Study Guide Shabbat 4 Today's shiur is sponsored by Rebecca Schwarzmer in honor of her beloved grandmother Frances Rabitz Brauner, Fruma Malka bat Avraham v'Penina z"l. Why in our mishna are they obligating even if the space where the object is placed and also uprooted from is not 4x4 tefachim? Rabba suggests that the mishna is authored by Rabbi Akiva who does not need it to rest in a place that is 4x4 tefachim as Rabbi Akiva holds if one throws and object from a private domain to another private domain through the public domain, one is obligated since going through airspace is as if it rested there. From here one can say he does not hold that it needs to rest on a space of 4x4. Two questions are raised against this answer. Rav Yosef suggests the mishna is authored by Rebbi and the gemara tries to figure out which opinion of Rebbi is he referring to. They bring two suggestinos but each is rejected.