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Is a reshus a two-dimensional plane with separate airspace, or a three-dimensional cube where airspace is integral? The shiur analyzes the machlokes between Tosafos (תוספות) (reshus as cube) and Ramban (רמב"ן) (reshus requires ground contact) through the principle of kelutah kemishul kadamim. This fundamental chakira affects numerous hilchos Shabbos (שבת) regarding carrying and hanacha.
The shiur analyzes a complex sugya in Masechta Shabbos (שבת) regarding the fundamental nature of reshus domains and the principle of kelutah kemishul kadamim. The Gemara (גמרא) discusses whether al Har Sinai means 'on Mount Sinai' or 'above Mount Sinai,' leading to a broader question about the definition of reshus. Rabbi Zweig explores whether a reshus is a two-dimensional plane with separate airspace above it, or whether it constitutes a three-dimensional cubic area where airspace is integral to the reshus itself. This machlokes has profound implications for hilchos Shabbos. The shiur examines the dispute between the Yachid and Chachamim regarding kelutah kemishul kadamim - whether something in the airspace above ten tefachim is considered as if it descended to the ground level. According to one approach, the Yachid holds that airspace is part of the reshus (reshus as cube), while the Chachamim maintain that only the ground level constitutes the reshus proper, with airspace being separate.
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Shabbos 4a
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