Corona discharge the electron-liberation is a high-energy photon from an atom within the plasma body relaxing after excitation from an earlier collision. The use of ionized neutral gas as a source of ionization is further diminished in a negative corona by the high-concentration of positive ions clustering around the curved electrode. Under other conditions, the collision of the positive species with the curved electrode can also cause electron liberation. The difference, then, between positive and negative coronas, in the matter of the generation of secondary electron avalanches, is that in a positive corona they are generated by the gas surrounding the plasma
Lucky numbers of Euler Lucky numbers of Euler Euler's “lucky” numbers are positive integers "n" such that for all integers "k" with , the polynomial produces a prime number. When "k" is equal to "n", the value cannot be prime anymore since is divisible by "n". Since the polynomial can be rewritten as , using the integers "k" with produces the same set of numbers as . Leonhard Euler published the polynomial which produces prime numbers for all integer values of "k" from 1 to 40. Only 7 lucky numbers of Euler exist, namely 1, 2, 3, 5, 11, 17 and 41 . The