Responsa for Eruvin 176:8

ומאי דוחקיה דר' זירא לאוקמה למתני' כר"א בן יעקב אמר רבא מתניתין קשיתיה מאי איריא דתני חצר שהיא פחותה ליתני חצר שאין בה ד' אמות על ד' אמות

whereas our Mishnah<span class="x" onmousemove="('comment',' Which forbade the pouring of water only where the area WAS LESS THAN FOUR CUBITS and, inferentially, permitted it where it was four cubits or bigger irrespective of the relative lengths of its sides.');">¹⁸</span> is that of R'Eliezer B'Jacob.<span class="x" onmousemove="('comment',' Who, in his ruling on the drain in our Mishnah, recognizes the principle of capacity for absorption.');">¹⁹</span> What, however, was it that urged R'Zera to attribute our Mishnah<span class="x" onmousemove="('comment',' Which is anonymous and presumably represents the view of a majority.');">²⁰</span>

Teshuvot Maharam