History

The only other works use methods of Dole~(1970).
(also see Isaacman & Sagan~1977)

• Injected Embryos into a nebula of gas and dust.
  • One at a time.

• Initially accretes solids. But, accretes gas if massive enough.

• Planets merge if on crossing orbits.

But,

• Planetary embryos and planets did not gravitationally interact.

• These systems are unconstrained by dynamics.
  • May be unstable.