Prog = odd timings and chord progressions in the context of traditional songwriting.
Post Rock = odd timing and chord progression in the context of doing the opposite of what a traditional songwriter would (usually ends up meaning its just really slow and droning...though there are exceptions)
Math Rock = Odd timing and chord progression with absolutely no regard for traditional songwriting...the math writes the music, basically.
Other people may have other opinions on this, but that is how I distinguish them in my head.
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Confusion will be my epitaph...
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