in reply to The best "true zero" is...
Surely the best definition of true zero is "Sigma (everything) == 0". Where everything includes all real, rational, irrational, transcendental and imaginary numbers, concepts, thought processes, definitions of zero, snippets of code, people, things, space, vacuums, natures abhoring vacuums, lumps of rock, B list movie stars etc etc etc. Otherwise you imply that existance actually has a starting point (and where did that starting point come from ... ) (and where did that starting point starting point come from ....) onto infinity ... rather than being either just there or illusionary or pre-determined. Personally I like Larry's ("0 but true") statement as a good description of existence.