The phrase "a single class of problems" is correct and usable in written English.
It can be used when referring to a specific category or type of problems that are being discussed or analyzed.
Example: "In our research, we focused on a single class of problems that pertain to algorithm efficiency."
Alternatives: "one category of issues" or "a specific type of problems."
We excluded a further 25 that only focused on a single class of illness (for example, orthopedic problems), 14 that only provided medical advice (for example, what symptoms are typically associated with a certain condition) and did not provide diagnosis or triage advice, and two that were not working.
In[16], we addressed several of those problems in a new queueing model for a single class of CR traffic for general operating and interruption period lengths.
The problem with considering the endocrine tumors as a single class of tumors is that other than a common function (i.e. hormone secretion), tissues of the endocrine system my have nothing in common morphologically, genetically, or developmentally.
This widespread use of a single class of insecticide could result in development of more insecticide resistance in the mosquito vectors and lead to a major public health problem given the limited availability of alternative insecticides [ 9].
After major classes were determined, some utility classes were created to help present primary classes, of which a single class is insufficient to present the hierarchical behavior.
Based on the results of a large number of computational experiments we show that the proposed method outperforms both the OCSVM for a single class, as well as the multi-class SVM for multi-class classification problems.
In this study, to avoid extreme case problems [ 14], litters of more than three lambs were clustered into a single class.
However, instead of treating each class separately, we grouped all classes into a single class.
