We mentioned him earlier: Truth Engineering, anew (consciousness as a state of matter).
We have brought up the quasi-empirical concerns, often, over the years. There looks to be a new framework with which to address these, one more time (recurrent theme).
- See Wolfram for a a good list of undecidable states.
- Wikipedia has a list, too, by type.
- It might help, too, to consider unsolved problems (while noting those that are not considered to be solved).
Remarks: Modified: 01/26/2015