What mechanism supports a white dwarf core against further collapse after a low-to-intermediate mass star dies?

Answer

Electron degeneracy pressure

A white dwarf is prevented from collapsing further by electron degeneracy pressure, a quantum mechanical effect based on the Pauli exclusion principle.

What mechanism supports a white dwarf core against further collapse after a low-to-intermediate mass star dies?
gravitystarprotostarpressurecollapse