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8.46 (1982)

Solved

Describe the automorphisms of the symplectic group $\text{Sp}_{2n}$ over an arbitrary commutative ring. Conjecture: they are all standard.

Contributor: Yu. I. Merzlyakov

Progress

The conjecture was proved (V. M. Petechuk, Algebra and Logic, 22 (1983), 397–405).

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