\begin{definition}[Definition:Ritz Sequence]
Let $\sequence {\phi_n}$ be an infinite sequence of mappings in a normed linear space, where:
:$\phi_n: \R \to \R$
Let this sequence be constrained by the requirements defined in the definition of the Ritz method.
{{explain|Specify what these are. For ultimate reusability, consider extracting those requirements into an appropriately-named and transcluded subpage of the above.}}
Then the sequence $\set {\phi_n}$ can be called a '''Ritz Sequence'''.
\end{definition}