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In mathematics, an algebraic expression is an expression build up from constants (usually, algebraic numbers) variables, and the basic algebraic operations: addition (+), subtraction (-), multiplication (×), division (÷), whole number powers, and roots (fractional powers).
Moreover, if T has finite order, then one can choose in such a way that only finitely many of them are non-zero. Note that the infinite sum above is well-defined as a distribution. The value of T for a given f ∈ D ( U ) {\displaystyle f\in {\mathcal {D}}(U)} can be computed using the finitely many g α {\displaystyle g_{\alpha }} that ...