Adjective
Able to be shown to hold with very high confidence via heuristic arguments, but not formally provable.
Usage- not-comparable
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More examples (1)
For the Collatz conjecture, as written in condensed form, the map is scaling by 1#47;2 or 3#47;2 with equal probability, so the expected growth factor is #92;sqrt#123;3#47;4#125;lt;1}. Thus, we may argue that the map should probviously cycle back to 1. Nevertheless, in a postscript, Conway wrote that the Collatz conjecture is very likely unsettleable.