Full Idea
Brody bases sortal essentialism on the notion of a property that an individual must possess throughout its existence if it possesses it at any time in its existence.
Gist of Idea
Brody bases sortal essentialism on properties required throughout something's existence
Source
report of Baruch Brody (Identity and Essence [1980]) by Penelope Mackie - How Things Might Have Been 7.1
Book Reference
Mackie,Penelope: 'How Things Might Have Been' [OUP 2006], p.119
A Reaction
Brody tends to treat categories as properties, which I dislike. How do you assess 'must' here? A person may possess a mole throughout life without it being essential.
Related Idea
Idea 15835 Wiggins's sortal essentialism rests on a thing's principle of individuation [Wiggins, by Mackie,P]