The difficulty of this experiment is extraordinary.
When this new difficulty of the negative energy states appeared it was an example of a difficulty that was not really new; it was there all the time.
Nevertheless, learning algorithms can give insight into the relative difficulty of learning in different environments.
The difficulty of diagnosing HIV in infants, however, remains a major impediment to progress.
In difficulty of learning, music lies somewhere in between speaking and writing.
One of the challenges of this technology is the difficulty of coupling two of the NV centers in separate nanocrystals of diamond.
In the past the main problem with asynchronous induction motors was the difficulty of varying their speed.
The difficulty of defining financial stability and the plethora of potential tools means central bankers will, in future, have much more discretion.
Diplomacy and foreign assistance are often underfunded and neglected, in part because of the difficulty of demonstrating their short-term impact on critical challenges.
The difficulty of monitoring such travel would prove immense: one can already foresee the host of business people taking their flights from Paris.
The report also warned that the difficulty of managing these tricky and often countervailing trends means that the threat of trade wars has not disappeared.
Midway through my nearly six-year tenure as a dean, I once griped to a friend about the frustrating difficulty of making even small changes.
Often, says Schneider, "these are parents who are leading very, very difficult lives with all kinds of horrifying problems to deal with, and the child is only part of the difficulty of their lives.
While this doesn't sound like a big deal, the difficulty of factoring and finding a discrete logarithm forms the basis of most if not all public-key cryptography systems.
Hobbes may, I think, overestimate or maybe I really should say underestimate the difficulty of the book but he returns to this again at the very end of Leviathan.
From the beginning, the cloud hanging over the whole hydrogen enterprise has not been the power source as such, but the intractable difficulty of distributing and storing the stuff.
