Sentence examples for problem have appeared from inspiring English sources

Several solution concepts for multiobjective optimization problem have appeared in the literature viz.

Recently, some existence results for fractional boundary value problem have appeared in the literature (see, e.g., [15 17]).

Since this problem has appeared quite recently, there may be something that requires therapeutic help.

Meanwhile another problem has appeared on some of the new models: yellow discoloration under the screen.

All recalled vehicles must be repaired, regardless of whether a problem has appeared, and there is no time limit on the repair.

But in the past two years, another problem has appeared: China is struggling to mine enough coal to satisfy all the coal-fired plants.

Relatively little work on this problem has appeared in the literature, see, e.g., [27], [28].

Urban problems have appeared.

The biggest problems have appeared in the biggest chains.

Many variants of both types of problems have appeared over the years.

Contrasting problems have appeared in the early stages of the season for Major League Soccer and the Women's United Soccer Association.