More Discussions for this daf
1. Ro'in and Lavud 2. A Korah which can hold an Ari'ach 3. Mechitzah she'Gedi'im Bok'in Bah
4. Korah As A Mechitzah When People Walk Under It 5. Tosfos DH v'ha'Ika 6. Size of a Korah
7. PI 3 vs 3.24 the GRA and RABBI MAX MUNK 8. מעגל
DAF DISCUSSIONS - ERUVIN 14

Dear Rav Kornfeld,

The gemara explains that the din of "Ro-in" applies only if the top korah is within 20 amos or the bottom korah is above 10 tfachim. But the meforshin explain (Suka 22b) that the distance between the two korahs must be less than three tfachim since we still need to connect them through the din of "Levud'. Yet, the gemara states that if you don't use the din of "Ro-in" then we cannot connect the two korahs.

Question: Why not ? Can't the din of "Lovud" connect the two korahs, without using the din of "Ro-in" ? Unless, the case we are referring to is the very narrow case whereby the lower korah is diagonally further than 3 tfachim away from the top korah, and therefore lovud can only apply if by raising through "Ro-in" straight vertically the lower korah and bring it next to the top korah the distance bewtween them will be less than three tfachim, and also if if by moving through "Ro-in" straight horizontally the lower korah and bring it right below the top korak, the distance betwen them would again be less than three tfachim. My conclusion is that only in such very narrow case we would need the din of "Ro-in" besides the din of "Lovud" to allow two narrow unleveled korahs to be usable.

Is that really correct ?

Thank you in advance for you response.