Summary
We present a visual proof that .
Disclosure statement
No potential conflict of interest was reported by the author(s).
Additional information
Notes on contributors
Ángel Plaza
Ángel Plaza (MR Author ID: 350023) received his masters degree from Universidad Complutense de Madrid in 1984 and his Ph.D. from Universidad de Las Palmas de Gran Canaria in 1993, where he is a Professor in Applied Mathematics. He is interested in mesh generation and refinement, combinatorics, and visualization support in teaching and learning mathematics.