A declaration is the mathematical definition of a set of variables. It is the lowest level building block for a model in `assemblerr`. A declaration consists of the variable names being declared (the identifiers) and their definition. The `declaration` function allows the specification of a declaration using `R` formulae.
declaration(...)
... | List of R formulae with a single symbol on the left-hand side and a valid R expression on the right |
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A declaration vector