An exhaustive essence would permit resolution of all borderline cases, but Kripke-Putnam frameworks generate systematic indeterminacy in cases like isotopes, newly synthesized compounds, and species hybrids.

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Borderline cases(The unclear middle ground between definite heaps and definite non-heaps): Situations where it's genuinely unclear whether a label applies—like wondering if 500 grains of sand count as a heap or not.
Exhaustive essence(as used in metaphysics): A complete list of all the properties that perfectly define what something is, with no gray areas or ambiguity left over.
Isotopes(as used in chemistry/science philosophy): Versions of the same chemical element that have different numbers of neutrons, making them slightly different in weight and behavior.
Kripke-Putnam frameworks(as used in philosophy of language and metaphysics): A pair of related theories about how we name and understand natural things (like elements or species); they argue that what something *is* depends partly on hidden facts about nature, not just what we can observe.

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