Example image of eyePlorer eyePlorer map for 'Occurrences of Grandi's series': Luigi Guido Grandi Supertask Thomson's lamp Zeno's paradoxes 1 − 2 + 3 − 4 + · · · Cauchy product Divergent geometric series Euler function Generating function Pentagonal number theorem Fourier series Hyperbolic function Joseph Fourier Dirac comb Dirichlet kernel Fejér kernel Poisson kernel Dirichlet series Analytic function Dirichlet eta function Riemann zeta function 1 + 1 + 1 + 1 + · · · CW complex Euler characteristic Meromorphic function Multiplicity (mathematics) Pole (complex analysis) Zero (complex analysis) Discrete geometry Jim Propp Real projective space Antipodal point Sphere Boson Casimir effect Eigenvalue, eigenvector and eigenspace Fermion Nucleon Regularization (physics) Spectral asymmetry Zeta function regularization