The development of logarithms in 1594 by Napier and independently by Bürgi about 1600 marked the beginning for discovering the natural base of logarithms, the special irrational transcendental constant e, numerically equals 2.71828 18284 59045 23536 0287 … by Euler in 1728, in an unpublished manuscript (Opera Posthuma, 11, 800-804).
It was well known by many mathematicians which include Newton, Leibniz, and Euler that the theory of convergent infinite series could be of service for working with differential and integral calculus and for finding special constants and quantities, such as p, e, as well as logarithmic and trigonometric functions. However, the ultimate exponential power of e lies within its differentiable manifolds, both real and complex domains.
Since then this number appeared practically everywhere: from the growth of financial bank accounts to the radioactive decays of matter, from calculus to probability theory, from Maxwell’s electromagnetism to the wave equation of quantum mechanics, and now as the complex phase factors of quantum field theory.
More recently, 1984, Cahn, at the University of California in Berkeley, wrote (http://www-physics.lbl.gov/~rncahn/book.html) semi-simple Lie algebras and their representations by re-introducing finite rotation as exponentials of negative complex 3 by 3 matrices. The reason for the negative complex exponentials is the fact that they are cyclic differentiable with increasing powers of the modulus analogous to an outward spiral. All these are done for the purpose of preserving the local gauge invariance of vector representations of infinitesimal rotations. However, the commutative invariance of infinitesimal rotations could still be achieved by alternatively using real Hadamard matrices, which could also describe quantum of spacetime, quantum of charge (electric, weak, and color) as well as quantum of mass.


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