The phrase "a difficult problem involving" is correct and usable in written English.
You can use it when discussing a complex issue that requires consideration of multiple factors or elements.
Example: "The researchers faced a difficult problem involving the integration of various data sources to achieve accurate results."
Alternatives: "a challenging issue concerning" or "a complex situation related to".
Examples of the resolving power of the method are given for a set of difficult problems, involving the collision of two strong shocks, the strong shock-tube test, and the interaction of two blast waves.
Many conceptual difficulties that have been reported in the research literature were not as prevalent for our participants and some of them were capable of solving difficult problems involving composition of functions.
Carter hopes that the teams at the NASA event will come up with similarly creative ideas for solving more difficult problems involving data and space travel.
What I object to about Mr. Parry's approath Is not the fact that be applies concepts of legitimacy and reflects them in his vocabulary, but that he shows no awareness that this Is what he is doing or that there are difficult problems involved in the relations between authority and violence.
In particular, we outline a variety of projects involving academic-journal collaborations: these are the first seedlings of much-needed community publisher engagement, which we hope will blossom into more and wider alliances to tackle the very difficult problems involved.
Computationally intensive Bayesian method was applied to small-scale trees, including a difficult phylogenetic problem involving worm Smads.
It is a difficult problem because the molecular descriptors involved with the inverse-QSAR algorithm must adequately address the forward QSAR problem for a given biological activity if the subsequent recovery phase is to be meaningful.
Chad Vecitis, an associate professor of environmental engineering at Harvard University, not involved in the Princeton project, said that eutrophication can pose a difficult problem for certain waterways.
It is a difficult problem.
