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math.RT2019
Invariant theory and wheeled PROPs
Harm Derksen, Visu Makam
We study the category of wheeled PROPs using tools from Invariant Theory. A typical example of a wheeled PROP is the mixed tensor algebra , whe…
math.RT2019
The capacity of quiver representations and Brascamp-Lieb constants
Calin Chindris, Harm Derksen
Let be a bipartite quiver, a real representation of , and an integral weight of orthogonal to the dimension vector of . Guided by quiver invariant theoretic c…
math.RT2019
An exponential lower bound for the degrees of invariants of cubic forms and tensor actions
Harm Derksen, Visu Makam
Using the Grosshans Principle, we develop a method for proving lower bounds for the maximal degree of a system of generators of an invariant ring. This method also gives lower boun…