hypercube example

[fibo]

Use ℍ for quaternions

Add an example, instead of calculations, with an hypercube

Vertices can be generated with

let points = []

[0.5, -0.5].forEach((x, i, array) => {
  array.forEach(y, i, array) => {
    array.forEach(z, i, array) => {
      array.forEach(w, i, array) => {
        points.push([x, y, z, w]
      }
    }
  }
})

Then show that its points are a group, by multiplying them.