Create a vector object. Each process owns some unique consecutive range of vector unknowns, indicated by the global indices jlower and jupper. The data is required to be such that the value of jlower on any process $p$ be exactly one more than the value of jupper on process $p-1$. Note that the first index of the global vector may start with any integer value. In particular, one may use zero- or one-based indexing.alphabetic index hierarchy of classesCollective.
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