The Closest-Continuer schema is a theory of identity according to which identity through time is a function of appropriate weighted dimensions. A at time 1 and B at time 2 are the same just in case B is the closest continuer of A, according to a metric determined by continuity of the appropriate weighted dimensions.
I don’t think that I fully agree with it but it’s interesting to think about
Not just math but actual maths
That’s like math^2