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Blog de Hqak (wxyhly)
Mercator Projection

Mercator Projection

"Dimensions" film talks about using stereographic projection to create maps. But the world maps we are familiar with are not made this way. World maps use another type of projection, and the map it pr
2016-11-09
#Javascript #Geometry
5D Cube's Cross-section Puzzle

5D Cube's Cross-section Puzzle

We know that a cube can be obliquely sectioned to produce a regular hexagonal cross-section, which intersects 6 faces of the cube. Generalizing to 4D, a certain cross-cell intersects all 8 cells of a
2016-11-03
#4D #Geometry #5D
Hyperbolic Space - Mathematical Art

Hyperbolic Space - Mathematical Art

I mentioned a circular disk pattern that appeared in the film "Dimensions:A walk through mathematics". Actually this pattern is as fascinating as 4D space - Hperbolic tessellation in hyperbolic space.
2016-06-26
#Mathematics #Javascript #Graphics #Geometry #Hyperbolic Space
Build Digital Circuits with Hutton32 (II): Logic Components

Build Digital Circuits with Hutton32 (II): Logic Components

The previous article introduced AND, OR, and NOT gates in Hutton32. Now let's use their combinations to do some interesting things. (Like a perfect square calculator!)
2016-06-10
#Circuit #Automaton #Hutton32
Build Digital Circuits with Hutton32 (I): Logic Gates

Build Digital Circuits with Hutton32 (I): Logic Gates

Recently I saw someone use redstone circuits in Minecraft to create a calculator, it seems to be able to calculate floating-point numbers and trigonometric functions. I don't know much about redstone,
2016-06-03
#Circuit #Automaton #Hutton32
Electron-Deficient Planet vs Electron-Rich Planet

Electron-Deficient Planet vs Electron-Rich Planet

In the direction of Ursa Major, at the edge of the M82 Cigar Galaxy dozens of light-years from Earth, there exists a lonely star system. Apart from the star at its center, this system contains two p
2016-05-18
Strange World Series
#Chemistry #Peculiar Imagination
Inverse Earth

Inverse Earth

This is a special world. In this world, you still have blue sky overhead and solid ground beneath your feet, seemingly no different—yet this world is completely different. In this world, even vacuum h
2016-05-04
Strange World Series
#Physics #Peculiar Imagination
4D Space (VIII): Visiting a 4D Country

4D Space (VIII): Visiting a 4D Country

Now imagine one day you are invited to visit a 4D country and learn about their culture and science and technology. What would that be? In the vast 4D universe, galaxies are scattered sporadically. Th
2016-05-02
4D Space Series
#Physics #4D #Peculiar Imagination #Geometry
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