This is a Multivibrator with Schmitt trigger according to:
U. Tietze and C. Schenk, Halbleiter-Schaltungstechnik (German), 11th edition, Springer 1999, Chapter 6.5.3
As the initialization system has two solutions, one with the op
amp output at the lower saturation limit, and the other one with
the two voltage inputs very close to each other, the
homotopyType
parameter is set to get the solver to
converge to the former one, which is the required solution.