The phrase "a problem by which" is correct and usable in written English.
It can be used to describe a problem that is defined or characterized by a specific condition or situation.
Example: "The study identified a problem by which many students struggle to keep up with the curriculum due to a lack of resources."
Alternatives: "an issue that arises from" or "a challenge caused by".
It could take 10 years to cause a noticeable problem, by which time the changes are irreversible.
With the objective and the constraints identified, the security-constrained line loss minimization problem can be translated to an OPF problem, by which the value of (Delta dot{I}_{U}^) can be determined.
These stiffened structures create a complex engineering problem by which they must be designed to have the lowest cost and mass and yet withstand loads.
Turns out it has a rare overheating problem, by which these warnings usually mean explosion problem.
This approach provides a fruitful source of research problems by which optimal M&V plans under various practical constraints can be determined.
However, under this approach is is not clear what to do with SNPs which are simultaneously "hits-by-proxy" and "nulls-by-proxy", a problem which is avoided by our approach.
In addition to solving problems provided by a teacher or textbook, problem posing, by which learners create problems, has also been identified as an important activity in mathematics education.
These indications are, for example, the amount (or absence of) alternative solutions to a problem, the degree by which a theory is connected to already confirmed theories, and the amount of unexpected insights that the theories give rise to.
"With nearly a third of the planet affected in some way by a problem for which a clear solution exists, anything less than rapid progress is unconscionable".
Online interval selection is a problem in which intervals arrive one by one, sorted by their left endpoints.
