# math

2022 November 27

$2 \! \times \! 2$ Matrix Eigenvector FormulasA shortcut for finding the eigenvectors of a $2\times2$ matrix.

2020 January 18

Tribonacci Constant Conjugate, $y=\frac{x-1}{x}$ and the Unit CircleThe tribonacci constant conjugate makes an appearance at the intersection of $y=\frac{x-1}{x}$ and the unit circle. Also a geometric construction by Xerardo Neira.

2019 December 17

Golden Diagonals and Fibonacci NumbersJust an interesting coincidence between diagonals of golden rectangles and Fibonacci numbers.

2019 December 16

Polygons and Metallic MeansThe golden mean is found in the pentagon. Silver mean in the octagon. But what about the other metallic means?

The Family of Metallic Means

by Vera W. de Spinadel