functionals
Synonyms
Examples
A dual description is provided with linear functionals (usually implemented as linear equations ).
In Banach spaces, a large part of the study involves the dual space : the space of all continuous linear maps from the space into its underlying field, so-called functionals.
Let X be a normed topological vector space over F, compatible with the absolute value in F. Then in X*, the topological dual space X of continuous F-valued linear functionals on X, all norm-closed balls are compact in the weak-* topology.
Indeed, it coincides with the topology of pointwise convergence of linear functionals.
Standard functions act by integration against a test function, but many other linear functionals do not arise in this way, and these are the "generalized functions".
The bra linear functionals are defined to be consistent with the inner product.