There are some situations in which we want to include known restrictions about x(t). x(t) is always positive x(t) is always increasing (or decreasing) x(t) is a density Idea: Enforce these conditions by transforming x(t).
CITATION STYLE
Constrained functions. (2006). In Functional Data Analysis (pp. 111–126). Springer-Verlag. https://doi.org/10.1007/0-387-22751-2_6
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