Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
436342 | Theoretical Computer Science | 2008 | 19 Pages |
Abstract
We define a new cost model for the call-by-value lambda-calculus satisfying the invariance thesis. That is, under the proposed cost model, Turing machines and the call-by-value lambda-calculus can simulate each other within a polynomial time overhead. The model only relies on combinatorial properties of the usual beta-reduction, without any reference to a specific machine or evaluator. In particular, the cost of a single beta reduction is proportional to the difference between the size of the redex and the size of the reduct. In this way, the total cost of normalizing a lambda term will take into account the size of all intermediate results (as well as the number of steps to normal form).
Related Topics
Physical Sciences and Engineering
Computer Science
Computational Theory and Mathematics