... #evolution #simulation #physics #engine
Evolved Virtual Creatures by Karl Sims, 1994
Demo of simulated block creatures performing various evolved behaviors.
www.karlsims.com
December 22, 2025 at 10:05 AM
Evolved Virtual Creatures by Karl Sims. A more than 30 years old project, but still very interesting. www.karlsims.com/evolved-virt... www.youtube.com/watch?v=RZtZ... #evolution #simulation #physics #engine
Today marks the December solstice, the shortest day in the Northern Hemisphere and the longest day in the Southern Hemisphere. At 15:03 UTC the North Pole is tilted maximally (about 23.4°) away from the Sun. janmr.com/posts/equino... #astronomy #december #solstice
December 21, 2025 at 1:58 PM
Today marks the December solstice, the shortest day in the Northern Hemisphere and the longest day in the Southern Hemisphere. At 15:03 UTC the North Pole is tilted maximally (about 23.4°) away from the Sun. janmr.com/posts/equino... #astronomy #december #solstice
Evaluation of Powers janmr.com/posts/evalua... #programming #algorithm #cpp #exponentiation #optimality
December 20, 2025 at 12:37 PM
Evaluation of Powers janmr.com/posts/evalua... #programming #algorithm #cpp #exponentiation #optimality
The M/o/Vfuscator compiles programs into "mov" instructions, and only "mov" instructions. Arithmetic, comparisons, jumps, function calls, and everything else a program needs are all performed through mov operations 🤯 github.com/xoreaxeaxeax... #programming #compiler #assembler
December 19, 2025 at 7:18 AM
The M/o/Vfuscator compiles programs into "mov" instructions, and only "mov" instructions. Arithmetic, comparisons, jumps, function calls, and everything else a program needs are all performed through mov operations 🤯 github.com/xoreaxeaxeax... #programming #compiler #assembler
December 18, 2025 at 6:37 AM
Every position of Rubik's Cube can be solved in twenty moves or less www.cube20.org #math #combinatorics #rubikscube
December 17, 2025 at 10:31 AM
Every position of Rubik's Cube can be solved in twenty moves or less www.cube20.org #math #combinatorics #rubikscube
Computing the Integer Binary Logarithm janmr.com/posts/comput... #programming #algorithm #integer #binary #logarithm #numbers #cpp
December 16, 2025 at 12:53 PM
Computing the Integer Binary Logarithm janmr.com/posts/comput... #programming #algorithm #integer #binary #logarithm #numbers #cpp
Stanford Lecture: Dr. Don Knuth - Adventures with Knight's Tours (2025-12-04) www.youtube.com/watch?v=MKiR... (playlist with many of Knuth's lectures: www.youtube.com/playlist?lis...) #math #computerscience #programming #online #lecture
Stanford Lecture: Dr. Don Knuth - Adventures with Knight's Tours (2025)
YouTube video by Stanford Online
www.youtube.com
December 15, 2025 at 12:52 PM
Stanford Lecture: Dr. Don Knuth - Adventures with Knight's Tours (2025-12-04) www.youtube.com/watch?v=MKiR... (playlist with many of Knuth's lectures: www.youtube.com/playlist?lis...) #math #computerscience #programming #online #lecture
Bit Twiddling Hacks, a collection of fast and tested code snippets graphics.stanford.edu/~seander/bit... #programming #binary #numbers #optimization
Bit Twiddling Hacks
graphics.stanford.edu
December 15, 2025 at 7:03 AM
Bit Twiddling Hacks, a collection of fast and tested code snippets graphics.stanford.edu/~seander/bit... #programming #binary #numbers #optimization
December 14, 2025 at 2:45 PM
Test and benchmark suite for sort implementations, github.com/Voultapher/s....
The current `slice::sort_unstable` implementation of the Rust standard library is based on `ipnsort`
github.com/Voultapher/s...
doc.rust-lang.org/1.92.0/std/p...
#sorting #algorithm #rust
The current `slice::sort_unstable` implementation of the Rust standard library is based on `ipnsort`
github.com/Voultapher/s...
doc.rust-lang.org/1.92.0/std/p...
#sorting #algorithm #rust
GitHub - Voultapher/sort-research-rs: Test and benchmark suite for sort implementations.
Test and benchmark suite for sort implementations. - Voultapher/sort-research-rs
github.com
December 13, 2025 at 2:31 PM
Test and benchmark suite for sort implementations, github.com/Voultapher/s....
The current `slice::sort_unstable` implementation of the Rust standard library is based on `ipnsort`
github.com/Voultapher/s...
doc.rust-lang.org/1.92.0/std/p...
#sorting #algorithm #rust
The current `slice::sort_unstable` implementation of the Rust standard library is based on `ipnsort`
github.com/Voultapher/s...
doc.rust-lang.org/1.92.0/std/p...
#sorting #algorithm #rust
December 12, 2025 at 9:25 AM
How to Draw a Straight Line (Peaucellier–Lipkin linkage) www.futilitycloset.com/2014/12/05/s... #math #geometry
Straight and Narrow - Futility Closet
A.B. Kempe’s provocatively titled How to Draw a Straight Line (1877) addresses a fundamental question. In the Elements, Euclid derives his results by drawing straight lines and circles. We can draw a ...
www.futilitycloset.com
December 10, 2025 at 6:18 AM
How to Draw a Straight Line (Peaucellier–Lipkin linkage) www.futilitycloset.com/2014/12/05/s... #math #geometry
December 9, 2025 at 6:53 AM
Two Notes on Notation by Donald E. Knuth (Iverson’s convention and Stirling numbers) arxiv.org/abs/math/920... #math #notation
December 8, 2025 at 8:14 AM
Two Notes on Notation by Donald E. Knuth (Iverson’s convention and Stirling numbers) arxiv.org/abs/math/920... #math #notation
December 7, 2025 at 11:45 AM
Langford pairs: Arrange the 2n numbers {1, 1, 2, 2, ..., n, n} such that exactly k numbers occur between the two appearances of each digit k dialectrix.com/langford.html #math #combinatorics
December 6, 2025 at 2:52 PM
Langford pairs: Arrange the 2n numbers {1, 1, 2, 2, ..., n, n} such that exactly k numbers occur between the two appearances of each digit k dialectrix.com/langford.html #math #combinatorics
Continued Fractions and Continuants janmr.com/posts/contin... #math #computerscience #algoritms #continuedfractions
December 5, 2025 at 6:39 AM
Continued Fractions and Continuants janmr.com/posts/contin... #math #computerscience #algoritms #continuedfractions