Sentence examples for problems have appeared from inspiring English sources

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.

Cementless metal-back acetabular cups have good long-term results, but some problems have appeared due to the shell's stiffness, modularity and required bearing surfaces.

In the last few years the Dutch, faced with increasing environmental problems, have appeared to be in the vanguard of an effort to put things….

In the last few years the Dutch, faced with increasing environmental problems, have appeared to be in the vanguard of an effort to put things to rights.

Now a catalogue of problems has appeared over the past 18 months, which, from a forensic investigation of the building, appear to be the result of serious defects in design and construction.

A growing interest for using optimization techniques in railroad problems has appeared in the operation research literature (see, e.g., Brannlund et al. ([1998]) and Cordeau et al. ([1998])).

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.