I am of the opinion that the definitions of various terms used in tabla have no logic. I have read definitions given by Arvind Mulgaonkar,Sudhir Mainkar,Abban Mistry, Sadanand Nayampalli,Madanlal Joshi.etc. As an engineer I feel that any definition must stand the scrutiny of the compositions. My  comments and explanation on difference between rav and rela will stand to scrutiny. But the explanations by other erudite scholars does not. So I am going to discuss these in my future blogs.