When is a Riesz distribution a complex measure?
When is a trigonometric polynomial not a trigonometric polynomial?
When physics helps mathematics: calculation of the sophisticated multiple integral
Where the Buffalo Roam: Infinite Processes and Infinite Complexity
Whitney's Theorem for oscillatiing on $R$ functions
Wiener's 'closure of translates' problem and Piatetski-Shapiro's uniqueness phenomenon
Wiener-Wintner for Hilbert Transform
Wilson function transforms related to Racah coefficients
Wiman and Arima theorems for quasiregular mappings
Winding numbers and Fourier series
Wolff's inequality for hypersurfaces