DaasYochid: You re right in pointing out that the Rambam holds that building would be a d’oraisa-unlike the tosofes. However, this may be because- as I see it- the Rambam dos NOT hold “mitoch” on any other melocho, except “hotzaah and havoro”. see mishne 4. Actually, the more I read about this, the more interesting the subject becomes. By the ay, I never said that one can actually build house on yom tov- see tosefos. However, it may have applications as far as electric currents.
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