Copia di Sum over paths method
Demonstration of sum-over-paths or Path integral - powerful method of modern science.
Understanding of "integral" concept is'nt needed.
Based on material from R. Feynman' book "QED - The Strange Theory Of Light And Matter",
chapter 2, esp. pages 40 - 44.
Points A, B, M1, M2, C on Graphics 1 and phases on Graphics 2
are movable.