For diagonal state space models, parity cannot be solved by combining input-dependent non-negative layers (Mamba) with input-independent negative-eigenvalue layers (S4D); a single layer needs both properties.
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Parity Requires Unified Input Dependence and Negative Eigenvalues in SSMs
For diagonal state space models, parity cannot be solved by combining input-dependent non-negative layers (Mamba) with input-independent negative-eigenvalue layers (S4D); a single layer needs both properties.