Summability of Fourier series
3.1. Toeplitz matrices. Abel and Cesaro means.
3.2. Fejér's theorem.
3.3 Summability (C, r) of Fourier series and conjugate series.
3.4. Abel's summability.
3.5. The Cesaro summation of differentiated series.
3.6. Fourier sine series.
3.7. Convergence factors.
3.8. Summability of Fourier-Stieltjes series.
3.9. Miscellaneous theorems and examples.