Abstract
By solving certain partial differential equations, we find the explicit decomposition of the polynomial algebra over the 56-dimensional basic irreducible module of the simple Lie algebra E 7 into a sum of irreducible submodules. This essentially gives a partial differential equation proof of a combinatorial identity on the dimensions of certain irreducible modules of E 7. We also determine two three-parameter families of irreducible submodules in the solution space of Cartan’s well-known fourth-order E 7-invariant partial differential equation.
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