In the remaining years of his life, Bell devoted a lot of time to exploring flight,
starting with the Tetrahedral kite in 1890s.
The fourfold Cauchy product of 1- 1 + 1- 1 +… is 1- 4 + 10- 20+… ,
the alternating series of Tetrahedral numbers, whose Abel sum is 1⁄16.
In water, intermolecular Tetrahedral structures form due to the four hydrogen bonds,
thereby forming an open structure and a three-dimensional bonding network, resulting in the anomalous decrease in density when cooled below 4 °C. This repeated,
A molecule in diamonds is made up of five carbon atoms which
are connected to each other to create a strong Tetrahedral unit, which results in a strong molecule
and the source of the hardness of the diamond.