Also there exist difficulties in practice when it comes to measuring absolute levels of miRNA, the lack of standardized protocols, and variations in test performance depending on the laboratory and heparin in the sample represents a significant inhibitor of reactions based on PCR method.
In Algorithms 3.1 and 3.2, there still exists difficulty to implement the projections P C and P Q with respect to the defined norms, especially when C and Q are general closed convex sets.
In their proof of Theorem 3, the authors did not consider the positive and negative of the parameter γ and so there exists the same difficulty in the following proof of their paper.
However, due to the complexity of the network structure and the rapid change of social network platforms, for studying information spreading on online social networks there exist many difficulties.
The problem tackled in this paper is a practical one encountered in the extrusion industry where for the production of sections whose dimensions are larger than the container or billet diameter there exist some difficulties and sometime it is impossible to produce such products.
But there exists a difficulty: how to set the membership function in each particular case.
