Full Idea
Contrasted with variable powers are those powers which cannot be diminished or augmented without loss of identity for the particular to which they are ascribed.
Gist of Idea
Some powers are variable, others cannot change (without destroying an identity)
Source
Harré,R./Madden,E.H. (Causal Powers [1975], 9.I)
Book Reference
Harré,R/Madden,E.H.: 'Causal Powers: A Theory of Natural Necessity' [Blackwell 1975], p.162
A Reaction
They give the example of a Deputy Sheriff's powers, as one that cannot vary. I suppose the powers of an electron are in the fixed category. Fair enough. Can a fundamental power be variable (or only 'complex' powers)?