In 1667, Gottfried Leibniz, who would later become a well-known mathematician and philosopher, wanted to join a society of alchemists. He compiled a letter from the writings of the most celebrated alchemists and sent it to the society. The letter consisted of the most obscure terms Leibniz could find, and he himself, he said, did not understand a word of it. Afraid to be thought ignorant, the society invited Leibniz to its meetings and made him secretary.

A new entry in my beautiful geometry theorem series: Poncelet’s closure theorem.

Given two circle (or conic) on the plane. If you can draw an n-gon such that the vertices are on one of the circles and the sides are touching the other circle, then there is infinitely many such n-gon. Furthermore each point of the outer circle is a vertex of one of these n-gons.  

 https://en.wikipedia.org/wiki/Poncelet%27s_closure_theorem

Hey Tumblr, I have a math question. I don’t know the answer and I’m hoping that someone will be able to answer it or point me in the right direction. But I think some people might find it interesting to think about regardless.

Code:

// Fragment shader
precision highp float;

varying vec2 UV;
varying vec3 v_position;
uniform float time;
uniform float ratio;
uniform vec2 mouse;

void main(void){
    float x = UV.x * ratio;
    float y = UV.y;

    vec4 col = vec4(0.0);

    vec2 pos = vec2(x,y);

    col.r = 1.0;

    float r = length(pos-vec2(0.5,0.5));

    r += 0.5 * pow(cos(4.0 *y + x-0.5),2.0);

    col.r *= r;

    col.r *= cos(40.0 * r + 2.0 * 3.1416 * time);

    if(col.r > 0.04){
        col.r = 1.0;
    } else {
        col.r = 0.0;
    }

    col.a = 1.0;

    gl_FragColor = col;
}

Made with: http://a-mo-pa.com/stuff/shadergif/

Well hello everybody!! I’m back and more unmotivated than ever.
Since I have about 10 exams on October I thought about doing this challenge.
31 days of intense studying to put us on track and get good grades because of our hard work.
What you’ll have to do:

Make a post introducing you/your blog, telling us why youre doing the challenge, etc (tag #intenseoctober)
Update us whenever you want about how your studying is going (dont forget to tag #intenseoctober)
If you want you can follow other blogs who are doing the challenge.
At the end of the month you can tell us if it worked for you or not.

IF YOU WANT TO JOIN US YOU CAN SEND ME A MESSAGE TO ADD YOU TO THIS LIST SO EVERYONE CAN FOLLOW YOU.
ALSO TAG YOUR POSTS WITH #INTENSEOCTOBER
Reblog this post to spread the challenge!!!

You should always order the bigger pizza. While an 8“ pizza is roughly 50 square inches, a 16” pizza is 200 square inches, which is 4 times bigger but most pizza places charge by radius and don’t consider the overall area of the pizza. An NPR study found that one 20” pizza is actually bigger than two 14” pizzas, but is also, on average, $9.00 cheaper. Source

Let’s talk about this scene in Ghostbusters…                                                   

So at first glance this is just some maths/physics gobbledegook on a whiteboard that looks cool but then you look closer…

See it yet?

HOW ABOUT NOW? 

It says [Pa/RA(NO+RM)alS+UD1ies/Lab]com

AND IF YOU PUT THAT INTO YOUR REGULAR OL’ GOOGLE:

SOME SORT OF OFFICIAL GHOSTBUSTERS WEBSITE THING I KID YOU NOT.

Here’s the link of you’re a lazy fucker: http://www.paranormalstudieslab.com/#/

(Also those calculations were apparently examined by some dudes at MIT so something in there is legit IDK)

10

Complex Wooden Book Reveals Story with Solving Stages Of Puzzles

Industrial designer Brady Whitney designed an innovative puzzle, Codex Silenda, in the form of a book, which can only be unlocked and read once the puzzle is solved. The brain wracking device is diabolically complex book composed of laser cut wood panels that have mechanical keys to unhinge. 

Keep reading

Hey guys! So I decided to put a complete math masterpost (algebra 1, geometry, algebra 2, trigonometry, pre-calculus, and calculus) together for all of you kids in high school like me! 

ALGEBRA l //

cheat sheet here

free online textbook

resources to go along with a textbook

some practice problems

another algebra cheat sheet

one more cheat sheet

GEOMETRY //

online textbook for free here (hover to see the table of contents)

resources to go with the textbook

khan academy

cheat sheet

and another cheat sheet

some video lessons

practice problems

amazingly helpful post by @etudiance here!!!

tips and tricks

test practice

general tips

multiple choice practice

standardized test practice

the textbook I used when I took geometry last year + the username is ILOVEMATH9 and the password is ILOVEMATH

ALGEBRA 2//

my recent post on algebra 2 here

TRIGONOMETRY//

free online trig textbooks

trig cheat sheet

sheet with trig functions and definitions

learn how to do trig

trig problem solver

another trig problem solver

trig problems with solutions

more trig practice

standardized trig practice

PRE-CALCULUS//

practice problems

pre calc cheat sheet

resources for students

free online textbook

another free online textbook

this post by @attackonstudying

this post by @etudiance

this post by @productivityjunction

this post by @themathblrs

another post by @etudiance

precalc tips

khan academy precalc youtube channel

another precalc youtube channel

and another precalc youtube channel

CALCULUS//

free online textbook

another free online textbook

this post by @angestudies

this post by @cherrypikkins

this post by @munirastudies

this post by @studygene

some tips

calculus cheat sheet here

more calculus tips

how to ace calculus

tips for success in calculus

calculus exam tips

SOME POSTS WITH GENERAL MATH TIPS//

a post on success in any math class by @humanlties

a post on math tips in general by @thepoisonivyleague

post with helpful sites for math by @mathbrain

a post with general math tips plus resources for algebra 1, algebra 2, geometry, trigonometry, and calculus by @studybuzz​

and that’s all! I hope this was helpful to someone! Good luck with all your classes and see you next time! hugs, mel