Essentially Undecidable

Some articles on undecidable:

Decidability (logic) - Some Undecidable Theories
... Some undecidable theories include (Monk 1976, p ... of semigroups and the theory of rings are undecidable ... Robinson established in 1949 that the theory of fields is undecidable ...

Famous quotes containing the word essentially:

    We find ourselves under the government of a system of political institutions, conducing more essentially to the ends of civil and religious liberty, than any of which the history of former times tells us.
    Abraham Lincoln (1809–1865)