def
definition
def or abbrev
momentumPointer
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94def momentumPointer : PointerState := {
proof body
Definition body.
95 observable := "momentum",
96 selection_reason := "Translation-invariant interactions favor momentum states"
97}
98
99/-- **THEOREM (Einselection)**: The environment selects pointer states.
100 In RS: environment imposes J-cost that selects classical basis. -/