Essays

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(2^67)-1
1729
235 Problem
2^64
3n + 1 Problem
4 Queens Problem
5-Smooth Number
8 Queens Problem
88 Hats
9 Queens Problem
99 Bottles of Beer
A Fine Line
Absolute and Relative Tolerance
Ackermann's Function
Advent of Code
AllPartitions
Anagram
AnimalsGame
APL Acknowledgements
APL Chronology
"APL" Origins
APL RNG
APL's Birthday
APL360 Developers Photo
Aspects of J
Atoms
Attribute-Value Processing
Base Spectrum
Bernoulli Numbers
Bernstein Polynomials
Beta Function
Bibliography
Bifactorial
Binary GCD Algorithm
Binary Probability
Binary Tree
Birthday Problem
Bisection Method
Bitwise Functions on Characters
Block Matrix Inverse
Boolean Array Size
Boxed Array Display
Brevity
Capped Fork
Cayley's Theorem
Check Sums
ChessboardPuzzle
Chi-Squared CDF
Chinese Remainder Theorem
Cholesky Decomposition
Christoffel Expressions
Chudnovsky Algorithm
Clockwise Angles
Collatz Conjecture
Combination Index
Combination Sums
Combinations
Complete Tensor
Complex Operations
Compositions
Continued Fractions
Convex Hull
Convolution
Conway's Game of Life
Covert Representation
Cross Product
Cross Sums
Data Structures
Dendrite
Determinant
DiceGame
Distributed Apply
Divisors
Do While
Double Factorial
Duality
Egyptian Fraction
Eigenvalues
English Grammar
Error Function
Euclidean Algorithm
Euler's Formula
Euler's Identity
Extended H
Extended Precision Functions
Extremal Arguments
Factorings
FFT
Fibonacci Index
Fibonacci Sequence
Fibonacci Sums
Floyd
From APL to J
Game of Life
Gauss-Bonnet Theorem
Gaussian Integers
Generalized Monty Hall
Goldbach Conjecture
Grading versus Sorting
Gray Code
Hailstone Sequence
Hamming Number
Hidden Line Removal
Hilbert Matrix
Histogram
Hook Conjunction?
Hook Rank
Huffman Coding
Identity Matrix
IEEE Floating-Point Numbers
In-Place Operations
Incunabulum
Indeterminate
Index in Nub
Inner Products
Insanity Cube
Insert
Integer Root
Integer Knapsack Problem
Insert
Integer Root
Inverse Permutation
Inverted Table
Is a Scalar an Array?
Isometric Surfaces
J for C Programmers Front Cover
J Tweets
JKT Benchmark
Josephus Problem
Kakuro カックロ
KenKen 賢賢
Key
Knapsack Problem
Knight's Tour
Kronecker Product
Kruskal's Algorithm
Krypto
Landau's Function
Large Exponent Real Arithmetic
Levenshtein Distance
Linear Congruential Generator
Linear Recurrences
Linear Regression
Longest Common Subsequence
Longest Increasing Subsequence
Lorenz Attractor
LU Decomposition
Mastermind
Matrix Inverse
Matrix Powers
Memo
Mertens Function
Middle Names
Miller-Rabin Primality Test
Minimal Spanning Tree
Minors
moo
MSLDE
MultipleOr
Multiplicative Order
Möbius Function
N Queens Problem
Name Resolution
NaN
Nearer Larger Neighbor
Negative Rank
Newton's Method
Next Binary String
Non-Adjacent Form (NAF)
Non-Overlapping Substrings
Nonincreasing Odometer
Normal CDF
Notation as a Tool of Thought
Number in Words
Nurikabe ぬりかべ
Odometer
Order Statistics
Parentheses Matching
Partitions
Pascal's Ladder
Pascal's Triangle
Permutation Index
Permutation Inverse
Permutations
Pi
Piano Tuning
Polyminoes
Polynomial Multiplication
Polynomials Intersection
Popcount
Power Set
Primality Tests
Prime APVs
Primes Less Than n
Progressive Index-Of
Propagating Minimum
QR Decomposition
Queens and Knights
Quicksort
Rank Table
Rank
Recursive Descent Parser
Reflexive
Regex Lexer
Regular Number
Repeated Squaring
RNG
Roll on BIGINTs
Roman Numerals
RSA Challenge
Rössler Attractor
Scalars
Schwarzschild
Scope
Self-Downgrading Permutations
Self-Upgrading Permutations
Self-Valued Expression
Semiprimes
Set Game
Set Partitions
Short Circuit Boolean
Simplex Method
Sine
Sort Times
Sorting versus Grading
SpaceTime2D
Square Root
Squeamish Ossifrage
Stirling Numbers
Stirling's Approximation
Substring Replacement
Sudoku 數独
Sum of a Bit Array
Sum of a Vector
Symbol-Minded
Symmetric Array
Symmetries of the Square
Syracuse Problem
t-Distribution CDF
Tacit Expressions
Taxicab Number
Teaching J Syntax
Tensor Experiments
Text Formatting
The Art of Shaving
The Ball Clock Problem
The Essentials of J
The Monty Hall Problem
The TAO of J
Timestamp Extension
Tolerant Comparison
Torsion Tensor
Totient Function
Tower of Hanoi
Trains
Transpose
Tree Display
Tree Sum
Triangular Data
Triangular Matrix Inverse
Tuning a Piano
Un-puzzling expressions
Under
Unforgettable Numbers
Unicode Histogram
Unique Factors
Unit Fraction Sum
Vier Neun
Warnsdorff's Algorithm
Word Formation on Lines
Zeckendorf Representation

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