Without a privileged partition, the symmetry argument for...

Formal framework(as the coherent structure containing ε₀): A precise system of symbols, rules, and definitions that allows you to make logical arguments without ambiguity, like a game with explicitly stated moves.
Symmetry argument(as used in arguments about the harm of death): An argument that says if two situations are mirror images of each other in relevant ways, they should be treated the same way—in this case, the time before you were born and the time after you die should be viewed identically.
a priori probabilities(epistemology (how we know things)): Chances or likelihood of something being true that we can figure out just by thinking about it, before we look at any real-world evidence.
privileged partition(metaphysics and logic): A special way of dividing up or grouping things that has a good reason for being the 'correct' way, rather than one choice among many equally valid options.
rightmaking properties(explaining what makes an action ethically justified): The features or characteristics of an action that make it morally right or good.
wrongmaking properties(explaining what makes an action ethically problematic): The features or characteristics of an action that make it morally wrong or bad.

1 topic

Without a privileged partition, the symmetry argument for equal a priori probabilities between rightmaking and wrongmaking properties is undermined by the very formal framework it invokes.