Absolute convergence of orthogonal series -- Absolute Nรถrlund summability almost everywhere of fourier series -- Absolute Nรถrlund summability almost everywhere of orthogonal series -- Absolute Riesz summability almost everywhere of orthogonal series -- Absolute Nรถrlund summability factors of fourier series -- Absolute Nรถrlund summability factors of conjugate series of fourier series -- Local property of absolute Riesz summability of fourier series -- Local property of absolute Nรถrlund summability of fourier series