Proof — Dyson series and QED stability
Statement
Dyson’s perturbation expansion links time evolution to Feynman diagrams; his analysis shaped understanding of QED.
Formula
U = T exp(−i∫ H_I dt)
Source
Canonical lineament aligned with TANAAKK IAS Faculty Emeriti index (2026); consult specialist monographs for full proofs.
Domains
physics