Recursive Z4 Phase Structure and Quadratic Stability as a Combinatorial Origin of Quantum Propagators

Key Points

• The aim is to establish a clearer understanding of the recursive Z4 phase structure and its role in the stability of quantum propagators.
• Total rewrite of previous versions for clarity.
• Enhanced mathematical exposition and examples provided.
• Improved clarity of progression in the exposition.
• Strengthened explanation of quadratic stability.