Ciro Santilli
πŸ”—

Riesz-Fischer theorem | πŸ—– nosplit | ↑ parent "Lebesgue integral of is complete but Riemann isn't" | 56, 4, 287

πŸ”—
A measurable function defined on a closed interval is square integrable (and therefore in ) if and only if Fourier series converges in norm the function:
πŸ”—
πŸ”—