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
Positive real numbers excess has been reciprocated. For formula_15 the sequence terminates with an exact fractional expression of formula_16, and for quadratic irrational formula_16 the sequence becomes a periodic continued fraction. In the study of classical groups, for every formula_18, the determinant gives a map from matrices over the reals to the real numbers formula_19 Restricting to invertible matrices gives a map from the general linear group to non-zero real numbers: formula_20. Restricting to matrices with a positive determinant gives the map formula_21; interpreting the image as a quotient group by the normal subgroup relation expresses the positive reals as a Lie group.