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Apr 2, 2010 at 4:30 comment added Dev Sinha Yes, I am asking about this ring of diagonal invariants, but in positive characteristic, as well as diagonal invariants (so to speak) of GL_n acting on $k$ disjoint sets of size $n$, in positive characteristic.
Apr 1, 2010 at 21:48 history answered clarifythequestion CC BY-SA 2.5