How many strings of tekhelet per corner are to be used?
(a) According to Tosafot (and Rashi), of the four strings placed on a corner, two are to be blue and two are to be white (resulting in four blue and four white strings when the strings are folded through the corner hole). (b) According to the Rambam, of the four strings placed on a corner, only one half of one string is to be blue and the remaining three and a half strings are to be white (resulting in one blue and seven white strings when the strings are folded through the corner hole). (c) The Raavad takes issue with this and holds that of the four strings placed on a corner, one is to be blue and three are to be white (resulting in two blue and six white strings when the strings are folded through the corner hole). Now given that Tosafot demands two full strings of tekhelet, by putting on less (as per Rambam or Raavad), Tosafot would hold that one did not fulfill the mitzvah of tekhelet. On the other hand, the Rambam seems to be of the opinion that if there are non-white strings in
