Here is a start at a glossary:

UD - The Universal Dovetailer, a hypothetical system for
running all possible computer programs.  See UDA.

UDA - The Universal Dovetailer Argument of Bruno Marchal, which
concludes that we must derive the laws of physics from computer science.
See http://www.escribe.com/science/theory/m3044.html.

Level 1, 2, 3, 4 multiverses - These are based on Max Tegmark's
hierarchy, described at http://www.hep.upenn.edu/~max/multiverse1.html.
Briefly, the level 1 multiverse consists of regions of space within
our universe that are beyond our observation horizon.  Level 2 is
the multiple bubbles of space predicted by inflation theory.  Level 3
is the Many-Worlds Interpretation of Quantum Mechanics (MWI).  Level 4
is the hypothesis that all mathematical structures exist and that some
of them can be though of as universes.

MWI - The Many-Worlds Interpretation of Quantum Mechanics, which holds
that at every quantum event the universe splits into parallel worlds.
See http://www.hep.upenn.edu/~max/everett.html for Tegmark's version.
Also see the level 3 multiverse reference for more links.


For the following, I don't have links, and my definitions may not be
quite right, so I invite corrections and links to definitions.


SSA - The Self-Sampling Assumption, which says that you should consider
yourself as a randomly sampled observer from among all observers in the
multiverse.

SSSA - The Strong Self-Sampling Assumption, which says that you should
consider this particular observer-moment you are experiencing as being
randomly sampled from among all observer-moments in the universe.

ASSA - The Absolute Self-Sampling Assumption, which says that you should
consider your next observer-moment to be randomly sampled from among all
observer-moments in the universe.

RSSA - The Relative Self-Sampling Assumption, which says that you should
consider your next observer-moment to be randomly sampled from among all
observer-moments which come immediately after your current observer-moment
and belong to the same observer.

Hal

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