Eruvin 74: The Solitary Home of Ivut bar Ihi

In the context of the alleyway cooperative and the courtyard cooperative, and the minimum requirements for the number of people participating: is one house on one courtyard on one alleyway really enough to merit an eruv? Shmuel seems to have said yes (he confirms that he said as much!). And R. Eliezer can't believe it. But when he confronts Shmuel, Shmuel is silent, in response. Which leaves us guessing what he meant. A proof case seems to have been found in the form of Ivut bar Ihi and his housing. Though an alternative explanation is found, instead.