Given two arbitrary elliptic orbits around an ideal single point mass, there will always exist a transfer with the minimal $\Delta v$ required.
It's easy to find an upper bound for this ideal transfer:
$$\Delta v = \sqrt{\frac{2\mu}{r_{P1}}} - v_{P1} + \sqrt{\frac{2\mu}{r_{P2}}} - v_{P2}$$
Thi...
Given two arbitrary elliptic orbits around an ideal single point mass, there will always exist a transfer with the minimal $\Delta v$ required.
It's easy to find an upper bound for this ideal transfer:
$$\Delta v = \sqrt{\frac{2\mu}{r_{P1}}} - v_{P1} + \sqrt{\frac{2\mu}{r_{P2}}} - v_{P2}$$
Thi...