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For $1\leq q \leq n-2$, we provide explicit examples to demonstratenon-compactness of the Neumann operator for the Kohn Laplacian acting on $L^2$$(0,q)$-forms on the unit ball in $(2n+1)$-dimensional Heisenberg space.

Non-compactness of the Neumann operator for the Kohn Laplacian on the Heisenberg ball