An alley is longer than it is wide; otherwise, the space is termed a yard: Eruvin 5a, 12b
Requiring two adjoining houses and two adjoining yards, as well as a Tzurat haPetach, in order to permit carrying through an alley: Shabbat 130b-131a; Eruvin 5a, 12b, 73b-75a
Minimum width of an alley, to require certain structural additions in order to permit transportation within the alley: Eruvin 3b, 5a, 10a, 11b-12a
Biblical Status of an alley which is not fully enclosed - is it semi-private or public: Eruvin 12b
Status of an alley which does not have openings into a public area at both ends: Eruvin 12b
Status of an alley which has its surface at a different height from that of the adjoining areas, at a difference of ten Tefach [Hand-Breadths] within a length of four Ammot [Cubits]: Shabbat 100a
Status of multiple adjacent yards, which border an alley, and which did not merge with each other: Eruvin 91b
Gaps in the Walls
The maximum acceptable gap in a side-wall: Eruvin 5b, 6a
The maximum acceptable gap in sections of wall which flank the entrance opening, along its wall: Eruvin 6a
What happens if there is a gap in one of the walls of the alley, near its entrance: Eruvin 5a
Differentiating between gaps through which people pass [Baki Bah Rabim], and those through which people don't pass: Eruvin 6a
Differentiating between gaps which have fragments of the wall obstructing passage, and those which don't: Eruvin 6a
Defining a "Tzurat haPetach" - the form of a Doorway, used as part of converting an alley into a private property
Whether the literal definition of a "Tzurat haPetach" is a post on either side, with a beam across the top: Eruvin 11b
Requiring a Lechi and a Korah, or one of the two, or more than one Lechi, in order to make a Tzurat haPetach: Shabbat 117a-b; Eruvin 2b, 11b-12a, 14b, 39b
What happens if something damages the Tzurat haPetach during Shabbat: Eruvin 70b, 94a-95a
A Tzurat haPetach with doors which have a lot of open space in them: Eruvin 11a, 16b
Whether a Tzurat haPetach must be strong enough to hold a door of minimal weight: Eruvin 11b
Whether a Tzurat haPetach must have the structure to hold a door-hinge [Heker Tzir]: Eruvin 11b
Maximum height of an alley's entrance, to allow the creation of a Tzurat haPetach to enable carrying within: Succah 2a; Eruvin 2a-3b, 10b-11a
Maximum width of an alley's entrance, to allow the creation of a Tzurat haPetach to enable carrying within: Succah 2a; Eruvin 2a-3b, 10a-b, 10b-11a
How wide a space of the floor beneath the entrance must be less than the maximum distance from the top, to allow carrying with a Tzurat haPetach: Eruvin 4b-5a
How wide a space of the floor beneath the entrance must be more than the minimum distance from the top, to allow carrying with a Tzurat haPetach: Eruvin 5a
Requiring an extra-wide elevated space beneath the entrance, lest someone inadvertantly erode some of it [Gezeirah Shema Yifchot]: Eruvin 5a
The size of the cubit employed for measurement of an alley's entrance: Eruvin 3b
The sources for the maximum size measurements of the alley's entrance are the dimensions of the entrance to the "Heichal" room of the Temple or the "Ulam [Azarah]" room of the Temple: Eruvin 2a-3a
A Tzurat haPetach which is placed not at the entrance of an alley, but at some point within the alley: Eruvin 14b
Forcing a resident to make the structural emendations needed at the entrance of an alley in order to permit merging of the properties abutting the alley: Eruvin 80a-b
Specifics of a Lechi - A Vertical beam of a Tzurat haPetach
Purpose of a Lechi - to be recognizable or to function as a dividing mark: Eruvin 12b, 15a
Minimum height of a Lechi: Eruvin 14b
Minimum width of a Lechi: Eruvin 14b [2x]
Using a living creature as a Lechi: Eruvin 15a, 15b; Succah 23a
A Lechi which does not reach the ground: Eruvin 14b
Whether the Lechi must reach the Korah: Eruvin 11b
Validity of a Lechi which was erected for some purpose other than creating a Tzurat haPetach for the alley [Lechi haOmeid meiEilav]: Eruvin 15a
Validity of a Lechi which is separate from the alley's wall, but within four cubits of it: Eruvin 5a-b, 14b
