Mathematical Physics - Quantum-Relativity (qr)

The Gaussian-School of Higher-Arithmetic (1831, updated 2022); tutorial #1.

The greatest mistake ever made in the history of all human logical thinking.

Any so-called "mathematician" who could not see beyond the patent nonsense in the Euler Identity (that is everybody except JCF Gauss) was not even a useful arithmetician, let alone a colleague of Laplace or Fourier. Think about this another way, whatever we do in life, even if one is a mathematician oneself, for about the last  200-years we have all been accidentally hypnotised (or indoctrinated) into learning a lot of arithmetical claptrap from pathetic "mathematics" teachers and professors who had never even been taught how to count properly.