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A friend posted on Facebook the following question, and I couldn't solve it based on any context, so I thought I'd bring it here.
When the רא״ש refers to "הגאון", who is he referring to?
Is there someone he generally calls by that title?
From the Sefer Mei Ber Mayim Chaim chapter 4: pg 85 it seems that it is referring to Rav Hai Gaon.