Inside Black Holes, Singularity or Complementarity?

Through two exact solution families to the Einstein equation and the one-to-one correspondence between their free parameters, we show that the ensemble of collapsars with only close-to-implementing horizon in the Schwarzschild time definition and the over-cross-oscillatory solid-balls in the Lemaitre time definition constitute two complementary description for the microscopic state of black holes formed through gravitational collapse. We quantise the solutions in the Schwarzschild time definition and show that the area law formula of Bekenstein-Hawking entropy follows naturally from the wave-functional's degeneracy of the collapsing materials. In two companion works, supports from the gravitational wave of binary merger observation and predictions for the fast radio burst of single body perturbations of this complementarity will be reported independently.