... tng nghiờn cu l tớch chp suy rng, bt ng thc tớch chp suy rng, bin i tớch phõn kiu tớch chp suy rng i vi cỏc bin i tớch phõn Kontorovich-Lebedev, Fourier, Fourier sine, Fourier cosine v mt s ng ... Kontorovich-Lebedev, Fourier, Fourier sine, Fourier cosine v nhng nh lý, mnh cú liờn quan n Lun ỏn Chng xõy dng tớch chp suy rng mi i vi cỏc bin i tớch phõn Kontorovich-Lebedev, Fourier sine, Fourier cosine ... Tớch chp suy rng Kontorovich-Lebedev - Fourier sine - Fourier cosine nh ngha nh ngha 2.1.1 Tớch chp suy rng ca hai hm f, h i vi cỏc bin i tớch phõn Kontorovich-Lebedev, Fourier sine, v Fourier...