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Answer: That is an excellent question, as many people think an eiruv is only the tzurot hapesach (posts and connecting cord) that complete an area’s halachic walls. The physical walls do create a reshut hayachid (private domain, where it is permitted to carry) of what otherwise would have been a reshut harabim (public domain, where it is forbidden to carry), either based on Torah law or, more likely Rabbinically (karmelit). However, Shlomo Hamelech instituted a prohibition on carrying from a domain belonging to one person/group to a domain belonging to another (Eiruvin 21b) unless they placed an eiruv chatzeirot. The reason for the prohibition is that if people are accustomed to moving from domain to domain without thought, they may carry from a reshut hayachid to a reshut harabim (Rashi ad loc.).
Bemare Habazak - Rabbis Questions (654)
Rabbi Daniel Mann
535 - Building a Sukka on Public Property
536 - Eiruv Chatzeirot at a Hospital
537 - Ask the Rabbi: Dissolving Colored Pill in Contact Lens Solution on Shabbat
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The hospital is presumably owned by one entity, and it does not make a difference if it is publicly or privately owned, and if privately, if by an organization, corporation, family, or individual. The important thing is that it is not that different rooms are owned by different entities. The question is whether when the hospital gives living rights to patients, who usually pay (directly or through medical coverage on their behalf), this creates new entities who jointly occupy the facility. In fact, if a lone owner of an apartment building rents out apartments (for 30 days – ibid. 370:8), the building likely requires an eiruv chatzeirot (e.g., if it has multiple Jewish tenants and is not included in a larger eiruv).
A few factors cause the usage of part of an area by other entities to not be considered, in our context, the owner ceding his control over those areas. One is if the owner can move a sub-area’s residents from one place to another (see Minchat Yitzchak IV:55; Be’ur Halacha to 370:3). In our case, even if the hospital cannot remove a patient from the hospital, he can move him from room to room, which might be enough to allow carrying because no room "belongs" to him.
Another factor that might help is tefisat yad, i.e., the owner retains usage of the room he gave to another, by means of keeping there an object of his that cannot be readily moved from the room on Shabbat due to size or muktzeh status (Shulchan Aruch, 370:2). This might apply to some of the furniture or medical equipment in the room (see Igrot Moshe, OC I:141). On the other hand, some argue that furniture in a furnished rental is not tefisat yad, as it is part of the rental (see Shemirat Shabbat K’hilchata 17:(58)). Application of this idea to hospital settings can be complex.
Another unifying factor is if all the units share a service (e.g., fed from one kitchen, laundry service), although this may not be a sufficient leniency on its own (see Shulchan Aruch, OC 370:4 and Mishna Berura 370:33).
By applying the above principles, one can presume that he can carry from a room to the halls and other rooms in a hospital (see Netivot Shabbat 34:13; Eiruvin 46a). A hospital chaplain can look into its specific setup and act to remove all doubt if there is some need or to placate the overly nervous.
Lessons
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Kuzari -Rabbi Ari Shvat Kuzari class 9 - "Seeing is Believing" (parag. 21-30)
These paragraphs elaborate on the theme that seeing and knowing is better than any attempt to prove logically, and begins explaining the difference between Israel and gentiles.

Ein Aya Various Universal Stages of the Geula Process
Rav Kook examines the various stages of redemption, explaining how (in addition to the obvious oft-mentioned stages of ingathering the exiles, reviving the Hebrew language, army, state etc.) the messianic dream of world prosperity, the State of Israel and world unity can and are realistically and logically gradually coming true.

Kuzari -Rabbi Ari Shvat Kuzari class 8- "Answering Questions on the Kuzari's Proof from Mass Revelation
How do we know that the "claim" of mass revelation to 2,000,000 witnesses at Mt. Sinai is really true? This important class answers all of the questions skeptics ask about this claim of the Kuzari.

Ein Aya Armies Still Necessary for Balance & the War Against Wars
Rav Kook explains why the world was originally divided into the various seemingly contradicting ideologies and cultures, in order to develop each one respectively. Swords or armies symbolize how each respective ideology defends themselves, as well as deters their opposing ideologies and cultures. On the other hand, the messianic era will be one of peace, and Rav Kook explains the transition to that stage, which mankind is already undergoing.

The Land of Israel LGBT'S IN ISRAEL
The question was asked, how can one make Aliyah with the LGBT parades?

Kuzari -Rabbi Ari Shvat Kuzari class 7 - Five Accumulative Proofs of G-d
As a preparation for the Kuzari's classic proof of G-d from the mass-revelation at Sinai, we start here with 5 other directions to strengthen our belief which also contribute to what the Kuzari will present as well.

Ein Aya Muscle & Meaning: The Dual Nature of Gevurah (Physical Strength)
Is physical strength and fitness a necessity or an ideal? Although it if often totally overlooked among topics of Judaism, Rav Kook writes that it clearly is also a necessity to deter the many enemies of Israel, but even in Y'mot HaMashiach, in the Messianic era, to a certain extent, it's ideal continues even after our enemies will have been finished off.








