# Category Archives: Euler

## Euler Diagram

This article is about Eulerian circles of set theory and logic. For the geometric Euler circle, see Nine-point circle. An Euler diagram illustrating that the set of “animals with four legs” is a subset of “animals”, but the set of … Continue reading

Posted in Euler, John Venn, Venn | Tagged , , | 5 Comments

## Coffee and Donut?

A continuous deformation (homeomorphism) of a coffee cup into a doughnut (torus) and back. Similarly, the hairy ball theorem of algebraic topology says that “one cannot comb the hair flat on a hairy ball without creating a cowlick.” *** This … Continue reading

## The Whole World is a Stage

Euler product formula Now you must know what sets my mind to think in such abstract spaces. “Probability of seeing a stage in a concert.“ All The World’s A Stageby William ShakespeareFrom: As you Like It, Act II Scene VII … Continue reading

## Euler’s Konigsberg’s Bridges Problem

“Liesez Euler, Liesez Euler, c’est notre maître à tous”(“Read Euler, read Euler, he is our master in everything”) – Laplace I should say here that the post by Guest post: Marni D. Sheppeard, “Is Category Theory Useful ?” over at … Continue reading

## Lingua Cosmica

It looks as though primes tend to concentrate in certain curves that swoop away to the northwest and southwest, like the curve marked by the blue arrow. (The numbers on that curve are of the form x(x+1) + 41, the … Continue reading

## Mersenne Prime: One < the Power of two

It looks as though primes tend to concentrate in certain curves that swoop away to the northwest and southwest, like the curve marked by the blue arrow. (The numbers on that curve are of the form x(x+1) + 41, the … Continue reading

## A New Way of Seeing?

Sorry couldn’t resist. How many before us in our speculations and way of seeing? 🙂 When looking at Gaussian coordinates, the very idea that our views of “length of lines” had to have another way in which to interpret how … Continue reading

Posted in Brain, Euler, Riemann Hypothesis, Topology | Tagged , , , | 1 Comment

## Grue and Bleen

Brian Greene: In the late 1960s a young Italian physicist, named Gabriele Veneziano, was searching for a set of equations that would explain the strong nuclear force, the extremely powerful glue that holds the nucleus of every atom together binding … Continue reading