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In an unbounded domain, Wolfersdorf [10] investigated the Tricomi problem for the Gellerstedt equation ( sign y ) | y | m u x x + u y y = 0, m > 0. Boundary value problems for the wave equation and equations of mixed type were investigated in [11].
The 5-year survival rates of advanced and early gastric cancer patients with mixed type were 40.8% and 83.5% respectively, which were lower than those with pure type (50.0% and 95.8%, P < 0.01).
Moreover, the Warburg type and the mixed type were classified into groups with a higher Ki-67 LI, whereas the reverse Warburg type and the null type were classified into groups with a lower Ki-67 LI (P < 0.001).
Three types of microarray data (time series, non-time series and mixed type) were used as benchmark datasets, and the performance of each algorithm was evaluated using three kinds of measures (NRMSE, CPP and BLCI) and the average of these measures (called the average index).
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Namely, equations of mixed type are those that have both retarded and advanced arguments.
As it is indicated in [34], further research on the oscillation of equations of mixed type is necessary as such equations arise in mathematical modeling, for example, in the growth of bacteria population with competitive species.
We point out that the studies made on boundary value problems for equations of mixed type, in domains with deviation from the characteristics (with a non-characteristic boundary), have originated with the fundamental works of Bitsadze [5], where the generalized Tricomi problem (Problem M) for an equation of mixed type is discussed.
Later, this mixed type was further crossbred with larger horses from Central Europe during the Middle Ages.
The mixed type was described as the combination of these two features.
Since mixed type was not a pure group, L-H status is not a good option for mixed type.
Some of the tumors, referred to as mixed type, are characterized by epithelial patterns and spindled mesenchymal cells.
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