Example image of eyePlorer eyePlorer map for 'Functional equation': Equation Mathematics Riemann zeta function Gamma function Leonhard Euler Reflection formula Integer Modular form Unitary matrix Exponential function Logarithm Cauchy's functional equation Parallelogram law Abel equation Recurrence relation Translation operator Dragoslav Mitrinović Functional equation (L-function) Quasiperiodic function Riemann Xi function Schröder's equation Stanley's reciprocity theorem Dedekind sum EqWorld Hilbert modular form Hiroshi Haruki János Aczél (mathematician) Traian Lalescu Hypertranscendental function Legendre transformation Residual (numerical analysis) Functional square root Mahmut Bajraktarević Weil conjectures Pierre Deligne Rayleigh's method of dimensional analysis Barnes G-function Dedekind eta function Dirichlet eta function Jacques Touchard Non-analytic smooth function Addition theorem Automorphic form 1 − 2 + 3 − 4 + · · · Hurwitz zeta function Mathematical psychology Analytic continuation Bernstein–Sato polynomial Li's criterion Mark Krasnosel'skii