The phrase "a problem previously" is correct and usable in written English.
It can be used when referring to an issue that has been encountered or discussed at an earlier time.
Example: "We need to address a problem previously identified in our last meeting regarding the project's timeline."
Alternatives: "an issue earlier" or "a concern mentioned before".
He said: "We have had a problem previously with [Roberto] Martínez – I think he was slightly over the top.
Women have been turning up at hospitals with a problem previously only observed in men: exploded bladders.
In this paper, a recently developed numerical upper bound method, the Linear Matching Method (LMM), for shakedown analyses is applied to the solution of a problem previously considered by Ponter et al. [Ponter, A.R.S., Hearle, A.D., Johnson, K.L., 1985. J. Mech. Phys. Solids 33 (4), 339 362] for a moving Hertzian contact, with sliding friction.
The latter is a problem previously identified with iTRAQ based quantitative proteomics [ 34, 35].
At the same time, the isolation of services and their fragmentation have been identified as a problem previously without being overcome.
We state the agreement problem between a taxonomy and a phylogeny in terms of an "subcoloring" problem previously described in the computer science literature [ 3, 4].
"Countries that have a radicalization problem previously had to rely on ad hoc support from wealthier donor nations, many of which are not bureaucratically capable of sponsoring the small intervention programs necessary to disrupt the radicalization process," said William McCants, a former State Department counterterrorism official who is now a fellow at the Brookings Institution.
This is a common problem previously described in various plant studies (Mazars et al. [1991]) and it is likely caused by illegitimate recombination events that also occur during fungal transformation (Choi et al. [2007]).
A specific problem previously studied by different researchers using genetic algorithms (GA) and Tabu search (TS) was chosen as a test-case to characterize the computational efficiency and the quality of results provided by the developed ACO algorithm.
We have formalized the question of describing the discordance of a phylogenetic tree with its taxonomic classifications in terms of a convex subcoloring problem previously described in the literature.
The proposed optimization method is applied to a core design optimization problem previously solved with Genetic and Particle Swarm Intelligence Algorithm.
