May one extend a mat (matzelet) over pre-existing tent-supports (arched slats) on a boat on Shabbat?
Synopsis
When boat arches form a minimum-measure ohel before Shabbat (one arch is tefach wide, or arches are within 3 tefachim of each other via lavud), one may spread a mat over them on Shabbat as a permitted addition to an existing temporary ohel.
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Discussion
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