For an artist, how to comment on this state of affairs without risking infringement remains an unsolved — perhaps unsolvable — problem.
It's a mystery as unsolvable as the one Kristin Scott-Thomas recently gestured toward, when she complained about mostly being asked to play unpleasant ice queens).
According to Ivana Prica, an economist at Belgrade University, the other "burning, unsolvable long-term issue" besides unemployment is Serbia's unsustainably high trade deficit which is swelling the country's foreign debt.
Ivana Prica, an economist at Belgrade University, says the other "burning, unsolvable long-term issue", besides unemployment, is financing Serbia's big trade deficit.
An unsolvable problem of the past might not seem like fertile ground for debate.
Thus, the problem of subdividing a square into smaller squares, no two of which are alike, which was long thought to be unsolvable, has been solved by the means of network theory.
Some critics of symbolic AI believe that the frame problem is largely unsolvable and so maintain that the symbolic approach will never yield genuinely intelligent systems.
He utilized koans (unsolvable riddles) to aid meditation and invented the well-known paradox of contemplating the sound of one hand clapping.
For other systems it can be proved that no decision procedure is possible; the decision problem for such a system is then said to be unsolvable, and the system is said to be an undecidable one.
As a result of the development of recursion theory, it is now possible to prove not only that certain classes of problems are mechanically solvable (which could be done without the theory) but also that certain others are mechanically unsolvable (or absolutely unsolvable).
Hence, given the unsolvability of the halting problem, it follows that, even for the simple class of sentences in the predicate calculus having the quantifiers ∀ ∃ ∀, the decision problem is unsolvable.