Putting up an extra Lechi along with a Lechi which is too far away from the alley's wall: Eruvin 5a-b
Putting up a Lechi at the entrance if there are other Lechi-arrangements inside the alley: Eruvin 9a-b
Validity of a Lechi which is visible as a Lechi externally, but not inside the alley: Eruvin 9b-10a, 15a
Using a mat, staked to the wall or not: Eruvin 8a
Validity of a Lechi which is put up at an entrance which is used less than another gap in the wall: Eruvin 10b
Using uneven stones which jut out of the end of a wall: Eruvin 15a
Using wood from an Asheirah-idol for a Lechi: Eruvin 80b
Specifics of a Korah - The Crossbeam of a Tzurat haPetach
Purpose of having a Korah - to be recognizable or to function as a dividing mark: Eruvin 3a, 5a, 8b [2x], 12b
The appropriate width of the Korah: Succah 22b; Eruvin 3a, 13b-14a, 14a
The appropriate strength of the Korah: Eruvin 13b-14a, 14a
Validity of dual Korot, where both combined may support the minimum required weight: Eruvin 14a
The appropriate strength of the Korah's support pegs: Eruvin 14a
A Korah which is not strong, but is very wide or otherwise very noticeable [Amaltera]: Eruvin 2b-3a, 10b-11a
A curved Korah: Eruvin 13b, 14a
A Korah which is very light: Eruvin 3a
A Korah which is covered: Eruvin 14a
Where the Korah doesn't reach the other side of an alley's entrance: Eruvin 14a; Succah 18a, 22a
Considering a Korah to be attached to an alley's walls even if it is somewhat distant from those walls: Eruvin 8b-9a, 14a
A Korah which is connected to the side, rather than the top, of the Tzurat haPetach [Min haTzad]: Eruvin 11a-b
Validity of Two Korot, one extending from one side and the other from the other side, where the two do not touch each other: Eruvin 14a
Validity of two Korot, where they are vertically distant from each other: Eruvin 14a
Validity of a Korah which is supported by pegs attached to the external end of the walls, such that the Korah begins where the walls end: Eruvin 8b-9a
How to set up a Korah where one of the alley's walls extends well past the other: Eruvin 8b
Validating a Korah which is actually made of multiple layers, staggered to cover different spaces: Succah 22a-b
A Korah which is partially above, and partially below, the maximum or minimum height: Eruvin 3a, 14a
Using the "Lavud" principle to pretend that part of a Korah, which juts out, is within the appropriate area: Eruvin 14a
A Korah which is partially in, and partially out of, the alley: Eruvin 14a
The Type of Alley which may benefit from a Tzurat haPetach
Power of a Tzurat haPetach at an alley's entrance to allow a person within the alley to transport items: Eruvin 2b
How many walls an alley must have, to permit transport when a Tzurat haPetach is present: Shabbat 117a-b; Eruvin 11b
Requiring two adjoining houses and two adjoining yards, as well as a Tzurat haPetach, in order to permit carrying through an alley: Shabbat 130b-131a; Eruvin 5a, 66b, 73b-74b
Using a Tzurat haPetach for a vacant, abandoned area which is fit for someone to enter and establish residence therein: Eruvin 73b-74a
Dealing with an alley which is curved, with both ends opening into a public area: Eruvin 6a, 8a
Whether it is possible, with a Tzurat haPetach or with doors, to permit carrying in an alley which opens on a public area [Mefulash] at both ends: Shabbat 117a-b; Eruvin 6a-b, 12b
Handling an alley which opens on a public area at one end, and a Karmelit at the other: Eruvin 7a
Handling an alley which opens on a public area at one end, and a private area with its own entrance to a public area at the other: Eruvin 7a-8a; 99b
Status of a yard which borders on an alley, and has a gap in the wall which ordinarily separates the yard and the alley: Eruvin 7b-8b
Handling an alley which has many alleys opening off of it towards public areas, "like a centipede": Eruvin 8b
Establishing more stringent requirements for entrances which are dilapidated: Eruvin 11a
Use of an alley enclosed by a Tzurat haPetach
Is one allowed to use the space directly beneath the Tzurat haPetach [between the Lechi posts or beneath the Korah]: Eruvin 4b-5a, 8b-9b, 10a
