Pictures Today's daf is dedicated by Gitta and David Neufeld as a zechut for our dear friend and mentor, Chaya bat Osna Rachel, a fierce advocate for Jewish education, בתוך שאר חולי ישראל. We are blessed by her friendship and leadership. One can be lenient with mistakes in measurements regarding techum since alws of techum are rabbinic. Also one can accept testimony of people whose testimony regarding the location of the techum is not usually accepted. The mishna moves into issues of eruv for carrying purposes. They distinguish between a city that was an individual (what exactly does that mean) and became public and a city that was the reverse. In what cases and how can one make an eruv? Does one need to leave a section out of the eruv? Can the city be split? If so, how?