Timeline for What are the invariants of $U\otimes V\otimes W$ under action of $GL(U)\times GL(V) \times GL(W)$
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| Apr 16, 2014 at 21:07 | comment | added | Ben McKay | To provide a little more detail, any first order PDE system with constant coefficients can be represented as a tableau, and any tableau can be treated as such a PDE system. In particular, the characteristic variety of the PDE system is an invariant. I think I recall that that every real algebraic projective variety occurs as the characteristic variety of a tableau, but I am not sure. | |
| Apr 16, 2014 at 21:04 | history | answered | Ben McKay | CC BY-SA 3.0 |