Ideas from 'The Nature of Existence' by J.M.E. McTaggart [1927], by Theme Structure

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7. Existence / B. Change in Existence / 1. Nature of Change
Change is not just having two different qualities at different points in some series
27. Natural Reality / A. Space-Time / 2. Time / a. Time
The B-series must depend on the A-series, because change must be explained
A-series uses past, present and future; B-series uses 'before' and 'after'
For McTaggart time is seen either as fixed, or as relative to events
A-series expressions place things in time, and their truth varies; B-series is relative, and always true
27. Natural Reality / A. Space-Time / 2. Time / e. Existence of time
Time involves change, only the A-series explains change, but it involves contradictions, so time is unreal
There could be no time if nothing changed