# math

Fibonacci all day, every day [http://bit.ly/2jiUBF6]

The Complex Geometry of Islamic Design

In Islamic culture, geometry is everywhere. You can find it in mosques, madrasas, palaces and private homes. This tradition began in the 8th century CE during the early history of Islam, when craftsman took preexisting motifs from Roman and Persian cultures and developed them into new forms of visual expression.

This period of history was a golden age of Islamic culture, during which many achievements of previous civilizations were preserved and further developed, resulting in fundamental advancements in scientific study and mathematics. Accompanying this was an increasingly sophisticated use of abstraction and complex geometry in Islamic art, from intricate floral motifs adorning carpets and textiles, to patterns of tile work that seemed to repeat infinitely, inspiring wonder and contemplation of eternal order.

Despite the remarkable complexity of these designs, they can be created with just a compass to draw circles and a ruler to make lines within them, and from these simple tools emerges a kaleidoscope multiplicity of patterns. So how does that work? Well, everything starts with a circle. The first major decision is how will you divide it up? Most patterns split the circle into four, five or six equal sections. And each division gives rise to distinctive patterns.

There’s an easy way to determine whether any pattern is based on fourfold, fivefold, or sixfold symmetry. Most contain stars surrounded by petal shapes. Counting the number of rays on a starburst, or the number of petals around it, tells us what category the pattern falls into. A star with six rays, or surrounded by six petals, belongs in the sixfold category. One with eight petals is part of the fourfold category, and so on.

There’s another secret ingredient in these designs: an underlying grid. Invisible, but essential to every pattern, the grid helps determine the scale of the composition before work begins, keeps the pattern accurate, and facilitates the invention of incredible new patterns. Let’s look at an example of how these elements come together.

We’ll start with a circle within a square, and divide it into eight equal parts. We can then draw a pair of criss-crossing lines and overlay them with another two. These lines are called construction lines, and by choosing a set of their segments, we’ll form the basis of our repeating pattern.

Many different designs are possible from the same construction lines just by picking different segments. And the full pattern finally emerges when we create a grid with many repetitions of this one tile in a process called tessellation.

By choosing a different set of construction lines, we might have created this any of the above patterns. The possibilities are virtually endless.

We can follow the same steps to create sixfold patterns by drawing construction lines over a circle divided into six parts, and then tessellating it, we can make something like the above.

Here’s another sixfold pattern that has appeared across the centuries and all over the Islamic world, including Marrakesh, Agra, Konya and the Alhambra.

Fourfold patterns fit in a square grid, and sixfold patterns in a hexagonal grid.

Fivefold patterns, however, are more challenging to tessellate because pentagons don’t neatly fill a surface, so instead of just creating a pattern in a pentagon, other shapes have to be added to make something that is repeatable, resulting in patterns that may seem confoundingly complex, but are still relatively simple to create.

This more than 1,000-year-old tradition has wielded basic geometry to produce works that are intricate, decorative and pleasing to the eye. And these craftsman prove just how much is possible with some artistic intuition, creativity, dedication along with a great compass and ruler.

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“I don’t know anything with certainty, but seeing the stars makes me dream.”
Vincent Van Gogh

Representing what a radian is. For any of my followers who are taking math or physics classes, or are just curious.

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## Rihanna gave a math lessons to children in Malawi as part of her global project to educate children who can’t afford to learn - Like BRUT on FB to see more amazing content

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MARCH 11

My math notes were inspired by the flowers on my desk!

13.05.17 // Updated my physics window for the first time in ages! Had some thoughts over the past few weeks surrounding a free scalar field universe model so I drew them up as well as some old game theory because I watched a Beautiful Mind and felt nostalgic. I hope you are all having wonderful days / evening / whatever plane of existentialism you currently observe 😉

okay but real talk, lets just replace the course material used to teach mathematics in k-12 in the usa with the art of problem solving. everyone would be so much better for it. and its already written, theres no work involved.

JUST REPLACE THE FUCKING MCGRAW HILL BOOKS WITH THE ART OF PROBLEM SOLVING. burn the mcgraw hill books to the ground. set them all on fire. leave none of them unburnt. delete mcgraw hill from this earth.

i never considered doing a mathematics degree until I met a bunch of math majors in the same class as me, and realized they were just as bad at math as I was. then I was like well shit damn I can study whatever the fuck I want everyone sucks at everything.

Trigonometry.

18 • 04 • 2017

list of formulas i made for differentiation of functions :) I had my math quiz on this today haha and I didn’t even end up using half of them :’) ah well hopefully I’ll do well

Perspective matters

In school you are taught a lesson then given a test. In life, you’re given a test that teaches you a lesson.
—  Tom Bodett
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07.13.17

messy titles, but I got a lot done today :) plus i’m almost done with the first semester of my precalc course, and summer’s not even halfway over !!

worries bin

This shows that the probability of a random variable is maximum at the average and diminishes as one goes away from it, eventually leading to a bell-curve.