ABSTRACT
A fundamental notion in linear and nonlinear analysis, that of linear space over a field K https://s3-euw1-ap-pe-df-pch-content-public-p.s3.eu-west-1.amazonaws.com/9780203738146/a39b4fca-c030-4d1c-8f42-a97bddb7725a/content/dsk.tif"/> ( K https://s3-euw1-ap-pe-df-pch-content-public-p.s3.eu-west-1.amazonaws.com/9780203738146/a39b4fca-c030-4d1c-8f42-a97bddb7725a/content/dsk.tif"/> is ℝ or ℂ, the set of all real numbers or the set of all complex numbers, respectively) is considered in the following definition.
