On the Laws of Mixture (Borer)
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Question
Hello, Is a stack of Gemaras from the same tractate, but each Gemara belongs to a different person (when their names are not written on the outside and they are indistinguishable), considered a mixture because they are Gemaras belonging to different people and have significant differences such as summaries and the like of the owner of the Gemara, or notes on the page itself? Or, since the main name of the book is determined by the name of the tractate of the Gemara, is it not considered a mixture at all, and it would be permissible to select even not immediately before use, etc.? (Also, are different editions of the Gemara or the Siddur and the like considered a mixture, or is their essence the same?) Thank you very much for the response!
Answer
Hello
This is not considered borer because it is regarded as one type.
Source
Shulchan Aruch, Orach Chaim, Siman 319