ICPTSOHC 2020 : International Conference on Perturbation Theory, Second-Order and Higher Corrections is the premier interdisciplinary platform for the presentation of new advances and research results in the fields of Perturbation Theory, Second-Order and Higher Corrections. The conference will bring together leading academic scientists, researchers and scholars in the domain of interest from around the world. Topics of interest for submission include, but are not limited to:

• Perturbation theory in quantum mechanics
• Approximate Hamiltonians
• Applying perturbation theory
• Limitations
• Large perturbations
• Non-adiabatic states
• Difficult computations
• Time-independent perturbation theory
• First order corrections
• Second-order and higher corrections
• Effects of degeneracy
• Generalization to multi-parameter case
• Hamiltonian and force operator
• Perturbation theory as power series expansion
• Hellmann–Feynman theorems
• Correction of energy and state
• Effective Hamiltonian
• Time-dependent perturbation theory
• Method of variation of constants
• Method of Dyson series
• Strong perturbation theory