The inner product on the Hilbert unit ball requires k exponential in 1/ε for (k,ε)-stability, with bounds exp(π/ε) upper and exp(log 2/ε) lower, and similar exponential scaling for nonlinear powers.
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A note on quantitative stability in Hilbert spaces
The inner product on the Hilbert unit ball requires k exponential in 1/ε for (k,ε)-stability, with bounds exp(π/ε) upper and exp(log 2/ε) lower, and similar exponential scaling for nonlinear powers.