There's a linear algebra proof by Harm Derksen: http://www.jstor.org/pss/3647746https://www.jstor.org/stable/3647746. You can also find the article posted here: http://math.berkeley.edu/~ribet/110/f03/derksen.pdfhttps://math.berkeley.edu/~ribet/110/f03/derksen.pdf
The Amplitwist
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