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math.AG2009★ 1 cited
The ideal of relations for the ring of invariants of n points on the line: integrality results
Ben Howard, John Millson, Andrew Snowden +1
Consider the projective coordinate ring of the GIT quotient (P^1)^n//SL(2), with the usual linearization, where n is even. In 1894, Kempe proved that this ring is generated in degr…
math.AG2009
Universal covering spaces and fundamental groups in algebraic geometry as schemes
Ravi Vakil, Kirsten Wickelgren
In topology, the notions of the fundamental group and the universal cover are closely intertwined. By importing usual notions from topology into the algebraic and arithmetic settin…