Does the entrance have to be usable all through Shabbat, or only at the start of Shabbat: Eruvin 17a, 70b, 78b, 93b
Ability of the residents abutting an area to merge, if one of the neighbors does not merge but does make a structural change ["Dakah"] at his entrance indicating he is not participating with them, at all: Eruvin 59b, 75a
Windows
The minimum size and height of a window, in order for it to be considered an entrance between properties: Eruvin 76a-b, 83b
Differentiating between a window which joins two houses, and a window which joins two yards: Eruvin 76b
Using a window from an upper floor, depending on the type of ladder leading to it: Eruvin 76b
Intervening Obstacles
How high a wall must be, to be considered an interruption: Eruvin 76b
How wide a gap may a wall have before the wall is considered nullified and the two previously-separated yards are considered one yard: Eruvin 76b, 87b, 92a
Status of a house which opens into a yard that enters an alley, but which does not have a direct entrance to that alley: Eruvin 73b
Using the space on top of a wall which separates two yards: Eruvin 76b-77b, 87b, 92a
How deep and wide a chasm must be, to be considered an interruption: Eruvin 78b, 83b
A storage unit holding straw: Eruvin 78b, 79a-b
Making use of straw held in a storage unit which is between two yards: Eruvin 79a
Status of adjacent yards where there is a drop of ten handbreadths from the ground level of one to the ground level of the other: Eruvin 93b
Means which would allow a person to scale walls between properties, and so annul the interruption
Cancelling out the interrupting effect of a wall by placing a ladder or platform alongside it: Eruvin 77b-78b
Cancelling out the interrupting effect of a wall by attaching platforms [Zizin] at some point along its height, with attached ladders: Eruvin 77b-78a
Does a ladder which is perfectly vertical cancel out the wall's status as an interruption: Eruvin 78a
Does a heavy object which is placed next to a wall, and is functional as a step-stool, cancel out the wall's status as an interruption: Eruvin 78a
What if the ladder running up a wall is too narrow to be considered a mitigation for the wall, and there are attached materials which could be used for handholds, albeit not for footholds: Eruvin 78a-b
How high up the footholds/handholds cut out of a wall must be, if one wants to consider them like a ladder: Eruvin 78b
Using a tree as a ladder: Eruvin 78b
Using wood from an Asheirah-idol for a ladder: Eruvin 78b
Means which would allow a person to traverse a chasm between properties
Materials covering the gap: Eruvin 78b, 79a
Materials filling the gap: Eruvin 78b-79a
Do the materials filling the gap have to be annulled to that spot, so that one does not intend to move them from the gap on Shabbat: Eruvin 78b-79a
The utlity of the entrance
Validity of an entrance which one is not allowed to use, by Jewish law: Eruvin 78b
Does the fact that a yard's neighbor [who has his own yard but who ordinarily passes through that yard] does not merge mean that those who actually live by that yard cannot successfully merge their properties [The issue of "Derisat Regel"]: Eruvin 48b-49a, 59b, 65b, 75a-b
Status of a residence which has another entrance that does not border the joint property, and which is easier to use than the entrance bordering the joint property: Eruvin 67a-b
What happens if there are two adjacent yards, arranged such that the residents of Yard A must pass through Yard B to reach a public area, and the residents of one or both of these yards do not make a merger for Shabbat: Eruvin 75a-b
Damaged entrances
What happens if the merger is arranged via a certain property's entrance into the jointly owned area, and that entrance becomes damaged during Shabbat: Eruvin 70b
What happens if yards are merged via a specific entrance between them, and then that entrance becomes sealed on Shabbat: Eruvin 17a, 93b
Other Issues
Does a ladder function as an entrance between properties, or as a wall: Eruvin 59b-60a