Example image of eyePlorer eyePlorer map for 'Bump function': Euclidean space Mathematics Smooth function Distribution (mathematics) Dual space Non-analytic smooth function Gaussian function Open set Indicator function Convolution Mollifier Analytic function Identity theorem Partition of unity Differential operator Paley–Wiener theorem Schwartz space Holomorphic functions are analytic Peetre theorem Stationary phase approximation Support (mathematics) Stalk (sheaf) Bump Dirac delta function