The three Pauli spin matrices σi (i = 1, 2, 3) occur in the mechanical, especially quantum mechanical, theory of rotation in three-dimensional space. The three spin matrix exponentials are here ...

In the early 1920s, physicists were first working out the mysteries of the quantum Universe. Particles sometimes behaved as waves, with indeterminate positions, momenta, energies, and other properties ...

Although elusive, the quantum spin has led to some of the deepest insights we now know. Quantum mechanics has a lot of weird stuff - but there are things that everyone agrees that no one understands.

The fact^H^H^H^Hopinion that The Matrix Reloaded is a lumpy and uneven movie aside, I do have to admit that the universe created by the Wachowskis is intriguing. Not to mention marketable. We've ...

Wolfgang Pauli was one of the central figures in the history of twentieth-century science. His discovery of the exclusion principle in 1924 provided the essential foundation for the development of ...