ENIGMATH

Octahemioctahedron
Polyhedron with twelve faces with eight equilateral triangles and four regular hexagons.
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#ENIGMATH #math #surface

Pentagonal tiling 13
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#ENIGMATH #math #tiling

Hirotugu Akaike
Born: November 5, 1927, Shizuoka Prefecture, Japan.
Died: August 4, 2009, Ibaraki Prefecture, Japan.
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#ENIGMATH #math #mathematician

Twenty-one
Twenty-one is a composite number with proper divisors 1, 3 and 7.
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#ENIGMATH #math #number

Mastering Geometry Puzzles
My new book with 120 geometry puzzles, all of them with step-by-step solutions.
You can pre-order it on Amazon.
Learn more about the book below 👇
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#math #geometry #puzzle #book #MasteringGeometryPuzzles #booksky

Puzzle #25 A semicircle is inscribed in a right/right-angled triangle. What is the area of the semicircle? Solution The right/right-angled triangle is a Pythagorean triple: (3, 4, 5) The semicircle is tangent…

Solution 👇
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Puzzle #25
A semicircle is inscribed in a right(-angled) triangle.
What is the exact area of the semicircle?
#ENIGMATH #math #puzzle

Dual abelian variety
To an abelian variety A over a field k, one associates a dual abelian variety Aᵛ (over the same field), which is the solution to the following moduli problem.
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#ENIGMATH #math #dictionary

Herbert Dingle “Mathematics in itself, as I say, is independent of experience. It begins with the free choice of symbols, to which are freely assigned properties, and it then proceeds to deduce the necessar…

“Mathematics in itself, as I say, is independent of experience. It begins with the free choice of symbols, to which are freely assigned...”

Herbert Dingle
– English physicist and philosopher of science
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#ENIGMATH #math #quote

Leopold
Cartesian equation
1000x²y²z² + 3x² + 3y² + z² = 1
#ENIGMATH #math #surface

Tetrahemihexahedron
Polyhedron with seven faces with four equilateral triangles and three squares.
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#ENIGMATH #math #polyhedron

Pentagonal tiling 12
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#ENIGMATH #math #tiling

Alexander Aitken
Born: April 1, 1895, Dunedin, New Zealand.
Died: November 3, 1967, Edinburgh, Scotland.
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#ENIGMATH #math #mathematician

Mastering Geometry Puzzles
My new book with 120 geometry puzzles, all of them with step-by-step solutions.
You can pre-order it on Amazon.
Learn more about the book below 👇
blogenigmath.wordpress.com/2025/10/19/m...
#math #geometry #puzzle #book #MasteringGeometryPuzzles #booksky

Twenty
Twenty is a composite number with proper divisors 1, 2, 4, 5 and 10.
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#ENIGMATH #math #number

Puzzle #24
Move two matchsticks to get an odd number.
This puzzle was published on the @newscientist.com.
Solution 👇
blogenigmath.wordpress.com/2025/11/29/p...
#ENIGMATH #math #puzzle

Abelian variety of CM-type
An abelian variety A defined over a field K is said to have CM-type if it has a large enough commutative subring in its endomorphism ring End(A). An abelian variety of CM-type is named after Niels Abel.
#enigmath #math #dictionary

“With a view to summon myself to the search for a science of mathematics in general, I asked myself… what precisely was the meaning of this...”
René Descartes
– French philosopher, scientist, and mathematician
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#enigmath #math #quote

Hummingbird
Cartesian equation
x³ + x²z² − y² = 0
#enigmath #math #surface

Great icosahedron
Polyhedron with twenty intersecting triangular faces with five triangles meeting at each vertex in a pentagrammic sequence.
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#enigmath #math #polyhedron

Pentagonal tiling 11
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blogenigmath.wordpress.com/2025/11/24/p...
#enigmath #math #tiling

Mastering Geometry Puzzles
My new book with 120 geometry puzzles, all of them with step-by-step solutions.
You can pre-order it on Amazon.
Learn more about the book below 👇
blogenigmath.wordpress.com/2025/10/19/m...
#math #geometry #puzzle #book #MasteringGeometryPuzzles #booksky

John Aitchison
Born: July 22, 1926, East Linton, East Lothian, Scotland, United Kingdom.
Died: December 23, 2016, Glasgow, Scotland, United Kingdom.
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#enigmath #math #mathematician

Fibonacci Day is an informal holiday celebrated on November 23 to honor the Italian mathematician Leonardo of Pisa, also known as Fibonacci. The date, when written in the month/day format (11/23), represents the first four numbers of the Fibonacci sequence: 1, 1, 2, 3.
#enigmath #math #FibonacciDay

Nineteen
Nineteen is a prime number.
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#enigmath #math #number

Abalone
Abalone abstract strategy board game by Michel Lalet and Laurent Lévi in 1987.
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#enigmath #math #game

Puzzle #23
The figure is composed by twenty nine matchsticks.
Move two matchsticks to get a correct multiplication result.
This puzzle was published on the @newscientist.com.
Solution 👇
blogenigmath.wordpress.com/2025/11/20/p...
#enigmath #math #puzzle

Abelian variety
An abelian variety, named after Niels Abel, variety is a higher dimensional version of an elliptic curve.
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#enigmath #math #dictionary

“The nature of mathematical demonstration is totally different from all other, and the difference consists in this—that, instead of showing the contrary of the proposition asserted to be only improbable, it...”
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#enigmath #math #quote

Heaven and Hell
Cartesian equation
x² − y²z² = 0
#enigmath #math #surface