Measurements are ‘Actual Selections’
Actual measurements are selections of alternate histories
- Unphysical alternatives actually removed by some (undiscovered) dynamical process.
- This sets to zero any residual coherence between nearly-decoherent histories, if a branch disappears.
Different alternatives ui often summarised by an operator A of which they are distinct eigenfunctions: Aui = ?i ui, and labeled by some eigenvalues ?i .