Dear Mark,
I am suggesting what most people try to avoid: Let there be a higher time parameter along which history may be rewritten.
Let’s deal the immediate concern first: Wouldn’t that higher time necessitate yet another higher time and so on ad infinitum? I suggest not to worry too much at this stage. Here is a soothing hint from cos…[Read more]

Thank you for your helpful comments and the important issues they raise.
As Eli and I are now commenting separately, we can allow ourselves to diverge somewhat from the essential points of agreement on which our papers are based. So this is also a dialogue between the authors.
Indeed, both TI and TSVF seem to be more compatible with the Block…[Read more]

Trying again, compressed…

My talk in Capetown – PPT

Dear Mark,
Many thanks for your helpful reading, now properly acknowledged, from the silly typoes now corrected to the foundational issues, on which let’s initiate a discussion.
(BTW I didn’t succeed yet to replace the old version with the new one, so in the time being please ignore the old one and address only this version:…[Read more]

Here is the new version – please ignore the previous one.