grandfather clause

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Related to grandfather clauses: Grandfathered in
Any policy or rule that exempts a group of individuals, organizations, or drugs from meeting new standards or regulations—e.g., when a new subspecialty board in internal medicine is created, the physicians practising in that area may be ‘grandfathered’ into the subspecialty and not required to meet residency or other educational requirements

grandfather clause

Any policy or rule that exempts a group of individuals, organizations, or drugs, from meeting new standards or regulations; eg when a new subspecialty board in internal medicine is created, the physicians practicing in that area may be 'grandfathered' into the subspecialty and not required to meet residency or other educational requirements
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Corollary: The value of the grandfather clause, G(|Delta~), is given by
Thus, the value of the grandfather clause in this region is the value given in Claim 2 minus the value given in Claim 1 plus |Delta~ plus K.
Figure 1 illustrates the value of the grandfather clause as a function of |Delta~.