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We give an new, elementary proof of the result that the smallest non-cyclicquotients of automorphism group of free group is the linear group over thefield of two elements, and moreover all minimal quotients are obtained by thestandard projection composed with an automorphism of the image. This result,originally due to Baumeister-Kielak-Pierro, proves a conjecture ofMecchia-Zimmermann.

Smallest non-cyclic quotients of the automorphism group of free groups