Gregory's ex suppositione framework smuggles in temporal indexing that presupposes a fixed timeline, begging the question against open future theorists like Peter Auriol who denied determinate truth-values for future contingents.

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ex suppositione(describing the specific logical framework being critiqued)

A Latin phrase meaning 'by supposition'—a medieval logical technique for analyzing what words refer to or stand for in different contexts.

fixed timeline(what temporal indexing presupposes according to the argument)

The idea that the past, present, and future are all equally real and determined, like points on a line that already exist.

future contingents(Łukasiewicz's three-valued logic)

Propositions about future events whose truth-value is undetermined, such as F(x)q and F(x)~q

open future theorists(the opposing philosophical position being discussed)

Philosophers who believe the future is genuinely open and not yet determined—what happens next hasn't been settled yet.

temporal indexing(the hidden assumption the critic claims Gregory's framework contains)

A way of marking statements as true or false depending on *when* they are said—like how 'it is raining' is true at some times but not others.

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