Lie-Admissible Invariant Origin of Irreversibility for Matter and   Antimatter at the Classical and Operator Levels
  It was generally believed throughout the 20-th century that irreversibility is a purely classical event without operator counterpart. However, a classical irreversible system cannot be consistently decomposed into a finite number of reversible quantum particles (and, vice versa), thus establishing that the origin of irreversibility is basically unknown at the dawn of the 21-th century. To resolve this problem, we adopt the historical an- alytic representation of irreversibility by Lagrange and Hamilton with external terms in their analytic equations; we show that, when properly written, the brackets of the time evolution characterize covering Lie-admissible algebras; we show that the for- malism has a fully consistent operator counterpart given by the Lie-admissible branch of hadronic mechanics; we identify catastrophic mathematical and physical inconsis- tencies when irreversible formulations are treated with the conventional mathematics used for reversible systems; and show that, when the dynamical equations are treated with a novel irreversible mathematics, Lie-admissible formulations are fully consistent because invariant at both the classical and operator level. The case of closed-isolated systems verifying conventional total conservation laws, yet possessing an irreversible structure, is treated via the Lie-isotopic subclass of Lie-admissible formulations. The analysis is conducted for both matter and antimatter at the classical and operator levels to prevent insidious inconskistenmcies occurring for the sole study of matter or, separately, antimatter, as known known for the problem of grand unificationsr. 
Ruggero Maria Santilli