ENIGMATH

Pentadecagon
Polygon with fifteen sides and fifteen vertices.
🔗 blogenigmath.wordpress.com/2025/08/06/p...
#enigmath #math #polygon

Cardioid
The parametric equations of the cardioid can be given by
x = a cos t(1 - cos t), y = a sin t (1 - cos t)
In polar coordinates the equation of a cardioid is given by
r = a (1 - cos θ)
#enigmath #math #curve

Nine
Nine is a composite number with proper divisors 1 and 3.
🔗 blogenigmath.wordpress.com/2025/08/04/n...
#enigmath #math #number

My geometry puzzle book Birds, Bees and Burgers 🐦🐝🍔
It has 60 geometry puzzles, all of them with step by step solutions, with 6 levels of difficulty.
It has a 5-star rating on Amazon.
🔗 www.amazon.com/Birds-Bees-B...
#enigmath #math #geometry #puzzle #book

Amazons
The Game of the Amazons is a board game for two players invented in 1988 by the Argentine Walter Zamkauskas, usually played in an international board of draughts 10 x 10 squares.
🔗 blogenigmath.wordpress.com/2025/08/03/a...
#enigmath #math #game

Puzzle 13
Write the number 2011 using only the digit 4 and any of the operations of addition, subtraction, multiplication, division, exponentiation, taking a square...
This puzzle was published at @plusmaths.bsky.social’s website.
🔗 blogenigmath.wordpress.com/2025/08/02/p...
#enigmath #math #puzzle

The Professor’s Beloved Equation
On the first day of class a young teacher enters an unruly room and begins his first lecture. To gain the students’ attention he relates the story of what probably led him into a life of mathematics.
#enigmath #math #movie

Abel-Jacobi map
The Abel–Jacobi map is a construction of algebraic geometry which relates an algebraic curve to its Jacobian variety.
🔗 blogenigmath.wordpress.com/2025/07/31/a...
#enigmath #math #dictionary

Elbphilharmonie
Located: Hamburg, Germany.
Completed: 2017.
Architect: Herzog & de Meuron.
#enigmath #math #architecture

“Geometry is that of mathematical science which is devoted to consideration of form and size, and may be said to be the best and...”

Robert Chambers
– Scottish publisher, author, journal editor, geologist, and evolutionary thinker
🔗 blogenigmath.wordpress.com/2025/07/29/r...
#enigmath #math #quote

Cloud Gate
Artist: Anish Kapoor.
Created: 2006.
Media: Stainless steel.
Location: Millenium Park, Chicago, Illinois, United States of America.
#enigmath #math #art

Ding dong
Cartesian equation
x² + y² + z³ = z²
#enigmath #math #surface

Icosidodecahedron
Polyhedron with thirty two faces: twenty equilateral triangles and twelve regular pentagons.
🔗 blogenigmath.wordpress.com/2025/07/26/i...
#enigmath #math #polyhedron

Pentagonal tiling 1
 + B̂ = 180º
Ĉ + D̂ + Ê = 360º
#enigmath #math #tiling

Sergei Adian
Azerbaijani mathematician.
🔗 blogenigmath.wordpress.com/2025/07/24/s...
#enigmath #math #mathematician

Tetradecagon
Polygon with fourteen sides and fourteen vertices.
🔗 blogenigmath.wordpress.com/2025/07/23/t...
#enigmath #math #polygon

Hypotrochoid
The parametric equations of the hypotrochoid can be given by
x = (a - b) cos t + h cos ((a - b)/b t), y = (a - b) sin t - h sin ((a - b)/b t)
#enigmath #math #curve

Eight
Eight is a composite number with proper divisors 1, 2 and 4
🔗 blogenigmath.wordpress.com/2025/07/21/e...
#enigmath #math #number

Mystery number
Think of a number between 51 and 99, both included.
Continue reading the post 🔗 blogenigmath.wordpress.com/2025/07/20/m...
#enigmath #math #magic

Northcott’s game
The game uses a rectangular board with n rows and m columns. So, it can be played in a chessboard.
🔗 blogenigmath.wordpress.com/2025/07/19/n...
#enigmath #math #game

Puzzle 12
ACROSS
1 The Roman Numeral DCCXXXIX
4 Mersenne number
6 Sophie Germain number
8 Fibonacci number
DOWN
2 Square number
3 Mersenne number
5 Cube of 8
7 Square root of 576
Solution 🔗 blogenigmath.wordpress.com/2025/07/18/p...
#enigmath #math #puzzle

My geometry puzzle book Birds, Bees and Burgers 🐦🐝🍔
It has 60 geometry puzzles, all of them with step by step solutions, with 6 levels of difficulty.
It has a 5-star rating on Amazon.
🔗 www.amazon.com/Birds-Bees-B...
#enigmath #math #geometry #puzzle #book

Abel’s irreducibility theorem
If one root of the equation f(x)=0, which is irreducible over a field K, is also a root of the equation F(x)=0 in K, then all the roots of the irreducible equation f(x)=0 are roots of F(x)=0.
🔗 blogenigmath.wordpress.com/2025/07/16/a...
#enigmath #math #dictionary

Grande Arche
Located: Paris, France.
Completed: 1989.
Architect: Johan Otto von Spreckelsen.
#enigmath #math #architecture

“This statistical regularity in moral affairs fully establishes their being under the presidency of law. Man is now seen to be an enigma only as an individual; in the mass he is a mathematical problem.”

Robert Chambers
#enigmath #math #quote

Hommage au Carré
Artist: Josef Albers.
Created: 1965.
Media: Serigraph.
Genre: Abstract art.
Location: HK Art Advisory + Projects, California, United States of America.
#enigmath #math #art

Daisy
Cartesian equation
(x² − y³)² = (z² − y²)³
#enigmath #math #surface

Cuboctahedron
Polyhedron with fourteen faces: eight equilateral triangles and six squares.
🔗 blogenigmath.wordpress.com/2025/07/11/c...
#enigmath #math #polyhedron

Snub trihexagonal tiling
Snub trihexagonal tiling is one of the eight semiregular tilings of the Euclidean plane. It is composed by one regular hexagon and four equilateral triangles.
#enigmath #math #tiling

José Ádem
Mexican mathematician.
🔗 blogenigmath.wordpress.com/2025/07/09/j...
#enigmath #math #mathematician