Non-deterministic Characterisations
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In this paper, we extend Jones' result -- that cons-free programming with k^th-order data and a call-by-value strategy characterises EXP^kTIME -- to a more general setting, including pattern-matching and non-deterministic choice. We show that the addition of non-determinism is unexpectedly powerful in the higher-order setting. Nevertheless, we can obtain a non-deterministic parallel to Jones' hierarchy result by appropriate restricting rule formation.
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