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Full Idea
Necessities supervene upon everything, but they do not depend on everything.
Gist of Idea
Necessities supervene on everything, but don't depend on everything
Source
David Liggins (Truth-makers and dependence [2012], 10.4)
Book Ref
'Metaphysical Grounding', ed/tr. Correia,F/Schnieder,B [CUP 2012], p.261
A Reaction
I'm not sure if merely existing together counts as sufficiently close to be 'supervenience'. If 2+2 necessitates 4, that hardly seems to 'supervene' on the Eiffel Tower. If so, how close must things be to qualify for supervenience?