Definitions for "Basis function"
A mathematical function that can be used to build a description of wavefunctions for electrons in atoms or molecules.
A function used to describe the variation of a variable (such as pressure or concentration) between nodes in a finite-element discretization. SUTRA uses bilinear basis functions in 2D and trilinear basis functions in 3D. SUTRA basis functions vary linearly along element edges (straight lines that connect neighboring nodes). See Sections 3.2 and 4.1 of the SUTRA documentation for details.
an elementary function of time that is defined over all time