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 Reciprocal, $y=\frac{x-1}{x}$ and the Unit CircleThe tribonacci constant reciprocal 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 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