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The algebra structure of linear functionals on polynomials of a single variable (Roman 1984, pp. 2-3).

An operator T which maps some basic polynomial sequence p_n(x) into another basic polynomial sequence q_n(x).

A unar is an algebra A=(A,f), where f is a single unary operation.

In set theory, a unary operation on set A is a function A->A. More generally, a unary operation is a function with exactly one operand, such as the factorial, square root, or ...

1 uncia=1/(12). The word uncia was Latin for a unit equal to 1/12 of another unit called the as. The words "inch" (1/12 of a foot) and "ounce" (originally 1/12 of a pound and ...

An infinite set, such as the real numbers, which is not countably infinite.

An undecahedron is a polyhedron having 11 faces. Examples include those illustrated above and summarized in the following table. F E V name 11 8 17 biaugmented triangular ...

Not decidable as a result of being neither formally provable nor unprovable.

An expression in mathematics which does not have meaning and so which is not assigned an interpretation. For example, division by zero is undefined in the field of real ...

A dot placed under a symbol to indicate a dummy variable, e.g., c_._1 (Comtet 1974, p. 32). This notation, however, is not very common.