Here, more formally, we can take the symmetric powers of ρ to describe F. When K has characteristic 0 this was well known; the question was the extension to prime characteristic p. The conjecture was proved in 1975 by W. J. Haboush, about a decade after the problem had been posed by David Mumford.
It is of interest in relation with Mumford's geometric invariant theory, as well as some questions arising in classical parts of invariant theory. These with its help can be shown not to depend in an essential way on the characteristic of K.
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