The phrase "a number of intractable" is correct and usable in written English.
It can be used when referring to several difficult or unsolvable issues or problems.
Example: "The committee faced a number of intractable challenges that hindered their progress."
Alternatives: "several unresolvable" or "many persistent".
Utility estimation relies on forming particle approximations to a number of intractable integrals which is afforded by the use of the sequential Monte Carlo algorithm for Bayesian inference.
Otto found himself confronted by a number of intractable ecclesiastical issues: 1) monasticism, 2) Autocephaly, 3) the king as head of the Church and 4) toleration of other churches.
7 The positive deviance approach originated within international public health literature 8 and has been used to address a number of intractable problems such as female genital mutilation and infection avoidance in drug users.
And since the region is riven by any number of intractable disputes the Koreas, Taiwan, Kashmir and the South China Sea are just a few meaningful integration seems a very long way off.
The Camp David meeting in July pointed toward progress on a number of previously intractable issues.
Finally, rats and mice are not able to show one particular symptom of NMO that may herald the formation of optic neuritis and transverse myelitis in a number of affected patients: intractable vomiting 2, 46.
A number of explanations for the intractable rate of maternal mortality that continues to bedevil the world are suggested – but poverty is left out.
Since finding the optimal solution in a reasonable time for medium to large-sized problems is intractable, a number of researchers have considered developing meta-heuristics to compute near-optimal solutions.
The malignant disorder, myeloma, is characterized by extensive bone destruction, which is manifested by a number of important clinical features including intractable bone pain, fractures that occur either spontaneously or following trivial injury, and hypercalcemia, which can be life-threatening.
Mullah Omar, however, has proved stubborn and intractable across a number of years and settings.
This project encountered a number of problems that have seemed so intractable as to lead some philosophers, particularly Quine, to doubt the reality of the distinction.
